# CICS System Initialization Parameters

You must set the following CICS SIP for Substation ES to connect to a CICS region.

    IRCSTRT=YES
    ISC=YES
    PLTPI=XI
    PLTSD=XD

For guaranteed messaging, set the value of the RRMS parameter as YES.

Note:

- If you use only reliable HVTs, the requirement for RRS is optional.

  For guaranteed or ordered trigger delivery, you must install the z/OS RRS server and have it running.

- If you set the RRMS parameter as YES, the CICS address space and the Substation ES address space must execute in the same LPAR.

  For the environment in which the RRMS parameter is set to NO, the CICS address space and the Substation ES address space do not have to be in the same LPAR.

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