1769-ASCII | Allen-Bradley ASCII Communication Module Supplier

1769-ASCII Product Introduction

When factory automation demands seamless integration of ASCII-based devices like barcode readers, the 1769-ASCII provides a reliable interface. This specialty module from Allen-Bradley is part of the CompactLogix family and is engineered to exchange data via ASCII protocol. It offers two individually isolated ports that can be configured for RS-232, RS-422, or RS-485 communication, enabling simultaneous operation with different device sets.

With a power supply distance rating of 4 modules, the 1769-ASCII must be installed within four modules of the CompactLogix power supply. It is backplane powered and does not require an external supply, simplifying installation in both CompactLogix and MicroLogix 1500 systems.

Key Features & Technical Specs

• Manufacturer: Rockwell Automation / Allen-Bradley, part number 1769-ASCII.
• Product type: Specialty module, module type Communication Interface Module.
• Mounting options: Chassis mount, DIN Rail, or Panel.
• Power rating: 425 mA at 5 VDC, with maximum power dissipation of 2.13 Watts.
• Thermal dissipation: 7.3 BTU/hr, ensuring efficient heat management.
• Operating temperature range: 0 to 62 °C (32 to 140 °F).
• Isolation voltage: 30 Volts continuous, tested to withstand 710 VDC for 60 seconds.
• Handshaking: RTS/CTS hardware handshaking enabled for reliable data flow.
• Serial input voltage signal: 3 to 25 VDC for asserted state, -3 to -25 VDC for disasserted state.
• Number of inputs: 2 full duplex (RS-232, RS-422) and 2 half duplex (RS-485).
• Input words: 108; configuration words: 31.
• Backplane current: 1.4 Amps at 24 Volts; power consumption: 33.6 Watts.
• Shipping weight: 2 lbs; shipping dimensions: 8 x 8 x 5 inches.

Unique Insight: The dual-port design with independent configuration allows simultaneous communication with different ASCII devices, reducing the need for additional modules and lowering system cost.

Cost-Benefit & ROI

By integrating the 1769-ASCII, engineers can connect multiple ASCII devices through a single module, minimizing hardware investment. Its low power dissipation of 2.13 Watts and thermal dissipation of 7.3 BTU/hr contribute to reduced energy costs over the product's lifespan. The module's compatibility with existing CompactLogix and MicroLogix 1500 systems eliminates the need for costly controller upgrades, delivering a strong return on investment.

Applications & Use Cases

In factory automation, the 1769-ASCII is commonly used to interface with barcode readers, scanners, and other ASCII-based peripherals. For example, in a packaging line, it can capture product data from multiple scanners simultaneously, improving throughput. Its robust temperature range of 0 to 62 °C suits harsh industrial environments, while the RTS/CTS handshaking ensures error-free data transmission.

Installation & Setup

Mount the 1769-ASCII on a DIN rail or panel using the chassis mount option. Ensure it is placed within four modules of the CompactLogix power supply to meet the distance rating. Connect the DB-9 male serial ports to ASCII devices using recommended Belden 8761 shielded cable for optimal signal integrity. No external power supply is needed as the module is backplane powered.

Maintenance & Reliability

Regularly inspect the module for dust accumulation and verify that all connections are secure. The 1769-ASCII is designed for long-term reliability with a thermal dissipation of 7.3 BTU/hr, reducing heat-related wear. Operating within the specified temperature range of 0 to 62 °C extends service life, minimizing downtime and maintenance costs.

Compatibility & Integration

The 1769-ASCII is compatible with 1769 CompactLogix controllers and MicroLogix 1500 controllers. It supports RS-232, RS-422, and RS-485 protocols, allowing integration with a wide range of ASCII devices. The module's two individually isolated ports can be configured independently, enabling flexible system design.

FAQ about 1769-ASCII

Q: What is the power supply distance rating for the 1769-ASCII?

A: The module has a CompactLogix power supply distance rating of 4, meaning it must be installed within four modules of the power supply.

Q: What serial protocols does the 1769-ASCII support?

A: It supports RS-232, RS-422 (full duplex) and RS-485 (half duplex) with 2 inputs each.

Q: What is the maximum power dissipation of the 1769-ASCII?

A: The maximum power dissipation is 2.13 Watts, with a thermal dissipation of 7.3 BTU/hr.

Q: What is the operating temperature range for the 1769-ASCII?

A: The operating temperature range is 0 to 62 °C (32 to 140 °F).

Q: Does the 1769-ASCII require an external power supply?

A: No, it is backplane powered and does not require an external power supply.

Q: What type of cable is recommended for the 1769-ASCII?

A: Belden 8761 shielded cable is recommended for serial connections.

Product Support & Availability

The 1769-ASCII is a current product and available in stock at Petro Auto Tech. Contact our team for pricing and lead times. We offer fast shipping to support your automation projects.