R&S ZVL
Remote Control
Status Reporting System
Operating Manual 1303.6580.32-05
342
As soon as all commands preceding
*OPC
have been completed, the instrument generates an
SRQ.
Generate an SRQ when a limit is exceeded
1. Set bit 3 in the SRE (summary bit of the STATus:QUEStionable register, set after
STATus:PRESet)
2. Set bit 10 in the STATus:QUEStionable:ENABle register (summary bit of the
STATus:QUEStionable:LIMit1 register)
3. Set bit 1 in the STATus:QUEStionable:LIMit1:ENABle register
The analyzer generates a SRQ when the event associated with bit 1 of the
STATus:QUEStionable:LIMit1:ENABle register occurs, i.e. when any point on the first trace fails
the limit check.
Find out which event caused an SRQ
The procedure to find out which event caused an SRQ is analogous to the procedure to generate
an SRQ:
1.
STB?
(query the contents of the status byte in decimal form)
If bit 3 (QUEStionable summary bit) is set, then:
2.
STAT:QUES:EVENT?
(query STATus:QUEStionable register)
If bit 10 (QUEStionable:LIMit1 summary bit) is set, then:
3. Query
STAT:QUES:LIMit1:EVENT?
(query STATus:QUEStionable:LIMit1 register)
If bit 1 is set, then the first trace failed the limit check.
The SRQ is the only possibility for the instrument to become active on its own. Each
controller program should set the instrument such that a service request is initiated in the
case of malfunction. The program should react appropriately to the service request.
Serial Poll
In a serial poll, the controller queries the STatus Bytes of the devices in the bus system one after another.
The query is made via interface messages, so it is faster than a poll by means of
*STB?
.
Serial poll procedure
The serial poll method is defined in IEEE 488.1 and used to be the only standard possibility for different
instruments to poll the status byte. The method also works for instruments which do not adhere to SCPI or
IEEE 488.2.
The Visual BASIC command for executing a serial poll is "IBRSP()".
The serial poll is mainly used to obtain a fast overview of the state of several instruments connected to the
controller.
