MFS control functions (SLU P)
The following device-level MFS control functions are available to logical units defined as SLU P.
SLU P terminals process the DPM-formatted output messages that specify paging option on the MFS device format. The paging option can be OPTIONS=DPAGE or OPTIONS=PPAGE.
- Page Advance (NEXTPP)
- If a current message with OPTIONS=PPAGE is defined, transmit the data fields defined in the next presentation page. If a current message with OPTIONS=DPAGE is defined, transmit the data fields defined in the next logical page.
- Logical Page Advance (NEXTLP)
- Transmit the data fields defined in the next logical page of the current message if one exists and if either OPTIONS=PPAGE or OPTIONS=DPAGE is specified.
- Logical Page Request
- PAGEREQ=nn, where nn is the number of the logical page desired. If the request is valid, transmit the data fields defined in the specified logical page of the current message.
- Message Advance Protect and Message Advance (NEXTMSGP and NEXTMSG)
- Discontinue transmitting the current output message and begin transmitting the next message in the output queue.
The control functions of NEXTPP, NEXTLP, NEXTMSGP, and NEXTMSG can be specified in input function management headers or by defining an operator control field within the input data to MFS. Logical page requests can only be entered within the input data or using the operator control field.