Transaction-request message segment (client to Listener)

To initiate a connection with an IMS™ server, the client first issues a transaction-request message segment (TRM), which tells the Listener which transaction to schedule.

The format of the transaction-request message segment (TRM) is:

Field	Format	Meaning
TRMLen	H	Length of the segment (in binary) including this field. This field is sent in network byte order.
TRMRsv	CL2	Reserved
TRMId	CL8	Identifying string. Always TRNREQ. If the client data stream will be sent in ASCII, the TRMId field should also be transmitted in ASCII because the Listener uses this field to determine whether ASCII to EBCDIC translation is required.
TRMTrnCod	CL8	The transaction code (TRANCODE) of the IMS transaction to be started. It must not begin with a / character; it must follow the naming rules for IMS transactions. If the Listener has determined that data will be transmitted in ASCII, it translates the transaction code to EBCDIC before any further processing is done.
TRMUsrDat	XLn	This variable-length field contains client data that is passed directly to the security exit without translation.