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Serial Converters, Repeaters and Suppressors

To keep your serial equipment communicating and smoothly integrated with new technologies, B B SmartWorx powered by Advantech has developed the most extensive line of serial conversion and isolation products on the market. Built tough to handle the most demanding environments, our serial products are rugged and reliable.

Product Categories

  • Data Taps, Splitters, Combiners, Switches, Line Boosters

    Whether you need serial data taps, testers, port splitters, line boosters or port combiners, these simpler technology tools can help you complete your communications system.

    • BB-9PMTT

      Which RS-232 data lines are active? Find out with this RS-232 mini tester. It makes troubleshooting easy by helping to check interface connections, equipment, cable problems or failures. Model 9PMTT RS-232 mini tester is designed to connect with any RS-232 interface. The tester may be left in the line permanently. It is transparent to data transfer. Bright red or green LED signals clearly show which lines are active. The LEDs’ color indicates Negative or Positive voltage (red meaning Negative; green meaning Positive).
    • BB-232PTC9

      Monitor and control multiple scales, scanners, terminals or other serial devices with a single PC. Economizes systems by connecting a PC port to several data sources – ideal for devices requiring only intermittent access. The first device to send captures the data path, locking out other lines. Data flow may also be software controlled using the RTS line. Data from the host PC is sent to all attached devices. Port combiners can be cascaded by connecting the master port of each successive unit to one of the slave ports of the preceding unit. Each additional port combiner adds one slave port to the system. Model 232PTC9 requires an external 12 VDC @ 100 mA power supply (sold separately).
    • BB-232MDS

      Model 232MDS can be connected so two computers or terminals can use one modem without switching. This modem data splitter can combine two 25-pin DTE ports and connect them to a 25-pin DCE port. With B B SmartWorx’ serial port splitter you gain reliability by capturing data from one peripheral on redundant PCs. This serial RS-232 splitter can improve a system’s economy by sharing multiple PCs on a single peripheral.
    • BB-9PMDS

      Model 9PMDS connects two computers or terminals to one modem without switching. The splitter can combine two 9-pin DTE ports to one 9-pin DCE port. With B B SmartWorx’ serial port splitter you gain reliability by capturing data from one peripheral on redundant PCs. This serial RS-232 splitter can improve a system’s economy by sharing multiple PCs on a single peripheral.
    • BB-232LB9R

      The 232LB9R is a 9-pin RS-232 repeater that re-transmits all 8 signals and carries the ground line through. Many computers, laptops and some desktops ship with low-power versions of RS-232 ports that are unable to drive port-powered devices or full-length RS-232 cabling. The 232LB9R can amplify these weak signals up to the RS-232 Standard for uses such as running port powered devices. It is also ideal for extending full-powered RS-232 cable runs beyond the typical 15 to 30 meters (50 to 100 feet) distance. An external power supply is required (sold separately).
    • BB-232DRIO

      Model 232DRIO provides a low-cost, easy to use solution for RS-232 serial port to discrete relay output applications. It offers one optically isolated input and two relay outputs. The General Purpose Control Module can be used to sense external ON/OFF conditions and to control a variety of devices. The 232DRIO includes a CD ROM with an instruction manual and demonstration programs written in QuickBASIC and C/C .
    • BB-232BSS4

      Intelligent and versatile, Model 232BSS4 serial data switch provides communication to four devices from one serial port. Each port contains a dedicated UART and an 8K byte Transmit and Receive buffer, allowing each port’s data rate, data format, and protocol to be configured independently. The Master port can send and receive data from one Slave port while the other Slave ports continue to buffer data. The Master can also broadcast the same message to two or more Slave ports at once. The switch can also be configured to send data automatically to the Master port from each of the Slave ports when data is present with an optional preamble identifying the port. It can also provide two-way communications between the Master port and one Slave port at a time. Switching and control is accomplished through user defined three or four character command strings. These control sequences are stripped from the data stream, making the switch transparent to the Slave devices. Switches can be cascaded to expand the 232BSS4 to more than four ports. Two units can also be used back-to-back to provide automatic connection between devices over a single data channel. LEDs indicate when the unit is powered up and which port is selected to send data to the Master port. Setup software is provided on the included CD and is compatible with Windows 98, ME, 2000, XP, and Vista. A 12VDC power supply with a 2.5mm (positive tip) phone jack is required (sold separately). The Master port is a DB25 female connector configured as DCE. This provides a direct connection to an IBM PC compatible or other DTE device. When connecting the Master port to a modem, the Master port of another 232BSS4, or other device configured as DCE, a null modem adapter is required. Slave ports are DB9 male connectors configured as DTE for direct connection to a modem or other DCE device. When connecting the Slave ports to a PC compatible or other DTE device, a null modem adapter is required. Data Format: 7 or 8 Data bits, Even, Odd, or No Parity (Master does not support 7 Data bits with no parity), 1 Stop bit (fixed).
    • BB-9PCDT

      Tap in on a serial data stream and transparently feed another monitor, printer or other device. Model 9PCDT allows an RS-232 port to tap into and check data being transmitted between two other RS-232 ports. DIP switches set programming to monitor the main Transmit and Receive lines individually or together. Choose between monitoring the DCE or DTE port. Also allows the monitoring port to be either DTE or DCE. The DTE connector is male, and DCE and TAP connectors are female.
    • BB-232CDT

      Tap in on a serial data stream and transparently feed another monitor, printer or other device. Model 232CDT has DIP switches that allow you to monitor the main Transmit and Receive lines individually or together. The male RS-232 connector on the top and the female RS-232 connector on the bottom are connected straight through, pin for pin. These connectors are used to connect the device – in series – with the RS-232 line to be tapped.
  • PCI Serial Port Cards

    Device connectivity is made easy and reliable with PCI serial port cards. Control or access data with fast, cost-effective communications from a variety of serial devices. PCI serial cards are ideal for industrial and time-sensitive applications including automotive diagnostics, HVAC, point-of-sale, court reporting, security and SCADA.

