The CMU offers 30 independent STATus:OPERation:CMU:SUM1|2:CMU<nr> sub-registers (<nr>=1 ... 15) which are implemented in hierarchical form. The bits of the 30 STATus:OPERation registers are set only after the registers are assigned to a function group and measurement mode (see Overview of the Status Registers).
In the EVENt part, the STATus:OPERation register contains information
on which actions the instrument has executed since the last readout. All
five parts of the registers can be read using one of the commands of the
subsystem STATus:OPERation:CMU:SUM1|2:CMU<nr>:... .
Moreover, the EVENt part can be enabled and read by means of the STATus:OPERation:SYMBolic...
commands, see section Symbolic
Status Event Register Evaluation.
The bit assignment for the CMU base system which is always assigned
to the ...SUM1:CMU1 sub-register (secondary address 0) is
as follows:
Meaning of the bits used
in the STATus:OPERation:CMU:SUM1:CMU1
sub-register assigned to the CMU base system
| Bit-No. | Meaning | Symbol in |
| 4 | Measurement Result is Invalid
This bit is set if a measurement caused invalid results, e.g. because of no input signal was available (see also section Retrieving Measurement Results). |
MINV |
|
5 |
System Error |
SERR |
|
6 |
Reference Frequency Not Locked This bit is set if synchronization to the reference
frequency failed (e.g. because of a missing or faulty external reference
frequency). The CMU checks the synchronization approx. once per second
and updates the RFNL bit. Alternatively, the synchronization can be queried
via |
RFNL |
For function group RF Non Signalling, the bit assignment is as follows:
Meaning of the bits used in the STATus:OPERation:CMU:SUM1|2:CMU<nr> sub-register assigned to RF Non Signalling
| Bit-No. | Meaning | Symbol in STATus:OPERation:SYMBolic... |
| 0 | Overload
This bit is set if the currently used input connector is overloaded. |
IOV |
| 4 | Measurement Result is Invalid
This bit is set if a measurement caused invalid results, e.g. because no input signal was available (see also section Retrieving Measurement Results). |
MINV |
| 11 | RF Input Overdriven
This bit is set if the RF input level at connector RF1, RF2 or RF 4 IN is larger than the specified RF Max. Level plus an appropriate margin. |
RFIO |
| 12 | RF Input Underdriven
This bit is set while the RF input level at connector RF1, RF2 or RF 4 IN falls below the measurement range controlled by the specified RF Max. Level. |
RFIU |
For optional function groups refer to the relevant manuals.
Application example (see also description of Winbatch tool): The following command sequence shows how an event "Measurement Result is Invalid" is registered in the status reporting system and illustrates some of the tools that the CMU provides to monitor the instrument status.
| ... | |
|
Clear status reporting system. |
|
Include service requests sent by the CMU in the remote control report. |
|
Display remote report on screen. |
|
Enable service request. |
|
Enable event reporting for bit no. 4, MINV, in a different function group (GSMxxx-MS Non Signalling). |
|
Initiate a single-shot narrow-band power measurement using default settings and return results. In case of invalid measurement results (e.g. because no GSM input signal is applied to the input connectors of the CMU), a read symbol "S" for service request should appear on the screen. |
|
Check which function group reported an event. The query returns the GSM function group. |
|
Query events reported by the GSM function group: Bit MINV must be set |