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Serial Poll
Using Serial Poll
Status Reporting
B-6
The HP 1652B/1653B supports the IEEE 488.1 serial poII feature. When
a serial poll of the instrument is requested, the RQS bit is returned on bit
6 of the status byte.
This example will show how to use the service request by conducting a
serial poll of ah instruments on the HP-IB bus. In this example, assume
that there are two instruments on the bus; a Logic Analyzer at address 7
and a printer at address 1.
The program command for serial poIl using HP BASIC 4.0 is Stat =
this example. The command for checking the printer is Stat =
7. This command reads the contents of the HP-IB Status Register into the
variable called Stat. At that time bit 6 of the variable Stat can be tested to
see if it is set (bit 6 = 1).
The serial polI operation can be conducted in the following manner:
1. Enable interrupts on the bus. This allows the controller to "see" the
SRQ line.
2. Disable interrupts on the bus.
3. If the SRQ line is high (some instrument is requesting service) then
check the instrument at address 1 to see if bit 6 of its status register
is high.
HP 16528/1653B
Programming Reference
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