R&S ZVL
Remote Control
Status Reporting System
Operating Manual 1303.6580.32-05
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4
IF overload
The internal local oscillator (LO) signal is phase locked to a 10 MHz signal. This message appears
when the internal phase locked loop (PLL) fails.
Reduce RF input level at the port. Check amplifiers in the external test setup.
5
LO unlocked
This bit is set if the analyzer detects that the instrument temperature is too high.
Shut down and restart the analyzer.
8
OCXO oven cold
This bit is set if the oven for the optional oven quartz (OCXO, option FSL-B4) is not at its operating
temperature.
Wait until the oven has been heated up.
9 ...
Not used
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".
Examples:
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).
