Selecting And Terminating Ipds Mode Of Operation - IBM 6400 Programmer's Reference Manual

Selecting and Terminating IPDS Mode of Operation

An application can select the IPDS mode of operation by sending an FMH-1
containing a destination select of Begin (DESSEL equals BDS) along with a data
stream profile of IPDS (DSP equals IPDS). This FMH-1 must be sent as
only-in-chain (OIC) and cannot have any accompanying data. An FMH-1 that
selects IPDS mode has the following format:
After the IPDS mode selection, IPDS structured fields in single or multi-element
chains must not have the FMH-1.
An FMH BDS is valid only when the printer is not in IPDS mode. If the printer is
in IPDS mode and receives a BDS, the response to the FMH order is:
To terminate IPDS mode, an application sends an FMH-1 containing a destination
select of End (DESSEL equals EDS) along with a data stream profile of IPDS (DSP
equals IPDS). This FMH-1 must be sent as only-in-chain (OIC) and cannot have
any accompanying data. An FMH-1 that terminates IPDS mode has the following
format:
Terminating IPDS mode causes LU-1 to return to its default data stream of SCS.
An FMH EDS is valid only when the printer is in IPDS mode. If the printer is not
in IPDS mode and receives an EDS, the response to the FMH order is:
Figure 26 on page 172 shows the LU-1 data stream modes.
Order Complete
•
Sense Data X ' 1008 '
•
Invalid FM Header.
•
Order Complete
•
Sense Data X ' 1008 '
•
Invalid FM Header.
•
0601300D4000
0601300D2000
Appendix B. Summary of IPDS for Control Units
IPDS for Control Units
171