Using the MOD name and LTERM interface

For example, the application program can use the MOD name to communicate with IMS™ to specify how an error message could be formatted. For non-LU 6.2 application programs, the MOD name is given to the MFS formatting modules in IMS; for LU 6.2 application programs, the MFS modules are not called, and the MOD name is given to the LU 6.2 Edit exit routine (DFSLUEE0) as a parameter. The LU 6.2 Edit exit routine can do whatever the programmer specifies with the MOD name, such as format an error message.

Your LU 6.2 application program uses the LU name to send data to an LU 6.2 application program. However, if you want to send data to a non-LU 6.2 device such as a printer, you can use the LTERM instead of the LU name.

The Initialization exit routine (DFSINTX0) can be used to create a user table of MOD names that you might want to use for formatting messages, and LTERMs that you might want to use as printers. This user table can be used by DFSLUEE0 to find the appropriate MOD name or LTERM for your application program.

LU 6.2 application programs can send both the LTERM and the MOD name in the first segment of the message. The LU 6.2 Edit exit routine (DFSLUEE0) checks the contents of the first message segment. Based on the information it finds in a user table, the exit routine decides whether to return the LTERM and the MOD name to IMS. IMS saves the LTERM and the MOD name in the I/O PCB. For formatting output, IMS provides the address of the MOD name in the first segment of the message to the LU 6.2 Edit exit routine (DFSLUEE0). For changing the destination to a non-LU 6.2 device, IMS provides the LTERM in the first segment of the message to the LU 6.2 Edit exit routine (DFSLUEE0). The Initialization exit routine (DFSINTX0) can be used to create the user table. This exit routine must pass the address of the user table to IMS, and IMS passes the address to DFSLUEE0.