Vaisala CL31 - Page 85

Chapter 5 ________________________________________________________________ Operation
VAISALA_______________________________________________________________________ 83
An example of the 'X1TA' telegram and a message interpretation are
presented below:
X1TA_8_015_00.00.00_00:00_00875_11150_NODET_0100_0325_NOD
T_11300_11600_+025_ft_01_00000000_96  
where

= Start-of-text character
X = Sensor type (X LD40)
1 = Sensor ID number (0 to 9..ABC..MN)
TA = Text telegram
8 = Instrument type, Always 8 = LD40
015 = Telegram update time or message interval in seconds
00.00.0
0
= Always (Date N/A))
00:00 = Always (Time N/A)
00875 = First cloud layer
11175 = Second cloud layer
NODE
T
= Third cloud layer (in this case: not detected)
0100 = Penetration depth of laser beam into first cloud layer
0325 = Penetration depth of laser beam into second cloud layer
NODT = Penetration depth of laser beam into third cloud layer
11300 = Vertical visibility
11600 = Maximum range of detection
+025 = Cloud height offset (in this case the ceilometer is situated
25 ft above the runway level)
f = Dimensions of all values between byte 26 and byte 76 (ft or
m_)
00 = Always (Precipitation index. N/A)
000000
00
= System status and messages
96 = Checksum (This value is only an example; the correct value
may be different from this one.)

= Carriage return + Line feed

= End-of-transmission character
NOTE
The notation '_' stands for a space character.