Honeywell 621-9938 | IPC 620/621 Serial Communication Module

Manufacturer: Honeywell
Part Number: 621-9938
Condition：New with Original Package
Product Type: Serial Communication Module
Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months

Honeywell 621-9938 Serial I/O Module (SIOM) Overview

The Honeywell 621-9938 is a dual-port Serial I/O Module engineered for IPC 620/621 control systems. It enables seamless communication between the controller and serial-based field devices, including sensors, actuators, HMIs, and printers.

With support for multiple serial protocols and advanced diagnostics, this module ensures reliable data transfer, fast response, and high flexibility in industrial automation environments. Front-panel LEDs provide real-time status and fault indicators, simplifying monitoring and maintenance.

Technical Specifications

Feature	Description
Model Number	621-9938
Type	Serial I/O Module (SIOM)
Communication Ports	Dual RS-232 / RS-485 serial ports
Supported Protocols	Modbus RTU, ASCII, proprietary Honeywell protocols
Number of Channels	16 digital input/output channels
Power Supply	24 VDC input voltage
Operating Temperature	–40°C to +70°C industrial-grade range
Diagnostics	Front-panel LEDs for status and fault indication
Mounting	Rack-mounted within IPC 620/621 chassis
Isolation	Electrical isolation between ports and system bus
Dimensions	Standard IPC module size, compact footprint
Weight	1.54 lbs (0.70 kg)
Certifications	CE compliant; meets industrial automation standards
Warranty	Typically 12 months from authorized distributors

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