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1769-ASCII Allen-Bradley Communication Interface Module

1769-ASCII Allen-Bradley Communication Interface Module

Product Description

The 1769-ASCII (Part Number: 1769-ASCII) is a specialized serial communication module designed for the CompactLogix and MicroLogix 1500 platforms. It enables seamless integration between the PLC backplane and third-party peripherals that utilize the American Standard Code for...

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SKU: 1769-ASCII
Vendor: Allen Bradley
Category: Communication Interface Module
Related Series:

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Product Description

The 1769-ASCII (Part Number: 1769-ASCII) is a specialized serial communication module designed for the CompactLogix and MicroLogix 1500 platforms. It enables seamless integration between the PLC backplane and third-party peripherals that utilize the American Standard Code for Information Interchange (ASCII) protocol. This module is essential for applications requiring data exchange with non-networked industrial equipment, such as barcode scanners, weigh scales, RFID readers, and serial printers.

Featuring two independently isolated ports, the 1769-ASCII provides significant installation flexibility. Each channel can be configured to operate concurrently with unique baud rates and data formats. Port 1 supports RS-232, RS-422, and RS-485 physical interfaces, while Port 2 is optimized for RS-485 communication. The module manages the complex task of serial buffering and framing, allowing the controller to focus on high-level logic execution while receiving or transmitting character strings.

Technical Specifications

Specification Details
Module Type Specialty ASCII Communication Interface
Number of Channels 2 Individually Isolated Ports
Port 1 Protocols RS-232, RS-422, RS-485
Port 2 Protocols RS-232, RS-422, RS-485
Isolation 710V DC for 1 minute (Port-to-Bus and Port-to-Port)
Backplane Current 425 mA at 5V DC
Baud Rate Support 300 to 38,400 bps
Data Formatting 7 or 8 data bits; Even, Odd, or No parity
Operating Modes Alternating mode or Dual Simultaneous mode
Internal Buffer 128 characters per port (receive/transmit)
Operating Temperature 0 to 60 °C (32 to 140 °F)
Dimensions 118 mm x 35 mm x 87 mm (HxWxD)

Application Scenarios

The 1769-ASCII is primarily deployed in:

  • Warehouse automation for reading barcode data into a tracking database

  • Manufacturing cells where legacy serial devices need to report diagnostic strings to a modern CompactLogix controller

  • Laboratory instrumentation or specialized environmental sensors

Frequently Asked Questions

Can I use Port 1 and Port 2 for different protocols at the same time?

  • Yes, the ports are individually isolated and independent. You can configure Port 1 for RS-232 communication with a scanner, while Port 2 operates as an RS-485 link to a remote display.

What cables are required for the connection?

  • The module uses a standard terminal block connector. Wiring should follow the pinout diagrams for RS-232, RS-422, or RS-485 as specified in the 1769-ASCII user manual, ensuring proper shielding for industrial environments.