Vaisala FS11P - MITRAS Double Baseline

User's Guide _______________________________________________________________________
92 ___________________________________________________________________ M211107EN-C
Receiver status correspondence between MITRAS and FS11P:
BIT
MITRAS
FS11P
BIT.0=1
MEAS MODE
ON
IV
BIT.1=2
CONT/OTHER
Any other FS11P alarm
BIT.2=4
OPTICAL SURFACE
OFF
BIT.3=8
POWER SUPPLY
OFF
BIT.4=1
HEATING
OFF
III
BIT.5=2
CALIBRATION
Receiver saturated
BIT.6=4
TEST
OFF
BIT.7=8
CONSISTENCY
OFF
For example, the status 4101 means that
I
4 = BL sensor ON
II
1 = ON
IV
1 = ON
In other words, LM21 Background Luminance Sensor is set as the
background luminance sensor.
MITRAS Double Baseline
The MITRAS Double Baseline emulation mode is selected with the
command SET MESSAGE TYPE MITRAS_DB. The emulated Vaisala
MITRAS Transmissometer message is presented below:
∀
ID 1 V 4550 B ///// S010101
−∗#
----------------------------------
¦ ¦ ¦ ¦ ¦ ¦ ¦¦ ¦___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.