Honeywell FC-DCOM-232/485 CC V2.1 Communication Interface FTA

The Honeywell FC-DCOM-232/485 CC V2.1, also cataloged as the FC-DCOM-232/485 Communication Interface FTA for RS232/485, operates as a dedicated hardware component for converting and isolating physical serial data signals within Honeywell Safety Manager and Fail Safe Controller architectures. Powered by a 5 VDC input supply drawing up to 500 mA directly from the Control Processor, the module converts backplane logic streams to RS232 output levels at baud rates up to 250 kBaud or RS485/422 differential levels up to 2 MBaud.

Hardware Specifications

Channel-to-Channel Isolation & Serial Gateway Interface

The FC-DCOM-232/485 CC V2.1 provides physical galvanically isolated serial transmission lines to bridge field instrumentation with central safety processors without introducing ground loops. Supporting 4-20 mA HART loop protocol gateways and differential RS485 serial buses, the module processes high-speed Manchester, FM0, FM1, and transparent data formats up to 2 MBaud. Dedicated line suppression circuits protect internal Control Processor backplane communication buses against high-voltage electrical transients generated on field-side serial loops.

Frequently Asked Questions

Q: What power source supplies the operating voltage for the FC-DCOM-232/485 CC V2.1 interface?

A: The module derives its required 5 VDC +/-5% operating power directly from the main chassis Control Processor backplane, drawing up to 500 mA maximum.

Q: What serial encoding schemes are supported on the RS485/422 communication channels?

A: The physical layer transceivers support transparent data pass-through as well as FM0, FM1, and Manchester encoding structures up to a maximum baud rate of 2 MBaud.

Q: What is the physical mounting rail space required for module installation?

A: The interface card mounts on standard TS32 or TS35 x 7.5 DIN rails and occupies a minimum rail footprint length of 11.7 cm (4.6 in).

Field Installation Guidelines

1. Confirm that main power supplies to the system rack and connected communication cables are de-energized prior to mounting.
2. Snap the assembly firmly onto a TS32 or TS35 x 7.5 DIN rail, ensuring a minimum dedicated length of 11.7 cm is available.
3. Connect field serial communication wiring to the EIA/TIA-232 or EIA/TIA-485-A terminals using high-quality shielded cable.
4. Terminate all cable drain wires to the central cabinet earth grounding bar to prevent noise coupling onto differential signals.
5. Apply power from the Control Processor and verify front panel LED status before placing the communication channel online.