Allen-Bradley 1734-485ASC Serial Interface Module Introduction

The Allen-Bradley 1734-485ASC is a robust Serial Interface Module from Rockwell Automation's POINT I/O series. This module provides a vital DeviceNet interface for connecting to various ASCII devices over RS-485 or RS-422 networks. For complete installation and configuration details, we highly recommend downloading the official product manual. Download the POINT I/O ASCII Modules Manual Here

Technical Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Model / Catalog Number: 1734-485ASC
• Series: POINT I/O
• Module Type: Serial Interface Module
• Voltage Range: 10 to 28.8 Volts DC
• Nominal Supply Voltage: 24 Volts DC
• Supply Current: 15mA at 24V DC
• Key Switch Position: 2
• Network Support: RS-485 (2-wire) and RS-422 (4-wire)

Installation and Wiring Guidelines

• Always use shielded communication cables to protect signal integrity.
• Ground the cable shield at only one end to prevent ground loop faults.
• Connect the shield directly to the DIN rail, not the terminal block.
• The removable terminal block on the 1734-485ASC does not support a chassis ground connection.
• Make all wiring connections to the designated points on the 1734-TB terminal block.

Configuration and Data Handling

• You must set up the ASCII module's buffer sizes after powering the device.
• The default buffer size for both receiving and transmitting is 20 bytes.
• You can modify the buffer size in the configuration file for larger data packets.
• The module sends data to the serial device only after meeting specific conditions.
• It transfers data when it reaches the defined buffer length or detects an end-of-string terminator.

Packaging and Shipping

• Each unit comes securely packaged with the 1734-485ASC module.
• We ship all orders via reliable global carriers like FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

• What networks does this module support?
• It supports both RS-485 (2-wire) and RS-422 (4-wire) networks.
• How should I ground the shield?
• Ground the cable shield at the DIN rail only, not at both ends.
• Can I change the data buffer size?
• Yes, you can reconfigure the I/O message and buffer sizes from their defaults.

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