Honeywell FC-DCOM-485 V1.1 Communication Interface Module

The Honeywell FC-DCOM-485 V1.1, also identified as the FC-DCOM-485 communication interface module, provides RS485/RS422 signal output for serial communication between connected control system equipment. It operates from a 5 VDC supply provided by the Control Processor(s), with a maximum input current of 500 mA and configurable communication signal formats supporting baud rates up to 2 MBaud.

Hardware Specifications

RS485/RS422 Communication Characteristics

The FC-DCOM-485 provides serial signal output compliant with the specified EIA/TIA-485-A electrical levels. Its supported baud rate range extends to 2 MBaud, with transparent, Manchester, FM0, and FM1 transmission formats listed in the product specifications.

The module receives its 5 VDC operating supply from the Control Processor(s). System integration must account for the maximum 500 mA input current when verifying processor power capacity. The selected transmission format and baud rate must match the requirements of the connected communication equipment.

Frequently Asked Questions (FAQ)

Q: What power supply does the FC-DCOM-485 require?

A: The module requires 5 VDC +/-5%, supplied by the Control Processor(s). The maximum specified input current is 500 mA.

Q: Which serial communication interfaces are supported?

A: The module provides RS485/RS422 output according to EIA/TIA-485-A electrical levels and supports baud rates up to 2 MBaud.

Q: Which DIN rails are compatible with this module?

A: The specified mounting options are TS32 and TS35 x 7.5 DIN rails. The listed rail length used by the installation is 117 mm.

Field Installation Guidelines

• Mount the module on a compatible TS32 or TS35 x 7.5 DIN rail and secure it according to the enclosure and rail manufacturer's instructions.
• Verify that the Control Processor(s) can supply 5 VDC within the specified +/-5% tolerance and support the module's maximum 500 mA current demand.
• Confirm RS485/RS422 signal polarity, terminal assignments, and the selected communication format against the applicable Honeywell wiring documentation.
• Route communication cables separately from high-voltage power conductors and high-noise switching circuits where practical.
• Apply cable shielding and grounding according to the system grounding design. Avoid creating unintended ground loops.
• Verify network termination and biasing requirements against the connected equipment documentation before commissioning.
• Confirm the installed module revision and system compatibility before applying power.