Campbell Scientific CS135 Lidar Ceilometer - Manual (Page 61)

User Guide
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If detection status is 4 h1 = Vertical visibility as calculated
If detection status is 0 or 5 h1 = "/////"
h2 (5 characters) = 2nd Height
If detection status is 2 or 3 h2 = Second highest cloud base reported
If detection status is 4 h2 =
Height of highest signal detected
If detection status is 0, 1 or 5 h2 = "/////"
h3 (5 characters) = 3rd Height
If detection status is 3 h3 = Highest cloud base reported
If detection status is 0, 1, 2, 4 or 5 h3 =
"/////"
flags (8 characters) = Alarm or warning information 4-byte hex coded
Description of the most significant alarm word (left side, bits going left to right). Each alarm
word is a hexadecimal sum of all the error bits.
Bit Description
8000 XXXX
Transmitter shut-off
4000 XXXX Transmitter failure
2000 XXXX Receiver failure
1000 XXXX DSP, voltage or memory failure
0800 XXXX Reserved for future use
0400 XXXX Reserved for future use
0200 XXXX Reserved for future use
0100 XXXX Reserved for future use
0080 XXXX Window contaminated
0040 XXXX Battery low
0020 XXXX Transmitter expire warning
0010 XXXX Heater or humidity sensor failure
0008 XXXX High radiance warning, also XXXX 0004
0004 XXXX DSP, receiver, or laser monitor failure warning
0002 XXXX Relative humidity > 85 %
0001 XXXX Light path obstruction, receiver saturation or receiver failure
Description of the second alarm word (bits going left to right)
Bit Description
XXXX 8000
Blower failure
XXXX 4000 Reserved for future use
XXXX 2000 Reserved for future use
XXXX 1000 Reserved for future use
XXXX 0800 Blower on
XXXX 0400 Blower heater on
XXXX 0200 Internal heater on
XXXX 0100 Units metres if on, feet if off.
XXXX 0080 Polling mode on
XXXX 0040 Working from battery
XXXX 0020 Always 0
XXXX 0010 Always 0
XXXX 0008 Tilt beyond limit set by user, default 45 degrees
XXXX 0004 High radiance warning, also 0008 XXXX
XXXX 0002 Reserved for future use
XXXX 0001 Reserved for future use
CR LF = Carriage Return + Line Feed