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HP 27130B
F
Flush data before processing this request. Any data residing in the indicated port's receive buffer are
flushed before a read is begun (RDD requests only).
frequest code
o
=
Reserved
1
=
Read Device Data (RDD)
2
=
Write Device Data (\VDD)
3
=
Not used
4
=
Read Card Information (RCI)
5
=
\Vrite Card Configuration data (\VCC)
6
=
Control Card (CC)
7
=
Not used
8 - 1 5
=
Reserved
sUbfunction 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 ('-"'rite Card Configuration, Subfunction 34).
A logical port is used to provide compatibility with other CHANNEL I/O cards which may not have
a simple device addressing mode.
data length
Required for all read or write requests. All other requests should contain zeros.
CAPABILITIES
The following paragraphs provide detailed descriptions of the MUX capabilities.
4-3
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