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Reading the Status Byte Register
The Status Byte register can be read with either of the following commands:
*STB?
SPOLL
Both commands return the decimal weighted sum of all set bits in the
register. The difference between the commands is that *STB? does not clear
bit 6 (RQS service request). The serial poll (SPOLL) does clear bit 6. All
bits in the Status Byte register with the exception of MAV are cleared with
the command:
*CLS
MAV is cleared when data is read from the output queue.
The Service Request
Enable Register
The Service Request Enable register specifies which (status group)
summary bit(s) will send a service request message to the computer over
HP-IB. The bits are specified (unmasked) with the command:
*SRE <
unmask
>
All unmasked bits in the Enable register can be determined with the
command:
*SRE?
The Service Request Enable register is cleared at power-on, or by
specifying an <unmask > value of 0.
Presetting the Enable
Register and Transition
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The Enable registers and Transition Filters in the Questionable Signal and
Operation Status Groups can be preset (initialized) with the command:
STATus:PRESet
All bits in the Enable registers are masked (i.e. <unmask > is 0), and all bits
in the Condition registers set corresponding bits in the Event registers on
positive (0-to-1) transitions.
Chapter 3 Understanding the HP E1429 Digitizer 173