The supplied C header
file, cics3270.h, and the COBOL copybook cics3270.cbl, contain constants
and conversion tables that you will find useful in handling 3270 data
streams.
CICS to EPI (Outbound data streams)
The
3270 commands are either write commands, which instruct the EPI to
process the data, or read commands, which instruct the EPI to reply
with data.