Allen-Bradley 1734-232ASC POINT I/O ASCII Communication Module

Product Overview

The Allen-Bradley 1734-232ASC is a POINT I/O ASCII communication module from the 1734 POINT I/O family. It provides a single full-duplex RS232 interface for connecting ASCII devices like barcode readers in manufacturing lines. This module helps reduce wiring costs and simplifies integration by using a compact, DIN-rail mounted design that minimizes panel space. With support for multiple serial character framings and communication speeds, it offers flexibility for various automation tasks without requiring expensive protocol converters.

Technical Specifications Breakdown

Key parameters for the 1734-232ASC are listed below for quick reference:

Industry Applications

This module is commonly used for interfacing barcode readers in point-of-sale systems or manufacturing lines. By automating product sorting and quality assurance, it reduces labor costs and minimizes errors. For example, a packaging line can use the 1734-232ASC to read barcodes at high speed, ensuring correct labeling and reducing waste. The cost savings from fewer mis-sorts and less downtime quickly offset the module's price.

Installation & Setup Guidance

Mount the module on a 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS wiring base assembly. Set the keyswitch to position 6 (or position 2 as noted in some references). Connect the RS232 device using a full-duplex cable. Configure the serial port parameters—character framing and baud rate—to match the connected device. The module accepts +3 to +25V dc as a space signal and -3 to -25V dc as a mark signal. Ensure the external DC supply is within 10-28.8V dc.

Maintenance & Reliability

The open-style enclosure requires periodic inspection for dust and moisture. Keep the operating environment within -20 to 55°C and humidity below 95% non-condensing to ensure reliable communication. The module's low power dissipation (0.75W max) reduces heat buildup, extending component life and lowering cooling costs.

Compatibility & Integration

This module works with DeviceNet, EtherNet/IP, and PROFIBUS DP adapters. It supports DeviceLogix technology for local control and change-of-state connections for efficient data transfer. The RIUP feature allows hot swapping without powering down, minimizing production interruptions. This compatibility reduces integration costs by using existing network infrastructure.

Selection Guide & Purchasing Advice

When selecting the 1734-232ASC, verify your application's communication speed and framing requirements. The module supports speeds up to 38.4k baud and nine framing options, covering most ASCII devices. For cost-effective automation, this module eliminates the need for separate serial-to-network converters. Contact AutoDCSTech for current lifecycle status and availability before ordering.

Troubleshooting & Common Issues

If communication fails, check the RS232 cable wiring and ensure the device's baud rate and framing match the module settings. Verify the external DC supply voltage is within 10-28.8V dc. Use the status LEDs: green/red for module and network status, and green TXD/RXD for transmit/receive activity. A solid red module status indicates a fault; power cycle the module and check connections.