Serial Poll - HP 1650B Programming Reference Manual

Serial Poll

Using Serial Poll
(HP-IB)
Status Reporting
B-6
The HP 1650B/1651B supports the IEEE 488.1 serial poll 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 all 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 poll 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 poll 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.
check the instrument at address 1 to see if bit 6 of its status register
is high.
HP 1650B/HP 16518
Programming Reference