See the full application note here:
PN:90000642_A Rockwell ControlLogix polling ASCII devices as PCCC Slaves
This application note explains how to use a MSG block within a ControlLogix PLC program to remotely read or write ASCII data via the Digi One IAP and the new Release E firmware. The Digi One IAP makes the ASCII device (such as a bar code scanner, weight scale, or LED marquee sign) appear as a PCCC/DF1 device. So the ControlLogix can just use SLC5 style typed read and writes to access it.