HONEYWELL DCOM-232/485

Overview

HONEYWELL DCOM-232/485, commonly ordered as FC-DCOM-232/485 or FS-DCOM-232/485, is a Honeywell communication interface module used to add RS-232 and RS-485/422 serial communication capability to Honeywell control and safety systems. The module acts as an add-on serial interface, enabling the Honeywell Safety Manager or compatible control processor to connect to external serial devices, monitoring systems, industrial computers and field automation equipment. It supports communication status monitoring and fault diagnostics for serial links in industrial control cabinets. As a legacy Honeywell DCS and safety system interface component, it is widely traded as an MRO spare for existing Honeywell controller installations.

Features

HONEYWELL DCOM-232/485 provides selectable RS-232 and RS-485/422 serial outputs. The RS-232 output complies with EIA/TIA-232 signal levels, while the RS-485/422 output complies with EIA/TIA-485-A levels. The RS-232 baudrate range covers 0 to 250 kBaud, and the RS-485/422 baudrate range covers 0 to 2 MBaud, supporting transparent, FM0, FM1 or Manchester coding on the serial link. The module is powered from the control processor at 5 VDC plus or minus 5 percent, with a maximum input current of 500 mA, so it is designed as a rack- or DIN-rail mounted interface rather than a standalone converter.

The module supports communication status monitoring and fault diagnostics, helping engineers identify serial link failures, wiring problems or device communication faults during commissioning and maintenance. It mounts on TS32 or TS35 x 7.5 DIN rails or inside a control cabinet. Approvals include CE, TUV, UL and FM, supporting use in industrial automation and safety-related control environments. The compact housing suits Honeywell control chassis and spare parts replacement in existing systems.

Specs

Product series: Honeywell DCOM communication interface module Model: HONEYWELL DCOM-232/485, also FC-DCOM-232/485 and FS-DCOM-232/485 Type: Serial communication interface module for Honeywell control and safety systems Communication interfaces: RS-232, RS-485/422 RS-232 signal level: EIA/TIA-232 compliant RS-232 baudrate: 0 to 250 kBaud RS-485/422 signal level: EIA/TIA-485-A compliant RS-485/422 baudrate: 0 to 2 MBaud Serial coding: Transparent, FM0, FM1, Manchester Input voltage: 5 VDC plus or minus 5 percent Input current: Maximum 500 mA, supplied by the control processor Diagnostics: Communication status monitoring and fault diagnostics Mounting: TS32 / TS35 x 7.5 DIN rail or cabinet mounting Dimensions: 110 x 70 x 61 mm Weight: Approximately 0.449 kg Approvals: CE, TUV, UL, FM Operating temperature: 0 to 60 degrees Celsius Storage temperature: -40 to 85 degrees Celsius Relative humidity: 5 to 95 percent non-condensing Product status: Legacy Honeywell DCS and safety system spare, industrial MRO replacement component

Principle

HONEYWELL DCOM-232/485 works as a serial interface bridge between the Honeywell control processor and external serial equipment. The control processor supplies power and exchanges internal data with the module through the system backplane or module connection. When configured for RS-232, the module converts internal system communication to EIA/TIA-232 levels for point-to-point connection to a serial device, programming port or industrial computer. When configured for RS-485/422, it drives EIA/TIA-485-A differential signals for multi-drop or longer-distance field communication. The module monitors link status and reports communication or fault diagnostic information to the control system, enabling operators and maintenance engineers to verify serial communication and locate faults. Serial coding such as FM0, FM1 or Manchester is handled according to the connected device and system configuration.

Applications

HONEYWELL DCOM-232/485 is used in Honeywell Safety Manager and compatible control processor installations that require RS-232 or RS-485/422 serial connections to external systems. It fits process control, manufacturing lines, energy management, plant monitoring, chemical and petrochemical plants, power and utilities, water and wastewater, sugar mill and pulp mill automation, and other industrial DCS or safety-related control cabinets. In existing systems originally equipped with the DCOM-232/485 module, it serves as a direct replacement spare for communication interface maintenance, compatible with the original Honeywell controller mounting and serial wiring.