    • BB-DSCLP-100

      As many banking, retail, and hospitality POS applications are implemented using increasingly smaller-size systems, it becomes more difficult to integrate the multiple serial ports necessary to accommodate the large number of peripherals required for these systems. This low profile PCI serial board solves this problem. Low profile PCI boards are mechanically similar to standard PCI boards, but use a shorter board and a different mounting bracket. This product leverages the standard to provide two additional serial ports on a single board. These low profile PCI boards adhere strictly to standard specifications, so you can be sure that every board will install smoothly and consistently, and function properly in your system.
    • BB-3PCIU4

      Model 3PCIU4, universal PCI card, is suitable for many applications including industrial monitoring and control, SCADA, point-of-sale, medical and security. Outputs are independently configurable for RS-232, RS-422, or RS-485. DB9 male connectors offer positive thumbscrew locking - more robust than phone jack connectors. This four-port card includes fan-out cables. The card supports data rates up to 460.8 kbps, is plug-and-play compatible and has adjustable FIFO trigger thresholds for input and output. RS-485 operation supports both 2-wire and 4-wire (full and half-duplex) and Automatic Send Data Control. A comprehensive technical manual and CD ROM with drivers is included.
    • BB-3PCIU2

      Model 3PCIU2, universal PCI card, is suitable for many applications including industrial monitoring and control, SCADA, point-of-sale, medical and security. Outputs are independently configurable for RS-232, RS-422, or RS-485. DB9 male connectors offer positive thumbscrew locking - more robust than phone jack connectors. The card supports data rates up to 460.8 kbps, is plug-and-play compatible and has adjustable FIFO trigger thresholds for input and output. RS-485 operation supports both 2-wire and 4-wire (full and half-duplex) and Automatic Send Data Control. A comprehensive technical manual and CD ROM with drivers is included.
    • BB-3PCIOU2

      Model 3PCIOU2, 2-port universal PCI card, is suitable for many applications including industrial monitoring and control, SCADA, point-of-sale, medical and security. This optically isolated card features 2000 VDC port-to-port isolation. Compare this card to others – B B SmartWorx' Premium Isolation Zone, along with optical couplers and a unique isolated DC-DC converter design, protect your PC from voltage surges and ground loops. Outputs are independently configurable for RS-232, RS-422, or RS-485. DB9 male connectors offer positive thumbscrew locking - more robust than phone jack connectors. The card supports data rates up to 460.8 kbps, is plug-and-play compatible and has adjustable FIFO trigger thresholds for input and output. RS-485 operation supports both 2-wire and 4-wire (full and half-duplex) and Automatic Send Data Control. A comprehensive technical manual and CD ROM with drivers is included.
    • BB-3PCIOU1

      Model 3PCIOU1, 1-port universal PCI card, is suitable for many applications including industrial monitoring and control, SCADA, point-of-sale, medical and security. This optically isolated card features 2000 VDC port-to-port isolation. Compare this card to others – B B SmartWorx' Premium Isolation Zone, along with optical couplers and a unique isolated DC-DC converter design, protect your PC from voltage surges and ground loops. Outputs are independently configurable for RS-232, RS-422, or RS-485. DB9 male connectors offer positive thumbscrew locking - more robust than phone jack connectors. The card supports data rates up to 460.8 kbps, is plug-and-play compatible and has adjustable FIFO trigger thresholds for input and output. RS-485 operation supports both 2-wire and 4-wire (full and half-duplex) and Automatic Send Data Control. A comprehensive technical manual and CD ROM with drivers is included.
  • Serial Accessories

    Serial accessories for your network ensure reliable serial device connections with cables, null modems, replacement fuses, copper grounding straps, wiring terminal boards, and other accessories.

    • BB-9PAMF6

      Model 9PAMF6 D-subminiature cable offers excellent performance at competitive pricing. The cable utilizes 28 AWG stranded conductors with foil shielding for flexibility and performance. Fully molded backshells with shielding provide better immunity to outside noise. Molded thumbscrews for connecting hardware makes securing the cables quick and easy.
    • BB-232CAMS

      Make easy connections between your serial equipment with this reliable, quality built, D-subminiature serial adapter cable.
  • Serial Converters

    Our industrial RS-232 to RS-422 and RS-485 converters are ideally suited for the industrial automation market and other “control panel” applications. Some offer triple isolation and hardened Class 1 Division 2 certification for use in hazardous locations and temperature extremes.

    • BB-SCP211T-DFTB3

      Model SCP211T-DFTB3 serial converter is compact and rugged, designed and tested to meet heavy industrial EMC standards. The RS-232 signal is connected through a female DB9 connector. The RS-422/485 (2-wire and 4-wire) signal is connected through a removable terminal block, making wiring easy. Power is connected through a two-position, removable terminal block. Bit-wise enabled circuitry automatically detects the character time-out eliminating the need to set DIP switches for the baud rate. Model SCP211T-DFTB3 supports wide operating temperature range.This model can be used when isolation is not required, such as applications in which the data line does not exit the control cabinet.
    • BB-SCP211-DFTB3

      Model XXXX serial converter is compact and rugged, designed and tested to meet heavy industrial EMC standards. The RS-232 signal is connected through a female DB9 connector. The RS-422/485 (2-wire and 4-wire) signal is connected through a removable terminal block, making wiring easy. Power is connected through a two-position, removable terminal block. Bit-wise enabled circuitry automatically detects the character time-out eliminating the need to set DIP switches for the baud rate. Model SCP211-DFTB3 is non-isolated and made for less demanding temperature extremes. This model can be used when isolation is not required, such as applications in which the data line does not exit the control cabinet.
    • BB-FOSTCDRI-ST

      Model FOSTCDRi-ST is designed with functionality required for heavier industrial environments. This industrial-grade isolated converter changes RS-232, RS-422, or RS-485 to single-mode fiber optics. Model FOSTCDRi-ST  extends serial data ranges up to 15 km (9 mi) and provides the most versatile connection possible between asynchronous full- or half-duplex serial equipment. In addition to direct point-to-point connectivity, it is capable operating in a multi-drop mode. This allows one serial device to communicate with up to 31 others around a fiber optic ring. Since it supports mixed serial standards, it can replace other converters and isolators and add the EMI/RFI immunity inherent to fiber optic communications. Fiber optic connection is single-mode ST. Automatic Send Data Control circuit controls the RS-422/485 driver chip, eliminating the requirement for special software. Easy to install and configure, it has a 12-position DIP switch to set up the RS-422/485 parameters and removable terminal blocks to connect serial signals and power. In RS-232 mode, it supports Transmit Data and Receive Data. Handshaking signals are not passed through.
    • BB-FOSTCDRI-SC

