The EXCI option is provided on the PROTOCOL attribute of the CONNECTION resource definition to indicate that the connection is for use by an MVS™ program using the external CICS® interface.
The CONNTYPE attribute is provided on the CONNECTION resource definition. For EXCI connections, this indicates whether the connection is generic or specific. It is not to be used for any protocol other than the external CICS interface.
See the CICS Resource Definition Guide for details of the DEFINE CONNECTION panel for defining a connection using RDO. You can also use the DEFINE command with the DFHCSDUP batch utility program to define the connection. For information about ways of defining resources, see the CICS Resource Definition Guide. The following parameters are relevant to EXCI:
For an external CICS interface specific pipe, you must specify a NETNAME.
For external CICS interface generic pipes, you must leave NETNAME blank.
If you specify PROTOCOL(EXCI), you must also specify ACCESSMETHOD(IRC). EXCI is implemented in MRO using the CICS interregion communication program, DFHIRP, and cannot use MRO links that use MVS cross-memory services (XM). EXCI can use also XCF MRO links, which also work through DFHIRP.