Prerequisites

RED Initialization Parameters for CICS

You must set the following CICS System Initialization Parameters for Substation ES to connect to a CICS Region: 
PLTPI=RI
PLTSD=RD

Review USERHLQ.ASM(SXXACFGC), which contains the parameters that can be used to configure the RED interface. You might not have to make changes to it. Note that if you change the default name of your Mainframe HUB, you must change this source file to use the same name. They can be found in the USERHLQ.ASM data set.
Note: RED transactions (#RED) use CICS OTE. Review your MAXOPENTCB parameter to ensure it is greater than the transaction interface for RED parameter CICS-MAIN-MAX which defaults to 21.