USER'S GUIDE  ____________________________________________________________________ 
74  ___________________________________________________________________ M211187EN-C 
The total amount of characters in the message is 43. The transmission 
times are: 1.5 s at 300 bps (10-bit char), 0.19 s at 2400 bps, 0.05 s at 
9600 bps. 
Alarm Status Codes 
The alarm status codes are listed in Table 11 below. 
Table 11  Alarm Status Codes 
measurement value still valid 
-Window contamination increased 
-Transmitter LED aging 
-Backup battery voltage low 
Error (visibility measurement 
value NOT shown, replaced 
-Memory error 
Alarm (visibility measurement 
value NOT shown, replaced 
with /////) 
-Communication error in the sensor 
-Internal monitoring alarm value  
 exceeded 
-Measurement signal saturated or  
 outside valid range 
-Surface temperature  
Indication of some abnormal 
situation (measurement value 
valid and shown) 
-AC (mains) off, operating on 
 battery 
-12 VDC output in short-circuit 
-Hood or dew heater problem 
NO alarm or warning  
(alarm is OFF)