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Allen Bradley

Allen-Bradley 1785-KE Data Highway Plus Communication Interface Module

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ManufacturerAllen Bradley

Part number1785-KE

DH+ Data Rate 57.6 kbps

RS-232-C Baud Rates 110-19,200 baud

Serial Mode Full-duplex or half-duplex

Mounting 1771 I/O chassis

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12-month warranty

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Veteran-owned

CAGE: 9NK75

Links RS-232-C devices to DH+ networks Supports selectable baud rates Half/Full-duplex operation 1.2A backplane current draw 0-60°C operating temperature

Product description

The Allen-Bradley 1785-KE is a communication interface module designed to bridge asynchronous RS-232-C devices with a Data Highway Plus (DH+) network. It enables industrial controllers and intelligent serial equipment to exchange data across distributed automation systems. This module supports communication rates of 57600 bits per second for DH+ and switch-selectable speeds for RS232 from 110 to 19200 bits per second. It can operate in half-duplex or full-duplex modes.

This module is commonly used in PLC-5 installations where legacy devices need to communicate reliably through a DH+ network infrastructure. It is ideal for connecting Programmable Logic Controllers (PLCs) to computers or other devices, enabling data exchange and control in factory automation and process control systems. Its robust design ensures dependable operation in demanding industrial communication environments.

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Technical specifications

DH+ Data Rate	57.6 kbps
RS-232-C Baud Rates	110-19,200 baud
Serial Mode	Full-duplex or half-duplex
Mounting	1771 I/O chassis
Backplane Current Draw	1.2 A @ 5VDC
Operating Temperature	0-60°C
Storage Temperature	-40-85°C
Relative Humidity	5-95% non-condensing

Common applications

Factory Automation

Process Control Systems

PLC Integration

Data Acquisition

Legacy System Upgrade

Compatible systems

PLC-2 PLC-3 PLC-4 PLC-5 Intelligent RS-232-C devices

Also known as

1785KE Allen-Bradley DH+ Module PLC-5 Communication Module

Replaces / compatible with

Replaces 1785-KD and 1785-KC communication controller modules.

Technical note

Expert tip

Requires a 1770-CD cable for DH+ connection and a 1770-CG or 1770-CP for the RS-232-C port.

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Frequently asked questions

What is the communication speed of the Allen-Bradley 1785-KE module?

The Allen-Bradley 1785-KE module supports a Data Highway Plus (DH+) speed of 57600 bits per second. For the RS-232-C port, it offers switch-selectable speeds ranging from 110 to 19200 bits per second.