Setting up the Vaisala WXT520.

Three general areas of measurement:
WIND is wind speed and direction 
PTU is Pressure Temperature and hUmidity
RAIN is rain and hail

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RS232 Wiring:
Instrument xmt = term 3  (TX- )  [connect to Dsub 2]
Instrument rcv = term 5  (RXD )  [connect to Dsub 3]
Signal ground  = term 6  (SGND)  [connect to Dsub 5]

Voltage 5-32VDC = term 20  (VIN+)
Voltage in gnd  = term 19  (VIN-)

In wiring on Mt. Toro, power ground and signal ground will be tied together.  (Jumper between term-6 and term-19)

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Met station parameters to be returned regularly:

Wind direction  (degrees)
Wind speed - avg  (knots)
Wind speed - max  (knots)

Barometric pressure  (inHg)
Air temperature  (degrees C)
Relative humidity  (% humidity)

Rain amount  (in)
Rain intensity  (in/hour)
Hail amount  (hits/in^2-hour)
Rain peak intensity  (in/hour)


Instrument is setup to default to the above parameters by following the following guidelines.

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Commands:

sent in format of "device address,command,argument(s)<cr><lf>

device address	= 0 for instrument D4740021
commands:
general setup	= XU
WIND setup	= WU
PTU setup	= TU
RAIN setup	= RU
supervisor	= SU


the <cr><lf> response terminator  = ^m^j


Set comm parameters line:
0XU,M=Q,T=0,C=2,I=5,B=19200,D=8,P=N,S=1^m^j

M: Mode (Q=NMEA polled mode)
T: Test mode (0=off)
C: Serial interface (2=RS232)
I: Automatic composite data interval (seconds)
B: Baud rate
D: Data bits
P: Parity
S: Stop bits


Sampling commands:
0## where ## =
WU	for wind sensor settings commands
TU	for PTU sensor settings commands
RU	for rain sensor settings commands
SU	for supervisor (informational) settings commands


0WU,R=1111111101001100  [sets all data to be returned when polled, but only the above three wind fields in composite string]
0WU,I=5,A=3,G=1,U=N,D=0,N=W,F=4


0TU,R=1111111111010000  [sets all data to be returned when polled, but only the above three AT/RH, baro fields in composite string]
0TU,I=10,P=I,T=C


0RU,R=1111111110110010  [sets all data to be returned when polled, but only the above three precipitation fields in composite string]
0RU,I=15,U=I,S=I,M=T,Z=M,X=10000,Y=100


0SU,R=0011100000111000  [sets all data to be returned when polled, but only the above three precipitation fields in composite string]
0SU,I=15,S=Y,H=N


Output string from above setup:
$WIXDR,A,021,D,1,S,0.5,N,1,S,0.6,N,2,C,72.8,F,0,H,48.3,P,0,P,29.98,I,0,V,0.000,I,0,R,0.00,I,0,V,0,I,1,R,0.00,I,2,U,14.2,V,1,U,3.507,V,2,G,Toro,,4*38
$WIXDR,A,021,D,1,S,0.6,N,1,S,0.8,N,2,C,72.8,F,0,H,48.3,P,0,P,29.98,I,0,V,0.000,I,0,R,0.00,I,0,V,0,I,1,R,0.00,I,2,U,14.2,V,1,U,3.507,V,2,G,Toro,,4*35
$WIXDR,A,034,D,1,S,0.7,N,1,S,1.3,N,2,C,72.8,F,0,H,48.3,P,0,P,29.98,I,0,V,0.000,I,0,R,0.00,I,0,V,0,I,1,R,0.00,I,2,U,14.2,V,1,U,3.507,V,2,G,Toro,,4*3A

Format:
$WIXDR = Start of message ($)  Device type (WI=weather instrument)  transducer response identifier (XDR) .....data fields ...... checksum delimiter (*) checksum

Header,XDCRtype,value,unit,XDCRid,XDCRtype,value,unit,XDCRid,XDCRtype,value,unit,XDCRid,....,XDCRtype,value,unit,XDCRid,,XDCRtype,value,null,XDCRid*

In above sring, there are 13 total values:

Wind direction=A,034,D,1,
where
XDCRtype	= A	= Angular displacement (wind)
value		= 034
unit		= D	= Degrees
XDCRid		= 1	= Transducer id for Avg Wind Direction

Wind speed=S,0.7,N,1,
XDCRtype	= S	= Speed (wind speed)
value		= 0.7
unit		= N	= Knots
XDCRid		= 1	= Transducer id for Avg Wind Speed


Wind speed max=S,1.3,N,2,
XDCRtype	= S	= Speed (wind speed)
value		= 1.3
unit		= N	= Knots
XDCRid		= 2	= Transducer id for Max Wind Speed


Air temp=C,72.8,F,0,
XDCRtype	= C
value		= 72.8
unit		= F	= Farenheit (should be Celsius!!)
XDCRid		= 0	= Transducer id for Temperature


Humidity=H,48.3,P,0,
XDCRtype	= H	= Humidity
value		= 48.3
unit		= P	= Percent humidity
XDCRid		= 0	= Transducer id for Humidity


Barometric pressure=P,29.98,I,0,
XDCRtype	= P	= Pressure
value		= 29.98
unit		= I	= Inches mercury (inHg)
XDCRid		= 0	= Transducer id for Pressure


Rain amount=V,0.000,I,0,
XDCRtype	= V	= Precipitation accumulation
value		= 0.00 
unit		= I	= Inches 
XDCRid		= 0	= Transducer id for Accumulated Rainfall 


Rain intensity=R,0.00,I,0,
XDCRtype	= R	= Rain intensity 
value		= 0.00 
unit		= I	= Inches per hour (in/hr) 
XDCRid		= 0	= Transducer id for Rain Intensity 


Hail amount=V,0,I,1,
XDCRtype	= V	= Precipitation accumulation
value		= 0
unit		= I	= Hits/square inch (hits/in^2)
XDCRid		= 1	= Transducer id for Accumulated Hail


Rain peak intensity=R,0.00,I,2,
XDCRtype	= R	= Rain intensity
value		= 0.00
unit		= I	= Inches per hour (in/hr) 
XDCRid		= 2	= Transducer id for Rain Peak Intensity


Supply voltage=U,14.2,V,1,
XDCRtype	= U	= Voltage
value		= 14.2
unit		= V	= VDC
XDCRid		= 1	= Supply Voltage


Reference voltage=U,3.507,V,2,
XDCRtype	= V	= Voltage
value		= 3.507
unit		= V	= VDC
XDCRid		= 2	= 3.5V Reference Voltage


Information=G,Toro,,4
XDCRtype	= G	= Generic
value		= Toro
unit		= null
XDCRid		= 4	= Transducer id for Generic Field