User's Guide _______________________________________________________________________ 
154  __________________________________________________________________ M211107EN-C 
Internal Monitoring 
Extensive built-in tests are included in the FS11P operation. Various 
voltages are measured, and corresponding alarm and warning limits are 
checked. 
The FS11P sensor generates a warning if some monitored value does not 
meet the criteria for optimal operation, but the measurement results are 
still reliable. For example, slightly contaminated windows or aging 
transmitter LEDs generate warnings. If a critical hardware failure is 
detected, the sensor indicates an alarm and the corresponding data is set 
as missing (/////). 
Built-in tests include contamination monitoring, signal monitoring, 
hardware monitoring, and memory tests. The results of the monitoring 
are displayed in the status message. 
FS11P Status Messages 
The status messages display the results of the built-in test system. A short 
status check message shows a quick report of the system status. The short 
status message is requested with the command STATUS CHECK: 
0> status check 
FS11P SYSTEM STATUS: OK 
 
Measurement unit: OK 
Current Events: 
NONE. 
Interface unit: OK 
Current Events: 
Conf2:VIS+ALS measurement 
Background luminance sensor: OK 
Current Events: 
NONE. 
Present Weather Detector:  OK