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HP 27130A
S
bit
Used by all non -blocked read device data requests and by the last block of the blocked read
device data request. If the S bit is set, any remaining data in the current read record will be avail-
able for the next read request. If the S bit is clear, any data remaining in the current record will be
discarded after the read is completed.
BLK
0= non-blocked data transfer
1
=
blocked data transfer
F
Flush data before processing this request. Any data residing in the indicated port's receive buffer is
flushed before a read is begun (ROD requests only).
request code
0= Reserved
1
=
Read Device Data (RDD)
2
=
Write Device Data (WDD)
3
=
Not used
4
=
Read Card Information (RCI)
5
=
Write Card Configuration data (WCC)
6
=
Control Card (CC)
7
=
Not used
8 - 1 5
=
Reserved
subjunction code
The content of this field is dependent on the type of the request.
port ID
The port ID is the logical port to which the request is directed. The mapping of logical port to
physical port (0 - 7) is defaulted as a one-to-one mapping (PID 0
=
port 0, etc.) but can be recon-
figured using WCC, SF 34 (Write Card Configuration, Subfunction 34).
A logical port is used to provide compatibility with other CHANNEL I/O cards which may not
ha ve a simple device addressing mode.
4-3
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