Chapter 5 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 163
Start
at Byte
No.
Content Description
1
!
Start of the heading (ASCII 1).
2 LT
LT31 sensor identifier.
4 1
Unit identifier, if the ID is not defined it is
replaced by a space character.
5
"
Start of the text (ASCII 2).
6 VIS
10000.0
MOR value, unit m, 1-min-average.
18 AL
00000000000000000000
Alarm status of the LT31 system (see Table 13
on page 164).
42
BL 01000
Background luminance identifier and BL value,
unit, cd m
-2
.
51
AL 0
Alarm status of the background luminance
sensor LM21.
55
#
End of the text (ASCII 3).
56 CSUM
Checksum CRC16.
60
$
End of the transmission (ASCII 4).
61
-*
CR + LF (ASCII 13 + ASCII 10).
The total amount of characters in the message is 62. The transmission
times are: 2.1 s at 300 bps (10-bit char), 0.26 s at 2400 bps, 0.07 s at
9600 bps.