      Model FOSTCDRi-SC is designed with functionality required for heavier industrial environments. This industrial-grade isolated converter changes RS-232, RS-422, or RS-485 to single-mode fiber optics.FOSTCDRi-SC extends serial data ranges up to 15 km (9 mi) and provides the most versatile connection possible between asynchronous full- or half-duplex serial equipment. In addition to direct point-to-point connectivity, it is capable operating in a multi-drop mode. This allows one serial device to communicate with up to 31 others around a fiber optic ring. Since it supports mixed serial standards, it can replace other converters and isolators and add the EMI/RFI immunity inherent to fiber optic communications. Fiber optic connection is single-mode SC. Model Automatic Send Data Control circuit controls the RS-422/485 driver chip, eliminating the requirement for special software. Easy to install and configure, it has a 12-position DIP switch to set up the RS-422/485 parameters and removable terminal blocks to connect serial signals and power. In RS-232 mode, it supports Transmit Data and Receive Data. Handshaking signals are not passed through.
    • BB-FOSTCDRI-INV

      Model FOSTCDRI-INV is a premium industrial serial to multi-mode fiber optic converter. Its rugged design is UL approved and certified for Class 1/Division 2 industrial environments. It extends data communications up to 4 km (2.5 miles). It provides three-way optical isolation on the input, output and power lines. In addition to direct point-to-point connectivity, it is capable of operating in a multi-drop mode. This allows one serial device to communicate with up to 31 other devices around a fiber ring. Since it supports mixed standards, you can replace other converters and isolators and add the EMI / RFI protection inherent to fiber optic communications. In RS-232 mode, the converter supports Transmit and Receive data. Handshaking signals are not passed through. An Automatic Send Data Control circuit controls the RS-422/485 driver chip, eliminating the requirement for external software. Easy to install and configure, it has a 12-position DIP switch on the bottom to configure RS-422/485 parameters. Serial data and power cables connect to removable terminal blocks. ST connectors are used for the fiber. Model FOSTCDRI-INV features an "inverted fiber state" and is suitable for applications requiring the fiber optic transmit light to be Off in the idle state.
    • BB-FOSTCDR-INV

      Model FOSTCDR-INV, serial to multimode fiber optic converter, is suitable for standard industrial installations. It extend data communications up to 4 km (2.5 mi) and provides two-way optical isolation on the input and output lines. Model FOSTCDR-INV provides the most versatile connection possible between any asynchronous full- or half-duplex serial equipment. In addition to direct point-to-point connectivity, it is capable operating in multi-drop mode. This allows one serial device to communicate with up to 31 other devices around a fiber optic ring. Since the converter supports mixed serial standards, you can replace other converters and isolators and add the EMI/RFI immunity inherent to fiber optic communications. An Automatic Send Data Control circuit controls the RS-422/485 driver chip, eliminating the requirement for special software. Easy to install and configure, it has an 8-position DIP switch to set up RS-422/485 parameters and terminal blocks to connect serial signals and power. In RS-232 mode, it supports Transmit and Receive data. Handshaking signals are not passed through. Model FOSTCDR-INV features an "inverted fiber state" and is suitable for applications requiring the fiber optic light to be Off in the idle state.
    • BB-FOSTC

      Fiber optic cabling has inherent resistance to EMI/RFI and transient immunity, making it ideal for industrial and utility data communication applications. Model FOSTC provides the most versatile connection possible between asynchronous serial equipment using fiber optic cable. Any two pieces of asynchronous serial equipment can communicate full- or half-duplex over two fibers at distances up to 4 km (2.5 mi). The converter can be used for point-to-point communications between serial devices. It can also be used to create a multi-drop master/slave configuration, allowing one serial device to talk to multiple slave devices around a fiber ring. RS-232, RS-422 or RS-485 data signals are supported. Different standards can be mixed and matched to allow RS-232 devices to connect to RS-422 or RS-485 systems. This means Model FOSTC can replace converters and isolators when connecting remote devices, while providing the EMI/RFI and transient immunity of optical fiber. Model FOSTC supports both Transmit Data and Receive Data lines, and provides full hardware control of the RS-485 driver with B B SmartWorx Automatic Send Data Control circuit. All serial connections are provided on the same DB25 female connector, while the multi-mode fiber is connected via two ST connectors. Powered by 12 VDC at 140 mA max. An external power supply is available for purchase.
    • BB-9PFLST

      Model 9PFLST allows any two pieces of RS-232 asynchronous serial equipment to communicate full-duplex over two multi-mode fibers. Typical distances up to 2.5 miles (4 km) are possible with no external power required. The 9PFLST supports both data signals at up to 115.2 kbps as well as the RTS/CTS handshake lines. This means the 9PFLST can replace short haul modems and isolators when connecting remote devices, while providing the EMI/RFI and transient immunity of optical fiber. RS-232 connections are provided on the same DB9 female connector, while the multi-mode fiber is connected via two ST connectors. The unit is port powered by the RS-232 Transmit Data and handshake lines. When handshake lines are not available, or when using a low power RS-232 port, the 9PFLST can be powered by an external 12VDC supply, drawing 50 mA maximum.
    • BB-4WSD9OTB

      Model 4WSD9OTB converts RS-232 to RS-422 or RS-485 (2 or 4-wire). 2,000 Volts two-way optical isolation protects devices from power surges, spikes and ground loops in harsh electrical environments. This in-line converter supports distances up to 1,200 m (4000 ft.) and data rates up to 115.2 kbps. Switchable modes support 2-wire RS-485, 4-wire RS-485, and full-duplex RS-422. DB9 female RS-232 input. Removable terminal blocks for RS-422/485 and external power make wiring easy. Accepts external power from 10-48 VDC from an industrial power source or plug in power supply. The power supply is sold separately.
    • BB-4WSD25OTB

      Model 4WSD25OTB converts RS-232 to RS-422 or RS-485 (2 or 4-wire). 2,000 Volts two-way optical isolation protects devices from power surges, spikes and ground loops in harsh electrical environments. This in-line converter supports distances up to 1,200 m (4000 ft.) and data rates up to 115.2 kbps. Switchable modes support 2-wire RS-485, 4-wire RS-485, and full-duplex RS-422. DB9 female RS-232 input. Removable terminal blocks for RS-422/485 and external power make wiring easy. Accepts external power from 10-48 VDC from an industrial power source or plug in power supply. The power supply is sold separately.
    • BB-485SD9RJ

      This port-powered, two channel converter allows your computer to communicate longer distances by converting TD and RD RS-232 lines to RS-485 signals. RS-485 also provides multi-drop capability. Model 485SD9RJ features Automatic Send Data Control which enables the driver when data is present on the RS-232 side. Control of the driver is automatic at speeds up to 115.2 kbps. The converter is powered from the RS-232 data and handshake lines whether the lines are high or low. No handshake line change is necessary to control the data lines. The RS-485 driver is enabled with each bit of data. The RS-485 receiver is disabled when the driver is enabled and is enabled when the driver is disabled. This converter is suitable for field service, where a power supply would add clutter, or anywhere you need compact, easy-to-use, economically priced serial conversion.
    • BB-485OI9TB

      Model 485OI9TB, isolated converter, converts unbalanced, full duplex RS-232 signals to balanced full-duplex (4-wire) RS-422/485 or half-duplex (2-wire) RS-485 signals. The converter provides 1,500 Volts RMS optical isolation for data lines and ground (and connected devices) between the RS-232 and RS-422/485 signals. RS-232 port has a female DB9 connector. RS-422/485 port has a 6-position terminal block. The RS-232 side of the converter draws power from the handshake lines (DTR, RTS). At least one handshake line must be asserted (raised high) to power the RS-232 side. The RS-422/485 side must be powered by an external 12 VDC power supply (sold separately).
    • BB-485LDRC

      The 485LDRC is an optically isolated RS-232 to RS-422/485 converter. RS-232 signals interface through a terminal block. RS-422/485 signals and power inputs connect to the terminal block. Terminal blocks are arranged to allow easy wiring inside a control panel. Built-in Automatic Send Data Control circuitry allows quick set-up and eliminates the need for external software drivers to control handshake signals. The converter operates on externally sourced 10-30 VDC power. Optically isolated data lines (2,000 V on input/output) with 500W surge suppression ensure that connected equipment is protected even in the harshest environments. DIN rail mount design snaps on standard 35mm rail and a small form factor fits neatly into tight cabinets. The 485LDRC is ideal for critical industrial communications, factory automation, in-cabinet conversion, warehouse automation, security, and many other applications.
    • BB-485COSR

      Model 485COSR, RS-232 to RS-485 converter, converts unbalanced, full-duplex RS-232 signals to balanced full-duplex (4-wire) or half-duplex (2-wire) RS-485 signals. The RS-232 port has a female DB25S connector with pins 2 (TD input) and 3 (RD output) supported. Protective Ground (pin 1) and Signal Ground (pin 7) are also passed through. Pins 4 (RTS) and 5 (CTS) are tied together. Pins 6 (DSR), 8 (CD), and 20 (DTR) are tied together, but not passed through the converter. The RS-485 port has a male DB25P connector with Send Data outputs on pins 2 and 14, and Receive Data inputs on pins 3 and 16, or 5 and 17. No special software requirements are needed since the RS-485 driver is enabled by the first transition on the RS-232 side of the Transmit Data line (Pin 2). Any transmission on the TD line keeps the RS-485 driver enabled by preventing the mono-stable multi-vibrator from timing out. The transmitter is disabled approximately 1 ms after the last transmitted character. This 1 ms timeout allows continuous transmission of data at 9600 baud or higher.
    • BB-485CARLP9A

      Model 485CARLP9A is an RS-232 to RS-485 converter that allows you to connect your laptop PC to Carrier branded HVAC equipment. Model 485CARLP9A is a port-powered, half-duplex RS-232 to RS-485 converter with send data control. The unit converts TD and RD RS-232 lines to balanced RS-485 signals and supports three-wire (Data A, B, and Signal Ground reference) RS-485 communications only. The converter is powered from the RS-232 handshake lines, RTS, CTS and DTR, DSR, CD. The handshake lines are looped back on each other and can be in either state. No handshake change is necessary – no software is required to control the lines. The RS-485 driver is enabled with each bit of data. The RS-485 receiver is disabled when the driver is enabled and enabled when the driver is disabled. This prevents data from being echoed back into the RS-232 device. The RS-232 side has a DB-9 female connector. The RS-485 side has a six-position RJ11 connector. Note:  Some names and words are trademarks of their respective owners. Carrier is a part of UTC Climate, Controls & Security, a unit of United Technologies Corporation ("UTC").
    • BB-485CON

      Model 485CON, RS-232 to RS-485 converter, converts unbalanced, full-duplex RS-232 signals to balanced, full-duplex or half-duplex RS-485 signals. RS-485 is an enhanced version of the RS-422 balanced line standard. It allows multiple drivers and receivers on a two-wire system. The RS-232 port uses a male DB-25P type of connector with pins 2 (TD input) and 3 (RD output) supported. Protective Ground (pin 1) and Signal Ground (pin 7) are also connected. The RS-485 port uses a female DB-25S type of connector with Send Data outputs on pins 2 and 14, and Receive Data inputs on pins 5 and 17. Protective Ground (pin 1) and Signal Ground (pin 7) are connected through to the RS-232 connector. The polarity of the two RS-485 lines must be correct. With no data being sent, the RS-232 line should be negative and the RS-485 "A" terminal should be negative with respect to the "B" terminal. If your equipment uses a " " and "-" naming scheme, in most cases the "A" line will be connected to the "-" and the "B" line will be connected to the " ". The RS-485 driver must be enabled when checking the polarity of the output of a RS-485 driver. On this connector, the RTS input (pin 4), on the RS-232 side must be raised to enable the RS-485 driver. Figure 1 shows how to interconnect two RS-485 converters using two signal wires. The resistors Rt are optional, depending on the line length, baud rate, etc. The resistors should be about the impedance of the line used, which is normally about 120 Ohms each. Termination resistors are installed only at each end of the RS-485 multi-drop network. RTS must be off (low or marking) to receive and on (high or spacing) to transmit. Both RTS’s should not be on at the same time. Although you will not damage anything, the data sent will be garbled. If both RTS lines are off, the line may be floating and random data may appear on the outputs. Your protocol should allow for this if it can happen. Up to 32 receivers can be driven by any one generator. This allows you to put together large systems with many drop points. The termination resistors should be located at approximately opposite ends of the system.
    • BB-422TTL

      Model 422TTL converts RS-422 or EIA-530 signals to 5V TTL at data rates up to 115.2 kbps. Two channels are used to convert RS-422 to TTL and two channels are used to convert TTL to RS-422. A DB25 male connector is used on the TTL side and a DB25 female connector is used on the RS-422/EIA-530 side. The converter supports RD, TD, RTS, and CTS. Pin 7 is signal ground for both connectors. The converter supports baud rates up to 115.2 kbps. Open pads are provided for each line. If desired, you can change the pin connectors for any of the 4 channels. When converting a second RS-422 channel, use the corresponding RTS A and RTS B pins (refer to the Quick Start Guide). The converter inverts the TTL signal. Refer to the specifications table to determine polarity. An external 12 VDC power supply is required (not included).
    • BB-422PP9TB

