USER'S GUIDE ____________________________________________________________________
84 ___________________________________________________________________ M211187EN-C
MITRAS Double Baseline
The MITRAS Double Baseline emulation mode is selected with
command
SET MESSAGE TYPE MITRAS_DB
. The emulated Vaisala
MITRAS Transmissometer message is presented below:
∀
ID 1 V 4550 B ///// S010101
−∗#
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-
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--
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¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦___receiver 2 status
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦___receiver 1 status
¦ ¦ ¦ ¦ ¦ ¦ ¦¦___transmitter status
¦ ¦ ¦ ¦ ¦ ¦ ¦____S, status heading
¦ ¦ ¦ ¦ ¦ background luminance value
¦ ¦ ¦ ¦ ¦___B,background luminance heading
¦ ¦ ¦ ¦_____ visibility m, 1 min average
¦ ¦ ¦________V, visibility heading
¦ ¦________unit ID (first character of unit identifier only)
¦_________ID, start indicator
The total amount of characters in the message is 33. The transmission
times are: 1.3 s at 300 bps (10-bit char), 0.17 s at 2400 bps, 0.04 s at
9600 bps.
The binary status is in hexadecimal notation. The status bits emulate the
MITRAS status as follows.
Transmitter
status correspondence between MITRAS and FS11:
BIT
MITRAS
FS11
BIT.0=1
MEAS MODE
ON
II
BIT.1=2
CONT/OTHER
OFF
BIT.2=4
OPTICAL SURFACE
Window contamination
BIT.3=8
POWER SUPPLY
Power supply failure
BIT.4=1
HEATING
OFF
I
BIT.5=2
FLASH LAMP
LED failure
BIT.6=4
BL METER
BL sensor status (ON/OFF)
BIT.7=8
MEASUREM. LOOP
SIGNAL
OFF
