Vaisala LT31 - Message 4 - Vaisala System Standard Message

User's Guide ______________________________________________________________________
176 _________________________________________________________________ M210667EN-C
OK
LM Sensor: OK
Background luminance sensor: OK
window cont: 3
contamination compensation: ON
luminance: 11914 uc: 11557 backscatter: 0
temperature: CPU: 29.4 hood: 25.7
heaters: hood: ON/0 dew: ON/0
voltage: +5Va: 4.9 +5Vd: 5.0 +12V: 11.9
dew heater current: 0
free memory: 499276 V5iso: ON raw:00002F / 469
E
X
CSUM
E
T
C
R
L
F
where
!
= Start of the heading
LT = LT31 sensor identifier
1 = Unit identifier, if the ID is not defined it is replaced by a
space character
"
= Start of the text
MESSAGE BODY
#
= End of the text
CSUM = Checksum CRC16
$
= End of the transmission
-*
= CR + LF
The amount of characters in the message is approximately 975. The
transmission times for 975 characters are: 33 s at 300 bps (10-bit char),
4 s at 2400 bps, 1 s at 9600 bps.
Message 4 - Vaisala System Standard
Message
Message 4 is defined according to the Vaisala system standard format.
All units in the message are SI units. The message format is as follows:
!LT1"VIS(02000(AL(0)))BL(00100(AL(0)))#CSUM$-*
where
!
= Start of the heading
LT = FS11 sensor identifier
1 = Unit identifier, if the ID is not defined it
is replaced by a space character
"
= Start of the text
VIS(02000(AL(0))) = Visibility identifier and MOR value (unit
meter, 1 min average) and alarm status
related to visibility value