Terminals supported

To access back-end applications, FEPI has SNA secondary logical unit (SLU) support, so that CICS® FEPI applications can simulate certain logical unit (LU) types. FEPI uses the z/OS® Communications Server program-to-program support to provide this function, and to communicate between front-end and back-end applications.

Note: FEPI cannot send z/OS Communications Server logon data.

FEPI provides simulation support for two families of terminals. The names SLU2 and SLU P are used to identify the two types of support:

SLU2: for the 3270 family of terminals, used in many CICS and IMS applications. See the IBM 3270 Data Stream Programmers Reference.
SLU P: for a family of programmable terminals, including the 4700, accessed through an LU 0 protocol, for IMS applications. This protocol is defined in IMS/VS Programming Guide for Remote SNA Systems (for IMS/VS Version 2) or IMS Customization Guide (for IMS/ESA® Version 3 and later).

Data-stream-level and specialized-level commands can be used with both families of terminals, but the high-level commands, which use formatted data, are only for SLU2.

The mode of a conversation must be either SLU2 or SLU P; it cannot be mixed. For SLU2 conversations, formatted data or data stream data can be used, but cannot be mixed in the same conversation. The mode and data type are controlled by the pool used, which is set up by the system programmer.

These terminals are supported only when they are used to communicate with CICS or IMS systems.