      Model 422PP9TB is a port-powered, two-channel converter that changes TD and RD RS-232 lines to balanced RS-422 signals extending communication distances up to 1.2 km (4,000 ft.). Automatic Send Data Control feature enables the RS-422 driver when data is present on the RS-232 side. Control of the driver is automatic at rates up to 115.2 kbps. The RS-422 driver and receiver are always enabled. With port-powering, a power supply is not required. Power comes from the DTR and RTS RS-232 handshake control lines. At least one handshake line must be present, in either the Positive or Negative voltage state. This permits use in applications without worrying about software control of the handshake lines. The converter is configured to transmit data in both directions in an RS-232 and RS-422 system. The RS-232 pin-out connects directly to a computer’s COM port or any other DTE device. Model 422PP9TB connections to the RS-422 side are made via a terminal board. Model 422PP9TB can also be powered from an external source. This converter is ideal for field service or "in-line" cable applications.
    • BB-422LP25R

      Model 422LP25R, RS-232 to RS-422 converter, converts unbalanced RS-232 signals to balanced RS-422 signals. The power used for this converter is derived from the Transmit Data line (pin 2) and the Handshake Control Lines (pins 4, 5, 6, 8, and 20). The converter can derive power from these lines when they are in the Positive or Negative voltage state. This permits the converter to be used in applications without regard to software control of the handshake lines. If no handshake lines are available and all power must be derived from the Transmit Data line, the converter can drive limited cable lengths. A guide for this condition would be to drive only several hundred feet of transmission line and not to terminate the transmission line with a resistor of less than 1000 Ohms. When more handshake lines are available, longer lengths of cable can be driven. This converter has been tested at 115.2k baud with 1220 meters (4000 feet) of cable.
    • BB-422CEC

      Model 422CEC, 8-channel RS-232 to RS-422 converter, converts unbalanced RS-232 signals to balanced RS-422 signals. The RS-422 Standard uses a balanced voltage digital interface to allow communications of 90K bits per second on cable lengths of 1200 meters (4000 feet). If this baud rate is exceeded the line length will decrease accordingly. Ten receivers can be connected to any one driver for use in multi-drop systems.
    • BB-232SPHI4

      Model 232SPHI4 isolates and protects RS-232 equipment from lightning surges, accidental high voltage shorts and ground loops. The isolator supports RS-232 data signals up to 115.2 kbps as well as RTS and CTS handshake lines. Model 232SPHI4 provides 4000 Volts isolation between sides — twice the rating of most isolators. DTE device connections are made through a DB-25 female. DCE device connections are made through a DB-25 male. The two sides of the isolator are powered independently to maintain isolation. Both sides can draw power from the RS-232 data and handshake lines, eliminating external powering requirements in nearly all systems. If the isolator is to be used with low power ports or when no handshake lines are available, external power can be supplied to either side or both. This versatile powering configuration minimizes the number of supplies required by the overall system.
    • BB-232LPTTL33

      Model 232LPTTL33, 4-channel TTL/CMOS converter, makes easy connections between TTL equipment and RS-232 ports and operates at data rates up to 115.2 kbps. It converts two channels (TX and RX) in each direction (bi-directional) from TTL to RS-232. Model 232LPTTL33 converts RS-232 to 3.3VDC TTL/CMOS compatible levels. Two channels convert from RS-232 to TTL/CMOS signals and two channels convert from TTL/CMOS signals to RS-232. The converter supports TD, RD, RTS, and CTS. DB9S female connector on the RS-232 side. DB9P male connector on the TTL/CMOS side. The converter is powered from the RS-232 data and handshake lines, whether the lines are high or low. Use this converter with almost any micro-controller or programmable logic controller (PLC) that supports TTL.
    • BB-232LPTTL

      Model 232LPTTL, 4-channel TTL/CMOS converter, makes easy connections between TTL equipment and RS-232 ports and operates at data rates up to 115.2 kbps. It converts two channels (TX and RX) in each direction (bi-directional) from TTL to RS-232. Model 232LPTTL converts RS-232 to 5VDC TTL/CMOS competitive levels. Two channels convert from RS-232 to TTL/CMOS signals and two channels  convert from TTL/CMOS signals to RS-232. The converter supports TD, RD, RTS, and CTS. DB9S female connector on the RS-232 side. DB9P male connector on the TTL/CMOS side. The converter is powered from the RS-232 data and handshake lines, whether the lines are high or low. Use this converter with almost any micro-controller or programmable logic controller (PLC) that supports TTL.
    • BB-FOSTCDRI-PH-MT

      Model FOSCTDRI-PH-MT is a premium heavy industrial serial-to-fiber optic converter. Designed for rugged industrial environments, it has been put through some of the most exacting compliance testing in the industry. Meeting IEC 61850-3 and IEEE 1613 requirements, it is suitable for installation in electrical substations. These specifications are more stringent than NEMA TS1/TS2 requirements for transportation applications. Powerful isolation protects equipment and data from damaging ground loops and surges. Additional isolation on the power supply circuits adds a third level of protection. Packaged in a rugged IP30 metal case, this converter converts serial signals to multi-mode fiber optic. Bit-wise enabled circuitry automatically detects the data rate without setting a DIP switch. In addition to direct point-to-point connectivity, operation in multi-drop mode is possible. This enables serial devices to communicate with up to 31 others in a fiber ring. Supporting mixed standards, you can replace other converters and add the EMI / RFI protection inherent to fiber optic communications.
    • BB-FOSTCDRI-PH-MC

      Model FOSCTDRI-PH-MC is a premium heavy industrial serial-to-fiber optic converter. Designed for rugged industrial environments, it has been put through some of the most exacting compliance testing in the industry. Meeting IEC 61850-3 and IEEE 1613 requirements, it is suitable for installation in electrical substations. These specifications are more stringent than NEMA TS1/TS2 requirements for transportation applications. Powerful isolation protects equipment and data from damaging ground loops and surges. Additional isolation on the power supply circuits adds a third level of protection. Packaged in a rugged IP30 metal case, this converter converts serial signals to multi-mode fiber optic. Bit-wise enabled circuitry automatically detects the data rate without setting a DIP switch. In addition to direct point-to-point connectivity, operation in multi-drop mode is possible. This enables serial devices to communicate with up to 31 others in a fiber ring. Supporting mixed standards, you can replace other converters and add the EMI / RFI protection inherent to fiber optic communications.
    • BB-232CLDR

