Bypassing MFS editing

IMS enables an IMS application program to bypass MFS formatting of an output message destined to an IBM® 3270 or to SLU–2 devices by specifying reserved format names DFS.EDT or DFS.EDTN. This bypass is intended for subsystems or installation support programs that execute under IMS.

Recommendation: Do not use this bypass for IMS application programs, because the application program loses the productivity, device independence, and migration benefits associated with MFS.

When MFS is bypassed on output, the application program must construct the entire 3270 data stream, beginning with the command code and ending with the last data byte. The user might want to bypass the MFS output edit function to allow application programs to receive the 3270 input data stream from the terminal without MFS or basic editing.