- System manager or operator
- Closes the SNA Communications Server (formerly VTAM) terminal interface (z/OS and z/VM only)
The VTAMOFF command closes the Virtual Telecommunications Access Method (SNA Communications Server) interface during a Model 204 run. The SNA Communications Server interface is described in Preparing for Transfer Control communication.
When VTAMOFF is specified, Model 204 sends an error message to alert the operator that the SNA Communications Server interface is being closed. All users supported by the interface are restarted softly and disconnected.
In z/OS or z/VSE the operator can restart the interface by replying
RETRY to the outstanding message "SNA Communications Server 3270 interface is closed. Reply retry or halt." Replying
HALT disables the interface until the end of the run.
In z/VM, the operator can restart the interface by issuing the VTAMON command.