User`s guide

Remote Interface Reference 3
SCPI Status Registers
E3632A User’s Guide 113
The Status Byte Enable register (request service) is cleared
when:
• you execute the *SRE 0 command.
• you turn on the power and have previously configured the
power supply using the *PSC 1 command.
The enable register will not be cleared at power- on if you
have previously configured the power supply using *PSC 0.
Using Service Request (SRQ) and Serial POLL
You must configure your bus controller to respond to the
IEEE- 488 service request (SRQ) interrupt to use this
capability. Use the Status Byte Enable register (*SRE
command) to select which summary bits will set the
low- level IEEE- 488 service request signal. When bit 6
(request service) is set in the Status Byte, an IEEE- 488
service request interrupt message is automatically sent to
the bus controller. The bus controller may then poll the
instruments on the bus to identify which one requested
service (the instrument with bit 6 set in its Status Byte).
To read the Status Byte summary register, send the
IEEE- 488 serial poll message. Querying the summary register
will return a decimal value which corresponds to the
binary- weighted sum of the bits set in the register. Serial
poll will automatically clear the request service bit in the
Status Byte summary register. No other bits are affected.
Performing a serial poll will not affect instrument
throughput.
NOTE
The request service bit is cleared only by reading the Status Byte using an
IEEE-488 serial poll or by reading the event register whose summary bit is
causing the service request.