# Rendezvous Request-Reply Timer Utility

Request-Reply Timer Utility records the time a request is delivered and the elapsed time until a reply is received for the same message.

This utility performs the following tasks:

- Measures the elapsed time from when a request is received until a reply is delivered.
- Summarizes the multiple request or reply timings for the transmission interval.
- Optionally prints the timing information for each Request or Reply event captured.

To capture the timing of the request or reply sequence, a field named in the conversational message is identified. The value of this field must be constant during the conversation. For the timer utility to capture multiple request or reply conversations, the value of the field identified in the message must be unique for each request. A message sequence number can normally be used for this purpose.

The Timer Utility was originally used for CICS outbound request or reply conversations and can be used for bidirectional conversations. For CICS-outbound requests, the Substation ES envelope field identifies conversations. The Timer Utility understands the content of the envelope and can reveal detailed information on the request when the Timer Utility is in use for that purpose.

Note: Rendezvous INBOX communication is not supported.

The sample JCL stream is listed as follows:

- Data Set: `USERHLQ.JCL`
- Member: `SXRTMER`

Before using this utility, you must specify the correct Rendezvous transport parameters.

Also, review and select the appropriate Request-Reply Timer Control Parameters. See Request-Reply Timer Control Parameters.

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