Using IMS test mode for ISC VTAM sessions
You can test ISC VTAM® communication protocols and editing facilities by putting a back-end IMS system into test mode.
While in test mode, IMS receives an input message, checks input protocols and FM header parameters, performs input and output editing, inserts appropriate output protocols and FM header parameters, and returns the message to the front-end subsystem. Noncommunication error analysis, transaction code verification, and transaction scheduling are bypassed. Also, IMS does not send asynchronous output while in test mode.
You can place one or all of the ISC sessions within a specific subsystem in test mode when the IMS /TEST command is received on the ISC sessions. The /TEST command can only be entered by the terminal that is being put into test mode. You can terminate test mode by sending an end-bracket (EB) indicator on an SNA LUSTATUS or CHASE command. Test mode can also be terminated when an /END command is received on the ISC session or is entered locally in the back-end IMS processor by an authorized terminal operator.
In an IMS-to-IMS environment, use the ISC message switch facility to place the back-end IMS system into test mode, to send the message and receive the echo reply, and to terminate test mode. This provides an efficient means of testing without requiring a user application in either subsystem.