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Model 8339 Ceilometer
User’s Manual
24
8339 ASOS CM Command
The 8339 ASOS CM disables automated control of heaters for keeping freezing and solid precipita-
tion from blocking critical sensing elements. The sensor, after processing the command, will energize
the heaters. To disable manual override of energizing the heater, a CL, CN or CR command must be
sent to the Ceilometer.
Table 18. Responses to ASOS CM Command
Position
Description
Value
1
Start of
Transmission
STX
2
Sensor ID
(ASCII)
C
3
Command
Identifier
M
4
Sensor Heater
Energized
1 heater is energized
5-6
Checksum
CC
7
End of Text
ETX
8
Carriage Return
CR
9
Line Feed
LF
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