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HP 27130A
NOTE
The security code is used to prevent the user from inad-
vertently writing to this register.
Validation: Must be two bytes and have correct security code. The port ID field in the request is ig-
nored, so any port may use this function.
Subfunction 34. Set Port ID. This request changes the mapping of logical port ID (the ID given in
the request and event blocks) and the physical port address (0-7) of the device.
The mapping
defaults at power-up to a one-to-one mapping; i.e., ID 0 is port 0, etc.
The logical port ID is supplied in the request block Port ID field, and becomes associated with the
physical port number in the data field. There is no restriction on the logical port ID, except that
it should not duplicate any other ID.
Validation: The data must be between 0 and 7 inclusive.
Control Card, Request Code
=
6
See the paragraph "Buffer Flushing" for additional details on this request code. A summary is shown
below.
SUBFUNCTION DESCRIPTION
o
2
3
4
5
6
7
No operation
Flush the current receive buffer
Flush all the queued receive buffers
Flush all the queued transmit buffers
Host initiated termination of frontplane record
Force restart of the transmitter if it was stopped due to waiting for
ACK or X -ON handshake. This control request is usually used after
turning off the handshake option to prevent deadlock.
Enter speed sense mode. When speed sense completes, an event will
be genera ted.
Terminate speed sense· mode. Speed sense mode (if enabled) is dis-
abled. The port is reset to the previous baud
rate~
parity, and charac-
ter size.
4-40
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