The module allows ASCII characters to be sent and received over serial communication channels. It supports ASCII protocol communication, which enables the PLC to exchange data with other devices, such as printers, barcode scanners, and text display terminals, using ASCII characters.

The 1769-ASCII module provides two serial communication ports, and each port can be configured independently for specific communication parameters such as baud rate, parity, stop bits, and data bits. It also supports half-duplex communication, meaning that the module can either send or receive ASCII data at a time.

The module is typically used in industrial applications where ASCII-based devices need to be integrated with the PLC system. For example, it can be used to interface with barcode readers for product tracking or with text display terminals for operator interface.

To use the 1769-ASCII module, you would need to configure the communication parameters, set up the appropriate messaging instructions in the PLC program, and establish the necessary wiring connections to the external devices.