Fast Path output messages (Finance)

When defined with the system definition TERMINAL macro option FPACK or an ETO logon descriptor, Fast Path output messages are sent requesting an exception DR2 response.

Fast Path output is sent requesting DR2 response when:
  • Queued output is available to be sent to any nondisplay component.
  • The system definition TERMINAL macro option BID or an ETO logon descriptor option BID is defined, and queued output is available to be sent to a display component.
  • The system definition TERMINAL macro option NOBID or an ETO logon descriptor option NOBID is defined, and queued output is available to be sent to a display component when the Fast Path output reply message is directed to a nondisplay component. The Fast Path output does not result in the display component being screen protected.

Unlike non-Fast Path output, the output message is left outstanding (not dequeued), and the workstation remains in response mode until the workstation sends data, a ready-to-receive (RTR) command, or the DR2 response to cause the message to be dequeued. The RTR command should be considered when no input is to be generated for an abnormally long time (for example, when the terminal operator plans to leave the terminal). The input message from the workstation, the RTR command, or the DR2 response acknowledges that the preceding output has been received and is recoverable; therefore, IMS might dequeue the output message, process any input message, or send any available output.

The system definition TERMINAL macro option NFPACK or an ETO logon descriptor indicates that the Fast Path output exception DR2 and next input acknowledgment protocol should not be used. In this case, Fast Path output messages are always sent requesting standard recoverable output message response protocols (DR2 response).

When the DR2 response is received, IMS dequeues the output message, removes the terminal from response mode, and sends any available queued output. Queued output is not sent to a display component if the Fast Path output reply message is sent to the same component because of the IMS screen protection support.