SLU-1 devices

SLU-1 devices can include communication terminals and printers.

These topics describe the following SLU-1 devices as examples:

IBM® SLU-1 Communication Terminal.
IBM SLU-1 Data Communication System (Programmable Models). The SLU-1 supports input from a transmit data set (TDS) or a user data set (UDS), in addition to print data set (PDS) and UDS output if you define them to IMS as unattended.
IBM SLU-1 Data Communication System (Nonprogrammable Models).

MFS is optionally available for TDS input and PDS output. You can define a SLU-1 device for either attended or unattended operation.

Printers attached to IMS as SCS SLU-1 devices

Most of the printers have Cancel, PA1, and PA2 keys that can be used when the device is operating in SNA character string (SCS) mode and is attached to an appropriate controller, such as the 3174, 3274, 3601, or 4701. When these keys are pressed while IMS is printing a message, the following results occur:

If the Cancel key is pressed, IMS stops transmission and discards the current output message (but does not dequeue it).
If a PA key is pressed, a string of characters is sent to IMS. You can define this string of characters as transaction code APAK 01 for PA1 and APAK 02 for PA2, or you can use the appropriate IMS user exit routine to modify this string, for example to set it to a command or message switch.

Restriction: You must specify CONSOLE instead of PRINTER1 for the COMPT1 keyword of the TERMINAL macro (or the logon descriptor for the printer). In the TYPE macro or logon descriptor, specify the printer as UNITYPE=SLUTYPE1.

SLU-1 communication terminal

These topics describe IMS operations for a SLU-1 Communication Terminal or a SLU-1 Data Communication System (nonprogrammable models).