Honeywell 51303932-476 Serial Interface Modbus EIA-232 FTA

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Manufacturer: Honeywell
Product No.: 51303932-476
Country of origin:United States
Product Type: Serial Interface Modules
Payment: T/T, Western Union
Weight: 320g
Dimensions: 15.2 cm x 12.0 cm x 8.2 cm
Shipping port: Xiamen
Warranty: 12 months

Description

Providing reliable industrial communication link capability, the Honeywell 51303932-476 serves as a dedicated Serial Interface Modbus EIA-232 Field Termination Assembly (FTA) within integrated Honeywell control architectures. This high-reliability module enables seamless point-to-point communication between Honeywell control networks (such as TDC 3000 and Experion systems) and external Modbus-compatible subsystems. By using standardized serial layers, it ensures deterministic register mapping and robust data transfer for critical process automation applications.

Key Features

Protocol Compliance: Natively supports standard Modbus RTU/ASCII protocols for consistent third-party system integration.
Physical Interface: Complies with EIA-232 (RS-232) electrical standards, optimized for dedicated point-to-point communication.
Dual Connection Infrastructure: Equipped with both a DB25 port and compression terminal blocks to match site-specific wiring standards.
Single-Channel Isolation: Dedicated single-channel path optimizes data throughput while limiting the propagation of electrical faults.

Industrial Applications

Interfacing distributed control systems (DCS) with external programmable logic controllers (PLCs).
Linking remote gas chromatographs, flow meters, and analytical equipment to the central control room.
Integrating heavy machinery vibration monitoring systems and power distribution monitors with legacy control architectures.

Technical Specifications

Parameter	Specification value
Manufacturer	Honeywell
Model Number	51303932-476
Product Type	Serial Interface Modbus EIA-232 FTA
Interface Standard	EIA-232 (RS-232)
Number of Channels	1 Channel
Terminal Types	DB25 or Compression Screw Terminals
Module Size Classification	Size A (6 inches / 152 mm)
Physical Dimensions	15.2 cm x 12.0 cm x 8.2 cm
Net Weight	0.32 kg
Shipping Weight (Calculated)	1.50 kg

Engineering Field Notes

Alternative Models and Compatibility

The 51303932-476 matches the standard form-factor for Size A field termination assemblies in Honeywell Serial Interface Module (SIM) installations. It acts as a direct pin-compatible unit for legacy serial configurations, but always verify module jumper configuration alignments when hot-swapping older revisions of the SI board.

Application Pitfalls and Noise Immunity

Because EIA-232 uses single-ended signals referenced to a common ground, it is highly susceptible to ground loop currents and electromagnetic interference (EMI). Keep the cable distance under 15 meters (50 feet) and ensure the shield is grounded at only one end to prevent potential ground loops between the FTA and external slave nodes.

Commissioning and Wiring Tips

When using the compression terminal blocks, refer closely to the pin map to separate signal ground from protective earth ground. If you are experiencing constant communication timeouts (Modbus Code 4 or general framing errors), double-check if your external peripheral requires a null-modem configuration (swapped RX/TX pins) versus a straight-through pinout mapping.

Installation Guidelines

CRITICAL WARNING: De-energize all power sources supplying the host system and interface racks before inserting, removing, or wiring the Field Termination Assembly. Failure to isolate power can result in system damage or unexpected interruption of control bus operations.

Mount the Size A board securely onto the designated enclosure chassis using the integrated mounting guides.

Choose either the DB25 connector or the compression screw terminal block for the serial interface link. Do not connect signals to both ports simultaneously.

Connect the communication cable shield directly to the shield terminal clamp to minimize high-frequency ambient noise interference.

Restore power to the interface racks and configure the corresponding Modbus registers on the host console to establish communication.

Key Features:

#Serial Interface Modules

Can I use both the DB25 port and the compression terminals simultaneously?

No. The DB25 and compression terminal connections share the same physical channel. Connecting devices to both ports concurrently will cause signal interference and prevent stable communications.

What is the maximum cable length supported by this EIA-232 interface?

Following the EIA-232 standard, cabling should be restricted to a maximum length of 15 meters (50 feet) without inline line-drivers or active signal extenders.

Does this module require an external power supply to run?

No. The FTA draws its required operational power through its native bus connections from the host Honeywell Serial Interface Module (SIM).

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TECHNICAL SPECIFICATIONS

Country of origin

Honeywell 51303932-476 Serial Interface Modbus EIA-232 FTA