      Model 232CLDR is a DIN rail mountable RS-232 to current loop converter. It is wide temperature rated and UL Recognized for industrial applications. It has one optically isolated 20 mA Transmit loop and one optically isolated Receive loop. Each loop can be set to either "Active" or "Passive." When set to "Active", an isolated 20 mA current is supplied for each loop (Transmit and Receive). A 10 to 30 VDC power supply (required, not included) provides power to the converter and both current loops. The 232CLDR communicates at baud rates up to 19.2 kbps and can extend communications up to 600 meters (2,000 ft.). 2,000V optical isolation protects equipment from damaging ground loops and surges. Two LED’s indicate data flow. Connections are made on terminal blocks.
    • BB-232CL9R

      Model 232CL9R is a port-powered RS-232 to current loop converter. No external power required for passive loop installations, but a power supply is required to generate an active loop.
    • BB-FOSTCDRI-PH-SC

      Model FOSCTDRI-PH-SC is a premium heavy industrial serial-to-fiber optic converter. Designed for rugged industrial environments, it has been put through some of the most exacting compliance testing in the industry. Meeting IEC 61850-3 and IEEE 1613 requirements, it is suitable for installation in electrical substations. These specifications are more stringent than NEMA TS1/TS2 requirements for transportation applications. Powerful isolation protects equipment and data from damaging ground loops and surges. Additional isolation on the power supply circuits adds a third level of protection. Packaged in a rugged IP30 metal case, this converter converts serial signals to single-mode fiber optic. Bit-wise enabled circuitry automatically detects the data rate without setting a DIP switch. In addition to direct point-to-point connectivity, operation in multi-drop mode is possible. This enables serial devices to communicate with up to 31 others in a fiber ring. Supporting mixed standards, you can replace other converters and add the EMI / RFI protection inherent to fiber optic communications.
    • BB-FOSTCDR

      Model FOSTCDR, serial to multimode fiber optic converter, is suitable for standard industrial installations. It extend data communications up to 4 km (2.5 mi) and provides two-way optical isolation on the input and output lines. Model FOSTCDR provides the most versatile connection possible between any asynchronous full- or half-duplex serial equipment. In addition to direct point-to-point connectivity, it is capable operating in multi-drop mode. This allows one serial device to communicate with up to 31 other devices around a fiber optic ring. Since the converter supports mixed serial standards, you can replace other converters and isolators and add the EMI/RFI immunity inherent to fiber optic communications. An Automatic Send Data Control circuit controls the RS-422/485 driver chip, eliminating the requirement for special software. Easy to install and configure, it has an 8-position DIP switch to set up RS-422/485 parameters and terminal blocks to connect serial signals and power. In RS-232 mode, it supports Transmit and Receive data. Handshaking signals are not passed through.
    • BB-SCP311T-DFTB3

      Model SCP311T-DFTB3 serial converter is compact and rugged, designed and tested to meet heavy industrial EMC standards. The RS-232 signal is connected through a female DB9 connector. The RS-422/485 (2-wire and 4-wire) signal is connected through a removable terminal block, making wiring easy. Power is connected through a two-position, removable terminal block. Bit-wise enabled circuitry automatically detects the character time-out eliminating the need to set DIP switches for the baud rate. Model SCP311T-DFTB3 offers 2 kV isolation plus a -40 to 80°C wide operating temperature. This rugged model is an excellent investment for protecting your expensive control equipment.
    • BB-485DRCI-PH

      Model BB-485DRCI-PH is our premium heavy industrial RS-232 to RS- 422/485 isolated converter. Designed for rugged industrial environments, it has been put through some of the most exacting compliance tests in the industry. Meeting the requirements of IEC 61850-3 and IEEE 1613, it is suitable for installation in electrical substations. These specifications are more stringent than the NEMA TS1/TS2 requirements for transportation applications. Powerful isolation on both data ports protects your equipment and data from damaging ground loops and surges. Additional isolation on the power supply circuits adds a third degree of protection. Packaged in a rugged IP30 metal case, it converts unbalanced, full or half-duplex RS-232 signals to balanced RS-422/485 signals. Featuring Automatic Send Data Control circuitry, it does not require special software control of handshake signals in RS-485 mode.
    • BB-485LDRC9

      The BB-485LDRC9 is an optically isolated RS-232 to RS-422/485 converter. RS-232 signals interface through a DB9 female connector or a terminal block. RS-422/485 signals and power inputs connect to the terminal block. Terminal blocks are arranged to allow easy wiring inside a control panel. Built-in Automatic Send Data Control circuitry allows quick set-up and eliminates the need for external software drivers to control handshake signals. The converter operates on externally sourced 10-30 VDC power. Optically isolated data lines (2,000 V on input/output) with 500W surge suppression ensure that connected equipment is protected even in the harshest environments. DIN rail mount design snaps on standard 35mm rail and a small form factor fits neatly into tight cabinets. The BB-485LDRC9 is ideal for critical industrial communications, factory automation, in-cabinet conversion, warehouse automation, security, and many other applications.
    • BB-FOSTCDRI

      Model FOSTCDRI is a premium industrial serial to multi-mode fiber optic converter. Its rugged design is UL approved and certified for Class 1/Division 2 industrial environments. It extends data communications up to 4 km (2.5 miles). It provides three-way optical isolation on the input, output and power lines. In addition to direct point-to-point connectivity, it is capable of operating in a multi-drop mode. This allows one serial device to communicate with up to 31 other devices around a fiber ring. Since it supports mixed standards, you can replace other converters and isolators and add the EMI / RFI protection inherent to fiber optic communications. In RS-232 mode, the converter supports Transmit and Receive data. Handshaking signals are not passed through. An Automatic Send Data Control circuit controls the RS-422/485 driver chip, eliminating the requirement for external software. Easy to install and configure, it has a 12-position DIP switch on the bottom to configure RS-422/485 parameters. Serial data and power cables connect to removable terminal blocks. ST connectors are used for the fiber.
    • BB-485SD9TB

      This port-powered, two channel converter allows your computer to communicate longer distances by converting TD and RD RS-232 lines to RS-485 signals. RS-485 also provides multi-drop capability. Model 485SD9TB features Automatic Send Data Control which enables the driver when data is present on the RS-232 side. Control of the driver is automatic at speeds up to 115.2 kbps. The converter is powered from the RS-232 data and handshake lines whether the lines are high or low. No handshake line change is necessary to control the data lines. The RS-485 driver is enabled with each bit of data. The RS-485 receiver is disabled when the driver is enabled and is enabled when the driver is disabled. This converter is suitable for field service, where a power supply would add clutter, or anywhere you need compact, easy-to-use, economically priced serial conversion. Model 485SD9TB can be optionally powered by an external 12 VDC power supply.
    • BB-485SD9R

