Honeywell FC-DCOM-234/485 Interface Module

Versatile Serial Communication Bridge

The FC-DCOM-234/485 serves as a high-performance interface module for the Honeywell Safety Manager platform. This module creates a seamless bridge between the control system and Modbus RTU or ASCII-based serial networks. It supports RS-232, RS-422, and RS-485 communication protocols to suit diverse field devices. Consequently, the module enables data exchange with third-party analyzers, flow computers, and remote terminal units.

Protocol Handling and Serial Configuration

The FC-DCOM-234/485 incorporates a dedicated 32-bit processor for handling real-time protocol conversion. This processor manages the Modbus master or slave functionality according to system configuration settings. The module stores message routing tables and timeout parameters within its onboard flash memory. Additionally, it provides comprehensive error-checking mechanisms like CRC-16 verification for robust data integrity. The module also buffers up to 256 bytes of transmit and receive data per port .

Field Wiring and Connectivity Options

The module features a 40-pin terminal block for all field connections and power distribution . This block accepts screw-clamp connections and supports wire gauges from 12 to 24 AWG . A 9-pin D-sub connector provides the primary RS-232 interface for direct device connection. Meanwhile, a removable screw terminal block houses the RS-485 signals and termination resistor configurations. The module supports baud rates from 300 up to 115.2 kbps for flexible network integration.

Technical Specifications