R&S ZVB - Application of the Status Reporting System

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT Remote Control
Status Reporting System
Operating Manual 1145.1084.12 – 30 603
Bit
No.
Meaning
11
Problem concerning external power meter
This bit is set if an external power meter has been configured but cannot be controlled or provides error messages.
Check whether the power meter is properly connected and switched on. Check the GPIB address; exclude address
conflicts when using several external power meters or other equipment.
12
Time grid too close
This bit is set if the sweep points for a time sweep are too close, so that the analyzer cannot process the measurement
data until the next sweep point starts.
Increase stop time, reduce no. of points, increase IF bandwidth. If possible reduce number of partial measurements, e.g.
by restricting the number of ports measured.
13
Overload at DC MEAS
This bit is set if the input voltage at one of the DC input connectors on the rear panel is too high.
Reduce input voltage.
14
Power settings exceed hardware limits
This bit is set if the source power at one of the test ports is too high or too low.
Reduce or increase the source power.
15
Detector meas time has been internally limited
This bit is set if the selected measurement time for a detector (observation time) is too long.
If desired, reduce the measurement time or select a smaller IF bandwidth.
Application of the Status Reporting System
The purpose of the status reporting system is to monitor the status of one or several devices in a
measuring system. To do this and react appropriately, the controller must receive and evaluate the
information of all devices. The following standard methods are used:
 Service request (SRQ) initiated by the measuring device
 Serial poll of all devices in the bus system, initiated by the controller in order to find out who sent a
SRQ and why
 Parallel poll of all devices
 Query of a specific instrument status by means of commands
 Query of the error queue
Service Request
The measuring device can send a service request (SRQ) to the controller. Usually this service request
causes an interrupt, to which the control program can react appropriately.
Initiating an SRQ
As shown in the graphical overview, an SRQ is initiated if one or several of bits 2, 3, 4, 5 or 7 of the status
byte are set and enabled in the SRE. Each of these bits summarizes the information of a further register,
the error queue or the output buffer.
The ENABle parts of the status registers can be set such that arbitrary bits in an arbitrary status register
initiate an SRQ. To use the possibilities of the service request effectively, all bits in the enable registers
SRE and ESE should be set to "1".