      This port-powered, two channel converter allows your computer to communicate longer distances by converting TD and RD RS-232 lines to RS-485 signals. RS-485 also provides multi-drop capability. Model 485SD9R features Automatic Send Data Control which enables the driver when data is present on the RS-232 side. Control of the driver is automatic at speeds up to 115.2 kbps. The converter is powered from the RS-232 data and handshake lines whether the lines are high or low. No handshake line change is necessary to control the data lines. The RS-485 driver is enabled with each bit of data. The RS-485 receiver is disabled when the driver is enabled and is enabled when the driver is disabled. This converter is suitable for field service, where a power supply would add clutter, or anywhere you need compact, easy-to-use, economically priced serial conversion.
    • BB-485DRCI

      Model 485DRCi industrial-grade isolated serial converter changes RS-232 signals to RS-422 for increased range, or to RS-485 for increased range plus multi-drop capability. Designed for rugged industrial use, the 485DRCi is UL approved and certified for operation in Class 1/Division 2 environments and also offers 2,000V 3-way optical isolation on input, output, and power lines. In addition to optical isolation, the unit has surge suppression on the RS-422/485 lines. This DIN rail mountable converter optically isolates and converts unbalanced, full or half-duplex, RS-232 signals to balanced RS-422/485 signals at baud rates up to 115.2 kbps. Configuration is made via a 12-position DIP switch on the bottom of the converter. Featuring Automatic Send Data Control circuitry, the converter does not require special software control of handshake signals in RS-485 mode. Removable terminal blocks for power and RS-422/485 signals make wiring easy. It is powered by a supply voltage of 10 to 48 VDC which is isolated from all data and signal ground lines.
  • Serial Repeaters

    With our data isolation and data repeaters, you can protect your electronics from power spikes, lightning surges, dangerous ground loops, and accidental high voltage shorts, while increasing your data line range.

    • BB-485OP

      Model 485OP is an optically isolated RS-422/485 signal repeater. In addition to 2KV isolation on the data lines, it can be used to extend RS-422/485 circuits an additional 1.2 km (4,000 ft.), thereby doubling the range. An added benefit is the ability to add another 32 nodes to an RS-485 network and join 2 and 4 wire systems. The compact design fits almost anywhere. Terminal blocks allow easy installation. Wiring schematic on the label eliminates guesswork. A 12 VDC power supply is included with blades for US, EU, UK, AU, UP & CN.
    • BB-485OPDR

      The BB-485OPDR is an optically isolated RS-422/485 isolated line repeater that can be used to isolate a piece of equipment from the rest of the network. As a repeater, it extends the distance of an existing network an additional 1.2 km (4000 ft.) and expands it beyond the typical 32-node limitation. Data signals and the power inputs connect to the terminal block. 600W surge suppression ensures that the connected equipment is protected even in the harshest of environments. 2-wire RS-485, 4-wire RS-485 and RS-422 are supported. The repeater operates on externally sourced 10 to 30 VDC power. The enclosure has a DIN rail mount that is designed to fit easily on a standard 35mm rail.
    • BB-485OPDR-HS

      The BB-485OPDR-HS is a high speed, optically isolated RS-422/485 repeater that supports data rates up to 1.5 Mbps, making it suitable for use in fieldbus systems such as Profibus. The BB-485OPDR-HS provides 2 kV digital Isolation with 8 kV air ESD protection and 600 W transient voltage suppression on the data lines. The BB-485OPDR-HS can be used to extend the range of a network up to 4000 ft. (1.2 km), depending on data rates, and to add additional nodes. 2-Wire RS-485, 4-Wire RS-485 and RS-422 are supported. Data signals and the power inputs connect to built-in terminal blocks. The repeater operates on externally sourced 10 to 30 VDC power. The enclosure has a DIN rail mount that is designed to fit easily on a standard 35mm rail.
    • BB-485OPDRI-PH

      Model BB-485OPDRI-PH is our premium heavy industrial RS-422/485 isolated repeater. Designed for rugged industrial environments, it has been put through some of the most exacting compliance tests in the industry. Meeting the requirements of IEC 61850-3 and IEEE 1613, it is suitable for installation in electrical substations. These specifications are more stringent than the NEMA TS1/TS2 requirements for transportation applications. Powerful isolation on both data ports protects your equipment and data from damaging ground loops and surges. Additional isolation on the power supply circuits adds a third degree of protection. Packaged in a rugged IP30 metal case, it extends full or half-duplex RS- 422/485 signals an additional 4000 feet and allows you to add another 32 nodes to your network. Our bit-wise enabled circuitry automatically detects the data rate without setting a DIP switch.
    • BB-232OPDRI-PH

      The BB-232OPDRI-PH is a premium heavy industrial RS-232 isolated repeater. Designed for rugged industrial environments, it meets some of the most exacting compliance tests in the industry including IEC 61850-3 and IEEE 1613 making it suitable for installation in electrical substations. These specifications are more stringent than the NEMA TS1/TS2 requirements for transportation applications. Powerful isolation on both data ports protects your equipment and data from damaging ground loops and surges. Additional isolation on the power supply circuits adds a third degree of protection. Packaged in a rugged IP30 metal case, this repeater operates in wide temperature extremes. The panel mount form factor with DIN Rail mount option makes it easy to integrate into your control panel or other industrial equipment. Installation and configuration is easy. Data is connected with a DB9 female connector (DCE) and a DB9 male connector (DTE). Power is connected through terminal block that accepts 10 to 48 VDC from any external source.
    • BB-232OPDR

      The 232OPDR is a DIN Rail mountable RS-232 optical isolator and repeater. It provides 2000 V Isolation for four RS-232 signal lines, two in each direction. The isolator has four LED’s to show data flow and one LED to indicate power. Connections are made to a terminal block. The isolation provides protection for computer equipment from ground loops and induced currents caused by lightning or heavy electrical loads. It also functions as a repeater to extend RS-232 signals another 50 feet. The 232OPDR can support two data pairs or one data pair plus control signals in both directions.
    • BB-485OPDRI

      The 485OPDRI isolated RS-422/485 repeater is designed for rugged industrial environments. It is UL listed and certified for use in Class 1/Division 2 locations. Powerful optical isolation on both data ports protects your equipment and data from damaging ground loops and surges. Additional isolation on the power supply circuits add a third degree of protection. Packaged in a rugged ABS plastic case, this repeater operates in wide temperature extremes. With a 35mm DIN rail mounting bracket, it easily integrates into control panels or other industrial equipment. Installation and configuration is easy with DIP switches to set up baud rate and serial communications mode. Removable terminal blocks make wiring a snap. Power is connected through separate terminal block that accepts 10 to 48 VDC from any external source.
    • BB-232OPDRI

