Scheduler in TSO/ISPF gets "DATACOM NOT ACTIVE"

Products

• Scheduler Job Management

Issue/Introduction

When the Scheduler ISPF interface is invoked, message "DATACOM NOT ACTIVE" appears.

At this time, both the Datacom MUF, and Scheduler started task are active.

 

Cause

The Scheduler, and Datacom load libraries are defined in the TSO logon proc STEPLIB DD, but they are not in the correct order.  
STEPLIB DD has the Scheduler loadlib, follows by the Datacom loadlib and CUSLIB.
Example:
//STEPLIB DD DISP=SHR,DSN=CAI.SCHED.CAILOAD
//                DD DISP=SHR,DSN=CAI.DATACOM.CAAXLOAD
//                DD DISP=SHR,DSN=CAI.DATACOM.CUSLIB
 

Resolution

The Datacom CUSLIB is a user-customized libraries and must be searched before the Datacom executable library.  
The correct order is as follows: 

//STEPLIB DD DISP=SHR,DSN=CAI.SCHED.CAILOAD
//                DD DISP=SHR,DSN=CAI.DATACOM.CUSLIB
//                DD DISP=SHR,DSN=CAI.DATACOM.CAAXLOAD

 

Additional Information

Why a module is loaded from LINKLIST when it is in STEPLIB