User`s guide

cxlviii Contents
The DDM Query Reply
Several DDM query reply formats will be supported. Some of these formats are listed below:
Table D-l. DDM Query Reply Base Format
Offset Length Content Meaning
0 1 word Length Length of Structure
2 1 byte 0x81 Query Reply ID
3 1 byte 0x95 Query Reply Type
4-5 2 bytes FLAGS Reserved
6-7 2 bytes LIMIN Maximum DDM bytes allowed in inbound
transmission
8-9 2 bytes LIMOUT Maximum DDM bytes allowed in
outbound transmission
10 1 byte NSS Number of subsets identifier
11 1 byte DDMSS DDM subset identifier
DDM Application Name Self-Defining Parameter
The DDM Application Name self-defining parameter provides the host application with the name of
the application containing control of the DDM Auxiliary Device. The controlling application is
identified by the DOID in the Direct Access self-defining parameter.
This SDP is optional, but it is necessary if a host application is to identify distinct DDM auxiliary
devices when more than one application is in existence at a remote workstation.
Table D-2. DDM Application Name SDP
Offset Length Content Meaning
0 1 byte Length Parameter Length
1 1 byte 0x02 DDM Application Name
2-n n-2 bytes NAME Name of Remote Application Program
NAME: The name consists of 8 characters or less and is the means by which a host application may
relate to an application in a remote workstation. It is the responsibility of the host and remote
application users to ensure that the name is understood by the applications at each end.
PCLK Protocol Controls Self-Defining Parameter
The PCLK (PC link) Protocol Controls self-defining parameter indicates that the PCLK Protocol
Controls structured field, ID = X'1013', can be used both inbound and outbound in data streams
destined to or from the DDM auxiliary device processor.
Table D-3. DDM PCLK Auxiliary Device SDP
Offset Length Content Meaning
0 1 byte 0x04 Parameter Length
1 1 byte 0x03 PCLK Protocol Controls
2-n n-2 bytes VERS Protocol Version