Using Intersystem Communication Edit

Intersystem Communication (ISC) Edit is the default edit for messages from LU 6.1 devices. It is not valid for any other device types. One advantage of using ISC edit is that IMS TM does not edit the text of a message, allowing you to enter binary data.

Editing input messages

The editing IMS TM does to input messages depends on whether the Function Management (FM) header contains the SNA-defined primary resource name (PRN) parameter. In either case, IMS TM removes the FM header before the input message is received by the application program.

If the FM header does not contain the PRN parameter:

  • IMS TM removes leading control characters and blanks when it receives the first segment of an input message for your application program.
  • If the message segment contains a password, IMS TM removes the password and inserts a blank where the password was.
  • IMS TM does not edit the text of the message (the data following the password).

If the FM header contains the PRN parameter:

  • The PRN is treated as the transaction code and is received by your application program as the first field in the message segment.
  • The message segment is not edited by IMS TM.

Editing output messages

ISC edit does not edit output messages.