Foxboro RH926GH Communication Terminal Board (FTA)

Foxboro RH926GH communication terminal board (FTA) complete file
Brand: Schneider Foxboro I/A Series Compact 200 DCS
Original factory obsolete part number: P0926GH (RH926GH is a new-generation replacement model, and the hardware of the two is completely compatible)
Category: Four-channel serial communication dedicated terminal base, paired with serial port gateway FBM231
1. Compatible core card
RH926GH is only paired with FBM231
FBM231: 4-channel serial port multi-function communication FBM, supporting RS232/RS422/RS485, Modbus RTU, custom serial port protocol, redundant configuration possible
Combined function: FBM231 is inserted into the rack backplane, flat cable is connected to the RH926GH terminal base, all the serial ports of on-site instruments, inverters, third-party PLC are connected to this terminal board
2. Meaning of suffix GH in the model
G: Standard isolated communication terminal, with signal isolation to suppress interference
H: Screw-pressed type terminal (different from spring terminal JK/JL series)
3. Hardware channels and communication specifications

independent serial channels
Each channel can be software-switched interface type:
RS232: Maximum transmission distance 15m, for upper-level debugging and serial port printer connection
RS422/RS485: Longest 1200m, multi-device bus networking, Modbus RTU instruments, inverters, PLC
Supported baud rates
300 ~ 57600 bps, fully industrial standard rate compatibility
Electrical isolation
Each serial port is independently isolated, isolation withstand voltage 2kV AC, stable operation of inverters, motors in strong interference sites
Terminal structure
Screw-wired terminal, compatible with 0.5~1.5mm² shielded twisted pair, built-in shielded grounding busbar
Terminal resistor
Built-in programmable 120Ω terminal matching resistor, enabling terminal at the end of the bus

 Power supply and installation
Power supply: Provided by FBM231 through the matching flat cable with 24VDC, terminal board does not require independent power supply
Installation: 35mm DIN rail independent external installation, direct insertion without rack backplane
Matching connection cables: RH928 series flat cables (1m/2m/3m selectable RH928AW/AX/AY)

 Environmental parameters
Operating temperature: -40℃ ~ +85℃
Humidity: 5%~95% RH, no condensation
Certification: CE, UL, Class1 Div.2 explosion-proof area available (refinery, chemical, oil and gas)
Protection IP20 (used in control cabinets)

Core application scenarios
DCS connects to third-party Modbus RTU devices: inverters, intelligent instruments, current transmitters, small PLC
Auxiliary control serial communication in power plants, boiler temperature control instruments, vibration monitoring equipment (such as Bently 1900 series) connected to I/A system
Serial data collection and remote serial communication expansion in chemical, oil and gas installations
Replacement of old P0926GH terminal board in old systems