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

Introduction

When a manufacturing line requires reliable ASCII communication with barcode readers or serial printers, the Allen-Bradley 1734-232ASC provides a compact and flexible solution. This POINT I/O module bridges the gap between control systems and ASCII devices, enabling automated sorting and quality assurance without complex programming.

Technical Specifications

The 1734-232ASC operates with an external DC voltage range of 10-28.8V dc and a nominal supply voltage of 24V DC. It draws a supply current of 15mA @ 24V dc and has a POINTBus current draw of 75 mA max @ 5 VDC. Power dissipation is 0.75W maximum @ 28.8V dc, with thermal dissipation of 2.5 BTU/hr maximum @ 28.8V dc. The module supports serial character framings including 7N2, 7E1, 7O1, 8N1, 8N2, 8E1, 8O1, 7E2, and 7O2, and communication speeds of 9600, 1200, 2400, 4800, 19.2k, and 38.4k baud. It accepts +3 to +25V dc as a logic 0 (asserted) and -3 to -25V dc as a logic 1 (disasserted).

Industry Applications

In point-of-sale environments, the 1734-232ASC interfaces barcode readers to track inventory in real time. On manufacturing lines, it connects to scanners for automated product sorting and quality assurance, reducing manual errors. The module's full-duplex RS232 port and configurable framing make it suitable for legacy serial devices that require 7- or 8-bit data with parity.

Installation & Setup Guidance

Mount the 1734-232ASC on a 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS wiring base assembly. Set the keyswitch to position 2 before installation. Connect the external DC power supply within the 10-28.8V dc range. The module supports removal and insertion under power (RIUP), allowing replacement without powering down the machine. Configure the serial port parameters (baud rate, framing, start/end delimiters) using the control system software.

Maintenance & Reliability

The 1734-232ASC operates in temperatures from -20 to 55°C and storage from -40 to 85°C, with 5% to 95% non-condensing humidity. Its open-style enclosure requires installation in a clean, dry cabinet. Periodically inspect the wiring base and connections for corrosion or looseness. The module's fault protection at 28.8V dc helps prevent damage from overvoltage.

Compatibility & Integration

The 1734-232ASC integrates with POINT I/O systems using DeviceNet, EtherNet/IP, or PROFIBUS DP adapters. It works with Rockwell Automation controllers that support POINTBus backplane communication. The module supports change-of-state connections and auto device replacement (ADR) for easy network expansion.

Selection Guide & Purchasing Advice

Before ordering the 1734-232ASC, verify that your wiring base assembly is compatible (1734-TB, -TBS, -TOP, or -TOPS). Ensure the external power supply provides 24V DC nominal within the 10-28.8V dc range. For complete technical specifications, contact BluePLC Industrial. We stock genuine Allen-Bradley modules and can advise on replacement options if needed.