1 Power Meter Remote Operation
54 N1911A/1912A P-Series Power Meters Programming Guide
For example on measurement polling, refer to Figure B- 17 on page B-2.
The SRQ Method
When a bit of the Status Register is set and has been enabled to assert
SRQ (*SRE command), the power meter sets the GPIB SRQ line true. This
interrupt can be used to interrupt your program, suspending its current
operation, and find out what service the power meter requires. Refer to
your computer and language manuals for information on how to program
the computer to respond to the interrupt.
To allow any of the Status Register bits to set the SRQ line true, you must
enable the appropriate bit(s) with the *SRE command. For example, if
your application requires an interrupt whenever a message is available in
the output queue (Status Register bit 4, decimal weight 16). To enable bit
4 to assert SRQ, use the command *SRE 16.
Procedure
• Send a bus device clear message
• Clear the event registers with the *CLS (clear status) command
•Set the *ESE (standard event register) and *SRE (status byte register)
enable masks
• Enable your bus controller’s IEEE- 488 SRQ interrupt
Examples
The following two examples are written in HP BASIC and illustrate
possible uses for SRQ. In both cases, it is assumed that the power meter
has been zeroed and calibrated.
You can determine which bits are enabled in the Status Register using *SRE?. This
command returns the decimal weighted sum of all the bits.
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