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HP 27130B
Subfunctions 0 through 33 - Read Port Configuration. Subfunctions 0 through 33 read back the
information defined in subfunctions 0 through 33 of the write card configuration, respectively.
Sub function 249 - Read Data Status. Returns a byte which indicates the presence of any receive data
(terminated or not) on the MUX for the indicated port. Received data exists on either the backplane
or frontplane if the returned byte is non-zero.
The data block returns the following:
byte 0
data on frontplane or
backplane
Subfunction 250. Get Card RAM. The uppermost 16K bytes of card RAM memory is sent to the
host in the data block. (The other 32K bytes of RAM are not used by the MUX firmware.) The host
buffer must be large enough to hold the data.
4-21
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