Defining terminals with data communication macros

By using different combinations of the 16 macro statements used for the IMS data communications facilities, you can define terminals to be attached to the IMS online system.

Restriction: This topic does not apply to DBCTL.

Most of the system definition stage 1 input is comprised of declarations that define terminals to be attached to the IMS online system. Sixteen macro statements describe all of your IMS system's data communication facilities. By using different combinations of these statements, you can create macro sets that support:

If you are using IMS Extended Terminal Option (IMS ETO) of IMS TM to define terminals, you can reduce the number of macro statements that are required for system-defined VTAM terminals. For more information about IMS ETO, refer to Including IMS ETO in the IMS system.

Table 1 provides an overview of each macro set and a detailed description of the macro statements in each macro set. Use this information and the accompanying configuration diagrams to define your terminals. Each of the terminal types and hardware options has equivalent parameters in one or more of the terminal-related macros in the stage 1 system definition input.

In some instances, you must prepare the same macro statements for more than one of the macro sets. Refer to the topic Coding IMS macros that define the system for information about the order of entering the macro sets into the assembler input stream. IMS issues stage 1 system definition output warning messages and does not complete system definition if the macro sets are not entered in this order.