Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 109
Chapter 6
ASCII serial port instructions
ASCII serial port instructions are communication instructions that use or alter the
communication channel for receiving or transmitting data.
Function block Description
ABL on page 110 Determine number of characters in buffer (up to and including end of line character)
ACB on page 111 Determine total number of characters in buffer
ACL on page 114 Clear the receive and transmit buffers
AHL on page 116 Set or reset modem handshake lines
ARD on page 118 Read characters from the input buffer and place them into a string
ARL on page 121 Read one line of characters from the input buffer and place them into a string
AWA on page 123 Write a string with user-configured characters appended to an external device
AWT on page 125 Write characters from a source string to an external device
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