Appendix B. Summary Of Ipds For Control Units; System Attachment; Data Stream Summary; Dsc Mode - IBM 6400 Programmer's Reference Manual

Appendix B. Summary of IPDS for Control Units

This appendix contains a summary of the SNA and DSC requirements for IPDS
communications between this printer and the 3174 and 3274 Control Units or the
4361 Work Station Adapter (WSA).

System Attachment

This printer can operate with both SNA and non-SNA control units. For SNA
control units, IPDS is only valid in LU-1 mode. For non-SNA control units, IPDS
is only valid in DSC mode.
For SNA (LU-1), the attachment protocols are:
For Non-SNA (DSC), the attachment protocols are:

Data Stream Summary

The following additions to LU-1 and DSC data streams are necessary for
operation with IPDS printers.
LU-1 Mode
FM Header Type 1, subset 4
Data Stream Query Reply structured field

DSC Mode

Data Chain structured field
Select IPDS Mode structured field
Data Chaining Query Reply structured field
Ó Copyright IBM Corp. 1995
Channel-attachment
•
SDLC-attachment.
•
Channel-attachment
•
BSC-attachment.
•
This header contains a data stream profile (DSP) code. A DSP code of
•
X ' 0D ' selects IPDS mode of operation.
This query reply indicates the valid data streams for the printer. A data
•
stream indicator code of X
is recommended that the programmer ask for a definite response when
issuing an End-of-Chain (EOC) or an End-of-Bracket (EOB) command.
This structured field (0F21) defines the data chaining function.
•
This structured field (0F83) defines the selection of IPDS mode.
•
This query reply structured field (with a Q code of 98) indicates data chaining
•
is valid in DSC mode.
' 02 ' indicates that IPDS is valid in LU-1 mode. It
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