USER'S GUIDE____________________________________________________________________
78 __________________________________________________________________ M210482EN-D
3RD LINE
The second line of the message is a backscatter data line.
Example:
D
1
D
2
D
3
D
4
........................D
64
where
D = A single, ASCII coded hexadecimal character O ... F, where
each bit of the 4-bit nibble of the hex character expressed in a
binary form represents one range gate.
D
1
= Represents the four lowest 15 m (approximately 50 ft) range
gates, that is, 45 m (appr. 0 ft, 50 ft, l00 ft, 150 ft).
D
2
= Represents the four next ones, that is, 60 m (appr. 200 ft,
250 ft, 300 ft, 350 ft), etc.
0 Indicates no detectable backscatter in four adjacent range gates
F Indicates backscatter in all four range gates
8 Indicates backscatter in the lowest range gate only
1 Indicates backscatter in the highest range gate only
All other characters indicate a gate-by-gate combination of backscatter
according to the binary nibble, converted to hexadecimal.
CT25K Data Messages
Ceilometer CL31 includes two Ceilometer CT25K data messages. These
are data message No. 1 and data message No. 6.
CT25K Data Message No. 1
This message is intended for cloud height/vertical visibility measurement
when no other measurement information is desired. The message
includes the most elementary status information, which enables a host
system or operator to see that no warnings or alarms are present. An
example of data message No.1 is presented below:
CTA2010 1st line 11 char.
30 01230 12340 23450 FEDCBA98 2nd line 31 char.
3rd line 3 char.
------------------
total 44 characters
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