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    Apter Power provides factory-original Allen-Bradley 1769-ASCII modules to reliably expand your CompactLogix serial communications and eliminate system integration bottlenecks.

1769-ASCII

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The Allen-Bradley 1769-ASCII Compact Module provides a flexible network interface to a wide variety of RS-232, RS-485, and RS-422 ASCII devices by establishing critical communication connections.
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Technical specifications for 1769-ASCII

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1769-ASCII
  • Product Family:
    CompactLogix
  • Product Type:
    Compact Module
  • Stock:
    1
  • Bus Current:
    425 mA @ 5V dc
  • Power Dissipation, Max.:
    2.13 W
  • Thermal Dissipation, Max.:
    7.3 BTU/hr
  • Power Supply Distance Rating:
    4
  • Isolation Voltage:
    30V Tested to withstand 710V dc for 60 s
  • Serial Port:
    TX FIFO overflow, RX FIFO overflow, RX parity error, handshake error, new data flag
  • Weight:
    0.18 kg
  • Estimated shipping dimensions:
    8.7x3.4x11.8cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Use Cases Installation & Integration Compatibility & Interoperability

Features:

  • Communications Interface Link for ASCII Serial Devices to 1769 Controllers
  • Provides Two Isolated Serial Channels with Multi-Protocol Standard Support
  • Integrates Directly with CompactLogix Controllers and MicroLogix 1500 Systems
The Allen-Bradley 1769-ASCII operates as a specialized serial communication module in a 1769 Compact I/O system, providing direct data exchange with a wide variety of ASCII-compatible field devices. It receives communication signals from external serial units and transfers parsed data across the 1769 backplane to enable seamless processing inside the controller memory. Operating with a 425 mA bus current draw at 5V DC and 2.13 W maximum power dissipation, the module draws all required operating power directly from the backplane without an external power supply. Independent channel configuration is standard on the 1769-ASCII, allowing both DB-9 male ports to communicate simultaneously in alternating or dual mode using distinct communication parameters.

The 1769-ASCII provides essential serial connectivity across the local I/O bus, directly enabling the control system to interface with third-party peripherals such as barcode readers, vision sensors, weigh scales, and RFID scanners. A single module handles up to two independent channels, expanding system connectivity without adding separate network gateways. The module occupies a single slot on the 1769 DIN-rail or panel setup and must be installed within a power supply distance rating of four modules from the system power supply.

For dual-port serial applications, the 1769-ASCII module utilizes Port 1 (configured for RS-232 or RS-422) and Port 2 (configured for RS-485) to communicate with distinct device networks. In addition to standard single-port operation, the dual-channel configuration performs hardware-handshaking using RTS/CTS signals. Using this method, the 1769-ASCII continuously monitors communication health via real-time status flags. If the module detects transmission issues, it updates dedicated diagnostic flags—including TX/RX activity, FIFO buffer overflow, parity error, handshake error, and new data indicators—directly in the controller backplane tags.

The 1769-ASCII Allen-Bradley Compact Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1769-ASCII Compact Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1769-ASCII Compact Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1769-ASCII
  • Condition New Original ready stock
  • Product Family 1769-ADN,1769-L30ER
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Product Traceability: It feeds data from inline barcode scanners, 2D matrix readers, and RFID antennas straight into the controller tag database.
  • Weighing Operations: It links directly to digital weigh scales and industrial laboratory balances to capture precision weight metrics.
  • Legacy Displays & Printers: It pushes string commands out to industrial marquee signs, status displays, or alphanumeric ticket printers.
  • 1. Mounting: Snap the module securely onto a heavy-duty DIN rail or fasten it directly to an enclosure backpanel.
  • 2. Bus Connection: Slide the module alongside the existing controller setup using the built-in guide slots. Slide the bus lever firmly to the left to lock the backplane connector.
  • 3. Field Wiring: Attach your serial cables to the removable terminal block. The removable design lets you swap modules later without rewriting the physical connections.
  • Physical Interfacing: Each channel supports three electrical standards : 1.RS-232: Ideal for point-to-point, short-range connections (under 15 meters). 2.RS-422: Ideal for longer-distance, four-wire differential communication. 3.RS-485: Ideal for multi-drop, two-wire network layouts.
  • Supported Systems: The unit functions across standard 1769 backplanes, making it compatible with: 1.CompactLogix 5370 controllers (L1, L2, and L3 platforms). 2.Legacy CompactLogix controllers (1769-L2x and 1769-L3x). 3.MicroLogix 1500 controller bases.
Description
The Allen-Bradley 1769-ASCII Compact Module is a  communication module engineered to bridge Allen-Bradley CompactLogix and MicroLogix 1500 control systems with standard serial devices. Featuring two individually isolated serial channels equipped with DB-9 male connectors, the 1769-ASCII module enables simultaneous, independent communication across RS-232, RS-422, and RS-485 interfaces. The 1769-ASCII module operates in alternating or dual simultaneous modes without requiring external power, relying entirely on the 1769 backplane bus (425 mA at 5V DC) while maintaining strict isolation to protect control networks against electrical noise and ground loops.

This Allen-Bradley 1769-ASCII Compact Module is specifically designed to solve the challenge of seamlessly integrating non-ethernet legacy serial peripherals into modern PLC architectures without relying on complex, external protocol converters. By directly handling raw ASCII string transmission, parsing, and error tracking—including status monitoring for FIFO buffer overflow, parity errors, and handshake failures—the 1769-ASCII module eliminates data bottlenecks, prevents data loss, and simplifies string manipulation directly within the controller's memory.

In industrial environments, the 1769-ASCII module is widely applied across factory automation, packaging, logistics, and material handling systems. Typical application scenarios involve linking CompactLogix controllers to automated barcode readers on high-speed conveyor lines, inline digital weigh scales, industrial RFID tags, printer units, and vision inspection equipment. Through its RTS/CTS hardware handshaking and robust serial signal range (3–25V DC), the 1769-ASCII module delivers reliable data capture essential for real-time track-and-trace operations and inventory verification.
Revisions

Revision Part #

Also known as

1769-ASCII Ser A
1769-ASCII/A, Series A, Rev A
Alternative Names
1769-ASC11 1769-ASC1I 1769-ASCI1 1769ASC11 1769ASC1I 1769ASCI1
Technical notes
The Allen-Bradley 1769-ASCII features two individually isolated DB-9 male serial ports that can operate simultaneously with independent configurations, supporting RS-232/RS-422 on Port 1 and RS-485 on Port 2.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What problem does the 1769-ASCII solve?
The module enables communication between modern PLCs and legacy ASCII devices, eliminating data compatibility issues and simplifying serial device integration.
What devices can be connected to the 1769-ASCII?
The module can communicate with barcode readers, RFID readers, weighing scales, serial printers, and other industrial devices that use the ASCII communication protocol.
What communication features does the 1769-ASCII provide?
The module supports RTS/CTS hardware handshaking and provides status indicators for data transmission, FIFO operation, receive errors, parity errors, handshake errors, and new data detection.

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