CS120A and CS125 Visibility and Present Weather Sensors
25
STX and ETX are hexadecimal command characters.
Refer to Appendix
Example C code of the CRC-16 checksum
(p. B-1)
, for the checksum algorithm.
11.1 Visibility only messages
Basic Format, Visibility Only
ST
X
M
es
sag
e I
D
Se
ns
or ID
Sy
ste
m
sta
tu
s
V
isib
ility
dis
ta
nc
e
V
isib
ility
un
its
Che
cks
um
(C
CIT
T)
ET
X
Car
riag
e
re
tu
rn
Li
ne f
eed
0x02
0
M
o
r F
XXXX
0x03
0x0D
0x0A
0 0 0 19837 M FC92 (Example message, visibility units = metres)
In the following example messages where shown message
intervals are 12 seconds and visibility units are in metres unless
otherwise indicated.
Partial Format, Visibility Only
ST
X
M
es
sag
e I
D
Se
ns
or ID
Sy
ste
m
sta
tu
s
M
es
sag
e
in
te
rv
al
V
isib
ility
dis
ta
nc
e
V
isib
ility
un
its
U
se
r al
ar
m
s
Che
cks
um
(C
CIT
T)
ET
X
Car
riag
e
re
tu
rn
Li
ne f
eed
0x02
1
M
o
r F
0 0
XXXX
0x03
0x0D
0x0A
1 0 0 12 20405 M 0 0 EF07 (Example message)
NOTE
NOTE
NOTE
