Allen-Bradley 1769-ASCII Communication Module Overview

The Allen-Bradley 1769-ASCII is an ASCII communication interface module. Specifically, it belongs to the CompactLogix product line from Rockwell Automation. Therefore, this module connects ASCII compatible devices to control systems. Consequently, users select the 1769-ASCII for barcode readers and serial printers. Moreover, the module works with both CompactLogix and MicroLogix 1500 controllers. Finally, it mounts on a DIN rail or directly on a panel.

Technical Specifications of 1769-ASCII

The Allen-Bradley 1769-ASCII has two individually isolated ASCII ports. Specifically, port one handles RS232 or RS422 in full duplex mode. Port two handles RS485 in half duplex mode independently. Each port can operate simultaneously with different configurations. The module supports alternating mode or dual simultaneous mode. RTS/CTS hardware handshaking is enabled for flow control.

Backplane current draw is 1.4 Amps at 24 Volts. Power consumption reaches 33.6 Watts total. The module draws 425 mA at 5 Vdc from the bus. Maximum power dissipation is 2.13 Watts. Thermal dissipation measures 7.3 BTU per hour. Isolation voltage is 30 Volts continuous. The module tests to withstand 710 Vdc for 60 seconds.

The 1769-ASCII uses 108 input words for data exchange. Configuration requires 31 words of memory space. Serial input voltage signal ranges from 3 to 25 Vdc for active state (Space). For inactive state (Mark), the signal ranges from -3 to -25 Vdc. Recommended cable is Belden 8761 shielded type. Operating temperature ranges from 0°C to 62°C (32°F to 140°F). Storage temperature ranges from -40°C to 85°C.

Relative humidity tolerance is 5% to 95% non-condensing. Operating vibration withstands 5g at 10 to 500 Hz. Operating shock tolerance is 30g. Non-operating shock tolerance reaches 50g. Module dimensions are 87 mm x 34 mm x 118 mm. Weight is 0.18 kg (0.4 lbs) for easy mounting.

The 1769-ASCII has a power supply distance rating of 4 modules. Install this module within four slots of the power supply. The module is backplane powered for simple wiring. No external power supply is required. Serial port status indicators include TX FIFO overflow. Also includes RX FIFO overflow and RX parity error. Handshake error and new data flag are also monitored.

Installation Guidelines for Allen-Bradley 1769-ASCII

First, mount the 1769-ASCII on a DIN rail or panel. Then, snap the module onto the rail until it locks. After that, connect the module to adjacent CompactLogix units. Next, connect your ASCII device to the DB-9 male ports. Subsequently, apply power to the CompactLogix power supply. Finally, configure each port using RSLogix 5000 software.

First, verify the module is within 4 slots of the power supply. Then, use Belden 8761 shielded cable for all connections. After that, set the port configuration for RS232, RS422, or RS485. Next, enable RTS/CTS handshaking if needed. Do not exceed the 30V isolation voltage between ports. Finally, test communication with your ASCII device before full operation.

Package Contents of 1769-ASCII

Your shipment includes these items:

One Allen-Bradley 1769-ASCII ASCII communication module

One DIN rail mounting clip (pre-installed)

One product installation instructions manual

However, the package does not include any DB-9 cables. Therefore, you must purchase cables separately. Also, no Belden 8761 cable is provided with this module. Finally, configuration software is not included in the shipment.

Frequently Asked Questions about 1769-ASCII

1. What controllers work with the 1769-ASCII module?

The Allen-Bradley 1769-ASCII works with CompactLogix controllers. Specifically, it also works with MicroLogix 1500 systems. Therefore, check your controller model before ordering. The module mounts beside the base unit or adjacent modules.

2. What is the power supply distance rating for 1769-ASCII?

The 1769-ASCII has a power supply distance rating of 4 modules. Specifically, install this module within four slots of the power supply. Therefore, maintain proper spacing for reliable operation. Exceeding this distance may cause power issues.

3. Can both ports on the 1769-ASCII operate simultaneously?

Yes, the Allen-Bradley 1769-ASCII supports dual simultaneous mode. Specifically, each port operates independently with different configurations. Therefore, you can connect two different ASCII devices at once. Port one handles RS232 or RS422. Port two handles RS485 exclusively.

4. What type of cable works best with the 1769-ASCII?

The 1769-ASCII recommends Belden 8761 shielded cable. Specifically, this cable reduces electrical noise interference. Therefore, use shielded cable for reliable long distance communication. Keep cable runs as short as practical for your application.

5. What is the isolation voltage rating on this module?

The Allen-Bradley 1769-ASCII has 30V continuous isolation voltage. Specifically, it tests to withstand 710 Vdc for 60 seconds. Therefore, the ports are isolated from the backplane. This protects the controller from field wiring faults.

Compatibility and Application Notes

The Allen-Bradley 1769-ASCII is a current product from Rockwell Automation. Specifically, it belongs to the 1769 CompactLogix family. Use this module for barcode readers, weigh scales, and serial printers. The two ports support both full duplex and half duplex communication. UPC number is 10612598314239. UNSPSC code is 32151705. HS code for customs is 85176200. Finally, store the module in a static-free environment before installation. Allen-Bradley and Rockwell Automation manufacture this product in the USA.