Requests on IMS input messages

The response and sync-point requests for input messages to IMS are summarized in the following table.

In the table, an X in the table indicates the entry is supported by IMS. An S in the table indicates the corresponding entry is suggested.

Table 1. Response and sync-point requests for IMS input messages
Input message type VTAM indicators with message
RQE1 1 RQD1 RQE2 1 RQD2
CD ¬CD CD ¬CD CD ¬CD CD ¬CD
Nonlast MFS page (autopage)   S   X        
Last MFS page (autopage)                
Recoverable and nonrecoverable         S   X S
Fast Path conversational recoverable and nonrecoverable transaction                
Response mode transaction S   X X S   X X
Nonrecoverable, nonresponse, nonconversational mode transaction S S2 X X S Note 2 X X
Recoverable, nonresponse, nonconversational mode transaction           S X S
MFS paging control request: SNA-formatted QMODEL FMHs S              
MFS paging control request: SNA RAP FMH         S   X  
IMS message switch                
IMS message switch using ATTACH SCHEDULER         S   X S
IMS message switch using ATTACH (no SCHEDULER)               Note 3
ATTACH SYSMSG4               Note 3
IMS command S   X X S   X X
VTAM command5                
LUSTATUS - commit         S   X S
Other X   X X        
Test mode6 S   X X S   S X
FMH7 (ERP) messages X Note 3 X Note 3        
Notes:
  1. A response is implied by a reply to the change-direction indicator; therefore, RQE1 or RQE2 is recommended when change-direction is sent. Either method of requesting a response is supported for the session BIND option of DEFINITE RESPONSE CHAINS. When IMS is running as a secondary system, the other half session (as the primary system), if sending a BB-CD chain, must indicate RQD1 to allow proper DFC bracket and send/receive synchronization.
  2. Supported only for irrecoverable-inquiry input requesting EB or BB/EB.
  3. Sent with EB. BB is also sent as needed.
  4. Because IMS SYSMSG is handled in the same manner as is a message switch, the same protocols apply.
  5. LUSTATUS might indicate RQE1 with EB or BB/EB. CHASE, LUSTATUS, and CANCEL commands can optionally request RQE1 with CD. LUSTATUS - commit can also request RQE2 or RQD2 for specific conditions. All other normal flow VTAM commands must request RQD1.
  6. Applies to test echo mode only. Not applicable to /TEST MFS.