Remote Control
R&S
®
ZNA
746
User Manual 1178.6462.02 ─ 12
Bit No.
Meaning
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.
7.5.4
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
described in the following sections are used:
●
Service request (SRQ) initiated by the measuring device
●
Serial poll of all devices in the bus system, initiated by the controller 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
7.5.4.1
Service Request
The R&S
ZNA 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 section
, 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 buf-
fer.
The ENABle parts of the status registers can be set such that arbitrary bits in an arbi-
trary 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".
Example: Use *OPC to generate an SRQ
1. Set bit 0 in the ESE (Operation Complete).
2. Set bit 5 in the SRE (ESB).
3. Insert
*OPC
in the command sequence (e.g. at the end of a sweep)
Status Reporting System
