# Substation ES CICS Request/Reply Process

CICS Request/Reply process provides three messages:

1. At the beginning of the process SXS7501I.
   1. SXS7501I REQR Start Tsk:<task number> Occ:<index number> Wait:<wait time> Reply Opt:<indicator>"
      - SXS7501I is created just before the message is sent to Substation ES
2. At the end of the process SXS7502I.
   1. SXS7502I REQR End Tsk:<task number> Occ:<index number> RC:<return code>
      - This message is issued when the process ends
        - <return code> less than 4 means all is ok and response is being returned
        - <return code> equal to 170 is a time-out
3. When the response message arrives (even if it is after the time-out value).
   1. SXS7503I SXCREPLY Tsk:<task number> Occ:<index number>
      - This message is issued when SXCREPLY gets a response message
4. SXCREQR - calls to this program will generate a message to the statistics stream
   1. SXCREPLY

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