Rockwell Automation 1769-ASCII Compact I/O ASCII Module - Manual (Page 52)

52 Rockwell Automation Publication 1769-UM012B-EN-P - January 2014
Chapter 2 Configure the 1769-ASCII Module
Input Channel1
The Input Channel1 does the following tasks:
• Stores the current value, on first scan, of Rx Transaction ID (channel 1) as
most recent.
• Monitors the lower 8 bits of Rx Transaction ID (upper 8 bit are Tx)
• Indicates new data when the Rx Transaction ID changes.
• Copies the data from the module's Input Tags to a STRING tag
(InData1).
• Indicates to the MainRoutine that new data has arrived.
• Saves the value of Rx Transaction ID, so you can detect next change.