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HP 16528/1653B
Programming Reference
4. To check whether bit 6 of an instruments status register is high, use
the following Basic statement:
I F B I T ( S t a t , 6 ) T H E N
5. If bit 6 of the instrument at address 1 is not high, then check the
instrument at address 7 to see if bit 6 of its status register is high.
6. As soon as the instrument with status bit 6 high is found check the
rest of the status bits to determine what is required.
The SPOLL(707) command causes much more to happen on the bus than
simply reading the register. This command clears the bus automatically,
addresses the talker and listener, sends SPE (serial poll enable) and SPD
(serial poll disable) bus commands, and reads the data. For more
information about serial poll, refer to your controller manual, and
programming language reference manuals.
After the serial poll is completed, the RQS bit in the HP 1652B/1653B
Status Byte Register will be reset if it was set. Once a bit in the Status
Byte Register is set, it will remain set until the status is cleared with a
Status Reporting
B-7
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