CICS to EPI (Outbound data streams)

The 3270 commands are either write or read commands, instructing the EPI to process the data or to reply with data respectively.

On a CICS_EPI_EVENT_SEND event, the command is one of the following 3270 write commands:

The first three commands are followed by a write control character (WCC) and data. An Erase All Unprotected command has neither WCC nor data. The Write Structured Field command is not generated by CICS® and is therefore not supported for the EPI.

Command
(1 byte)

Write control
character
(1 byte)

Data buffer
(variable length)

The contents of the data buffer consist of:
A CICS_EPI_EVENT_CONVERSE event specifies a read command. The contents of the data stream vary with the source of the event, as follows: