Overview
The Honeywell FC-DCOM-232/485, also identified by the spare models FS-DCOM-232/485 and DCOM-232/485, is a communication interface module that provides one RS232 output port and two RS485 output ports. It operates from a 5 VDC supply and supports RS232 communication at baud rates up to 250 kBaud. The RS232 and RS485/422 interfaces follow their respective EIA/TIA electrical signaling standards.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | FC-DCOM-232/485 |
| Spare Models | FS-DCOM-232/485, DCOM-232/485 |
| Brand | Honeywell |
| Product Type | Communication Interface Module |
| Origin | USA |
| Weight | 0.15 kg |
| Dimensions | 11 x 7 x 6 cm (estimated shipping size) |
| Input Voltage | 5 VDC +/-5% |
| Input Current | 500 mA maximum |
| RS232 Output Ports | 1 |
| RS232 Signal Levels | EIA/TIA-232 |
| RS232 Baud Rate | 0-250 kBaud |
| RS485 Output Ports | 2 |
| RS485/422 Signal Levels | EIA/TIA-485-A |
| Tariff Code | 8537101190 |
Serial Communication Interface Characteristics
The FC-DCOM-232/485 provides separate serial output interfaces for equipment requiring RS232 or RS485/422 electrical signaling. The RS232 port supports baud rates up to 250 kBaud, while the RS485/422 interfaces follow the specified EIA/TIA-485-A signaling standard.
The module requires a nominal 5 VDC supply with a tolerance of +/-5%. Its maximum input current is 500 mA. The host system must provide a compatible power connection and support the module’s interface configuration. The available specifications do not establish galvanic isolation, port-to-port isolation, termination settings, or protocol conversion capabilities.
Frequently Asked Questions (FAQ)
Q: What serial interfaces does the FC-DCOM-232/485 provide?
A: It provides one RS232 output port and two RS485 output ports. The RS232 interface follows EIA/TIA-232 levels, and the RS485/422 interface specification references EIA/TIA-485-A levels.
Q: What power supply does the module require?
A: The specified input supply is 5 VDC +/-5%, with a maximum input current of 500 mA. Confirm the host system’s power capacity before installation.
Q: What is the maximum specified RS232 baud rate?
A: The specified RS232 baud rate range is 0-250 kBaud. The supported baud rates of connected devices must be configured to match. The available data does not specify a maximum baud rate for the RS485 ports.
Field Installation Guidelines
- Power verification: Confirm that the host supply provides 5 VDC within the specified +/-5% tolerance and can support the module’s maximum 500 mA input current.
- Interface identification: Verify the port assignments and connector pinout against the manufacturer’s hardware documentation before connecting field devices.
- Signal wiring: Route serial communication cables away from high-current conductors, switching power circuits, and sources of electromagnetic interference.
- Shielding and grounding: Apply the manufacturer’s cable-shield termination and grounding instructions. Do not assume that the communication ports provide galvanic isolation.
- Communication configuration: Match the RS232 baud rate and other applicable serial settings to the connected equipment. Verify RS485/422 wiring polarity and network topology against the equipment documentation.
- Commissioning: Inspect wiring before energizing the system. Verify communication with the host controller and connected devices using the approved commissioning procedure.
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