System sense field

X'0802'

RECOVERABLE ERROR—If the message is recoverable, IMS returns it to the output queue and retransmits it following the next input from that workstation or whenever additional output for that destination is queued. Retransmission of chained messages begins from the first-in-chain transmission. Because any open bracket is closed upon receipt of the exception DR2, the retransmitted message contains end-bracket only or both begin-bracket and end-bracket indicators (depending upon whether input occurred or whether the bracket indicators were specified). Irrecoverable messages have been dequeued and cannot be recovered and retransmitted.

X'0811'

BREAK—Cancel output. The output message is terminated. This message is dequeued from IMS and is not retransmitted; it is not subject to recovery. Any remaining output messages that are queued for the workstation are sent. If additional output is not available after receiving this sense code, IMS sends a null output message.

X'0812'

TEMPORARY ERROR—Resource not available. IMS action same as for X'0802'.

X'0813'

TEMPORARY ERROR, BID OR BRACKET REJECTED—NOT READY TO RECEIVE follows. IMS action is the same as for X'0802'.

X'0814'

TEMPORARY ERROR, BID OR BRACKET REJECTED—READY TO RECEIVE follows. IMS action is the same as for X'0802'.

X'081C'

STATION/COMPONENT DOWN—If byte 3 indicates a valid component (X'01' through X'04'), IMS marks the indicated component as inoperable. If byte 3 indicates X'00' or an invalid component (other than X'01' through X'04'), IMS interprets this as a session termination request and terminates the session. If the message in progress is recoverable, IMS returns it to the output queue and retransmits it when the workstation or component is again operable. Irrecoverable messages cannot be recovered and retransmitted.

Any other value for bytes 0 and 1 are handled as a request to terminate the session.

If the BID option is defined, the controller application program should use either X'0813' or X'0814' in an exception DR1 to the BID command; otherwise, the session is terminated because of an invalid response.

The X'0813' sense code results in the message being returned to the IMS output queue if it is recoverable, or dequeued if it is irrecoverable. Any recoverable data returned to the queue causes the bid to be sent again following the next input from the workstation, or whenever additional output for that destination is queued.

The X'0814' sense code causes a recoverable message to be returned to the IMS output queue, or a irrecoverable message to be dequeued. IMS then waits for an RTR command. The workstation can now send input to IMS. Until an RTR is received, IMS does not initiate any output when in a between-brackets state. If IMS is left in an in-bracket send state (the last input carried BB/CD), IMS sends output with EB to terminate the current bracket.