      Model 232OPDRI is our premium Industrial RS-232 Isolated Repeater. Designed for rugged industrial environments, it is UL listed and certified for use in Class 1 Division 2 locations. Powerful optical isolation on both data ports protects your equipment and data from damaging ground loops and surges. Additional isolation on the power supply circuits adds a third degree of protection. Packaged in a rugged plastic case, the 232OPDRI operates in wide temperature extremes. With a 35mm DIN rail mounting bracket, it is easy to integrate into a control panel or other industrial equipment. Installation and configuration is easy. Data is connected with a DB9 female connector (DCE) and a DB9 male connector (DTE). Power is connected through a terminal block that accepts 10 to 48 VDC from any external source.
  • Surge Suppressors

    Protect your equipment and data from harmful power surges and voltage spikes with industrial surge protectors. Our heavy duty and single stage surge protectors can manage all your essential surge suppression requirements.

    • BB-CANOP

      Model CANOP increases the node capacity of CAN (Control Area Network) systems while protecting CAN networks from component destroying surges and transients. The CANOP provides 2,000 VDC of optical isolation to separate and protect critical segments of the system from the rest of the CAN Network. It is protocol independent, allowing it to work with different CAN protocols and frame lengths. According to the CAN specification, the CAN network must be terminated at both ends. Networks that are not properly terminated may experience data errors or miss data completely. The CANOP creates two new ends to the CAN network. Space is provided on the board for a termination resistor on each side, R6 and R8 (120 Ohm resistor recommended). If the CANOP is not at the end of the network, it should not be terminated. Model CANOP is bit-wise enable, allowing it to automatically adjust for different baud rates. Bit-wise enable only enables the driver on every low bit received. It also disables the driver on the receive side for the low bit plus a maximum of 2µ seconds. This prevents data from echoing back from the CANOP, but allows the nodes to respond back.
    • BB-9POP4

      Model 9POP4 isolates and protects RS-232 equipment from lightning surges, accidental high voltage shorts, and ground loops. RS-232 data signals TD, RD, RTS, and CTS are supported at up to 230.4 kbps. Isolation circuits are 2.5 kV rated and protects valuable equipment while maintaining maximum uptime. Each side of the isolator receives power from a single 12 VDC power supply to maintain the isolation. This powering configuration allows the device to be used in a system with only one power supply, regardless of the power provided by the RS-232 ports. The isolator uses DB9 male and DB9 female connectors. The female connector is wired as a DCE and should be connected to a DTE port. The male connector is a DTE and should be connected to a DCE port. If you are connecting a DTE to a DTE or a DCE to a DCE, you will need a null modem adapter. Recommended, tested and certified power supply is available from Advantech B B SmartWorx. (Note: using any other power supply may bypass or degrade the isolation barrier.)
    • BB-485FPP

      Single stage surge protectors offer a high degree of protection with Transient Voltage Suppressors (TVS) for each protected line. Model 485FPP has 600W Transient Voltage Suppressors to clamp voltages without adversely affecting normal RS-422/485 data. Fast-acting 125 mA PCB fuses to protect RS-422 and RS-485 circuits against transient voltages that are too long or too large for normal suppression. The 485FPP has 4 wires and terminal blocks for easy installation inline between the data cables – as close as possible to the serial port. Once a fuse is blown, the unit should be disposed and replaced.
    • BB-232SP9

      Model 232SP9 protects RS-232 ports from damage caused by large voltage peaks from lightning and other power problems. The surge protector uses 600W Transient Voltage Suppressors to protect all 9 pins. It has one DB9 male and one DB9 female connector with all 9 pins passing straight through. The TVSs are connected between the ground screw and pins 1, 2, 3, 4, 5, 6, 7, 8 and 9. The 232SP9 will suppress any voltage levels above 12 Volts without affecting the normal RS-232 data. The 232SP9 is placed inline, between the data cable and the RS-232 port, as close to the protected port as possible. The ground screw must be connected to earth ground. A minimum of 12 AWG copper wire is recommended. Model CU15B is 1.5 x 0.016 in (38 x 0.25 mm) copper cut to length for ground connections that are longer than a few feet (one meter). If this device is not properly grounded it will not protect RS-232 lines.
    • BB-232HESP

      Model 232HESP is a three-stage surge protector that protects against lightning strikes, power surges and other types of voltage disturbances with three stages of protection for each line: a gas discharge tube followed by a series resistor and finally a Transient Voltage Suppresser (TVS). The surge protector is housed in a tough metal, panel mount case with a protected signal ground connection and dedicated chassis ground lug.In order to work properly, it is important to have a good connection between the #10 screws and a solid earth ground. Two terminal posts and two metal mounting brackets provide a good ground connection.
    • BB-485HESP

      Model 485HESP is a three-stage surge protector that protects against lightning strikes, power surges and other types of voltage disturbances with three stages of protection for each line: a gas discharge tube followed by a series resistor and finally a Transient Voltage Suppresser (TVS). The surge protector is housed in a tough metal, panel mount case with a protected signal ground connection and dedicated chassis ground lug.In order to work properly, it is important to have a good connection between the #10 screws and a solid earth ground. Two terminal posts and two metal mounting brackets provide a good ground connection.
    • BB-422HESP

      Model 422HESP is a three-stage surge protector that protects against lightning strikes, power surges and other types of voltage disturbances with three stages of protection for each line: a gas discharge tube followed by a series resistor and finally a Transient Voltage Suppresser (TVS). The surge protector is housed in a tough metal, panel mount case with a protected signal ground connection and dedicated chassis ground lug.In order to work properly, it is important to have a good connection between the #10 screws and a solid earth ground. Two terminal posts and two metal mounting brackets provide a good ground connection.
    • BB-HESP4DR

      Model BB-HESP4DR meets IEEE 1000-4-5: 1995 and IEEE C62.41-1991 recognized standards for premium surge protectors. It protects against lightning strikes, power surges, and other types of voltage disturbances with three stages of protection for each supported line: a gas discharge tube followed by a series resistor and finally a Transient Voltage Suppresser (TVS). Five RS-422/485 signals on terminal blocks are supported with a clamping voltage of 6.8 Volts. The BB-HESP4DR is housed in a sturdy DIN rail mount case with a #10 grounding screw. In order to work properly, it is important to have a good connection between the #10 screw and a solid earth ground.