VTAM commands and indicators

When a VTAM® command is sent to IMS, a DR1 must be requested.

When IMS sends a VTAM command, it requests a DR1. If the BIND or BID command is sent, the response must be either a DR1 or exception DR1. If the STSN command is sent, a DR1 is required.

The controller responds to all other VTAM commands and indicators for the workstation.