Young 32400 SERIAL INTERFACE User manual

METEOROLOGICAL INSTRUMENTS
INSTRUCTIONS
R.M. YOUNG COMPANY 2801 AERO PARK DRIVE, TRAVERSE CITY, MICHIGAN 49686, USA
TEL: [phone] FAX: [phone] WEB: www.youngusa.com P/N: 32400-90
REV: R073117
SERIAL INTERFACE
MODEL 32400

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32400-90(R)
MODEL 32400
SERIAL INTERFACE
SERIAL INTERFACE SPECIFICATION SUMMARY*
Wind Speed Input:
Sensor Type: AC Frequency Generator
Sensitivity: 50mV p-p at 10Hz
Range: 0-2000 Hz
Wind Direction Input:
Sensor Type: Potentiometer
Range: 0-5000mV = 0 to 355 degrees
Excitation: 5000mV (limited to 5 mA)
Voltage Inputs (Auxiliary Sensor Inputs):
Resolution: 12-bit
VIN1 and VIN2 0-1000mV
VIN3 and VIN4 0-5000mV
Voltage Outputs:
OUT1 0-5000mV 0-100 m/s wind speed
OUT2 0-5000mV 0-360° wind direction
Serial Output: Full duplex RS-232,
Half duplex RS-485 (2 mS turnaround),
Baud: 1200, 4800, 9600, 19.2K, &
38.4K, 8 data, 1 stop, no parity
Operating Temp: -50°C to 50°C
Power: 11 to 30 VDC, 40 mA
Mounting: Stainless steel U-bolt mounting clamp
ts vertical pipe 25-50 mm (Ø1-2 in)
(1 inch IPS (Ø1.34 inch actual)
Size: 7.50” (19.0cm) H
3.00” (7.6cm) W
3.00” (7.6cm) D
*Specications subject to change
1.0 INTRODUCTION
The Model 32400 SERIAL INTERFACE measures wind speed and
direction signals from YOUNG sensors and signals from four general
purpose voltage inputs. The voltage inputs may be used with YOUNG
temperature, humidity, barometric pressure, precipitation, or other
sensors. One of the voltage inputs may also be used with a tipping
bucket precipitation gauge. These input signals are converted into
scaled values and placed in a serial string, which is output at up to
15 hertz.
The serial output is available in several serial data formats in either full
duplex RS-232 or half-duplex RS-485 signals. Both continuous and
polled serial outputs are available. When polled, up to 16 units can
be networked together. For marine applications the 32400 produces
standard NMEA serial output sentences. Calibrated voltage outputs
for wind speed and direction are also provided when the 32400 is
connected to a YOUNG wind sensor.
2.0 INSTALLATION
The 32400 is supplied in a weather-resistant enclosure that mounts
with a stainless steel U-bolt that will t a 25 to 50 mm (1-2 in.) diameter
vertical pipe. Refer to the WIRING DIAGRAM for electrical connection
details and jumper settings.
3.0 OPERATION
Operation begins automatically when power is applied. Jumper
settings congure the 32400 for common output formats as well as
output type. Input signal connections are dependent upon the serial
output format.
3.1 JUMPER CONFIGURATIONS
W1 JUMPERS A, B, and C, determine serial output format. Jumper
configurations and associated output format are listed below:
1 signies that jumper is installed, 0 signies that jumper is omitted.
See the SERIAL FORMAT DIAGRAM for more details.
A B C SERIAL OUTPUT FORMAT (Baud Rate, Output Rate)
0 0 0 ASCII Ouput (9600, 2Hz)
001Polled ASCII (9600)
0 1 0 NMEA1 (4800, 2 Hz)
0 1 1 NMEA2 (4800, 2 Hz)
1 0 0 RMYT (9600, 15 Hz)
1 0 1 PRECIP (9600, 15 Hz)
1 1 0 PRECIP POLLED (9600)
1 1 1 SOFTWARE Mode (set by user, see section 4.2)
ASCII and POLLED ASCII are general purpose outputs that may
be used with the YOUNG 26800 or devices that can communicate
serially.
NMEA1 and NMEA2 outputs are generally for marine applications.
NMEA1 produces a “$WIMVW” string containing speed and direction
values.NMEA2 produces both a “$WIMVW” and “$WIXDR” string,
the latter containing temperature, humidity and pressure values.
RMYT is a binary format for use with the YOUNG Wind Tracker.
PRECIP and PRECIP POLLED congure VIN4 as a special input to
count tipping bucket precipitation gauge switch closures. (Requires
a 10K ohm resistor from VIN4 to EXC terminal.)
SOFTWARE mode allows output format and other parameters to
be set using serial commands. Please see section 4.0 SERIAL
COMMUNICATION and the SERIAL FORMAT DIAGRAM for more
information.
W2 & W3 JUMPERS determine output connection type. Only one
connection type may be used at a time. Please refer to the WIRING
DIAGRAM for jumper location and connection details.
JUMPERS OUTPUT TYPE
VOUT
Calibrated output for wind speed and direction
OUT1 0-5000mV = 0-100 m/s Wind Speed
OUT2 0-5000mV = 0-360 degrees Wind Direction
232 RS-232 full duplex serial
485 RS-485 half duplex serial
3.2 SIGNAL INPUTS
The 32400 has two special inputs for wind speed and direction from
YOUNG wind sensors and four voltage input channels for connection
to temperature, humidity, barometric pressure, precipitation, or other
sensors. For best performance, sensors should be installed within
3m (10ft.) of the 32400.
Measurements from the voltage input channels are converted to
numerical values (0-4000) when ASCII, POLLED ASCII, PRECIP,
or PRECIP POLLED are used. VIN1 and VIN2 full scale input is
1000mV DC (serial value = input mV x 4); VIN3 and VIN4 full scale
input is 5000mV (serial value = input mV x 0.8). Note that VIN4 is
used to count tipping bucket precipitation sensor tips when PRECIP
or PRECIP POLLED are used.
When NMEA1 or NMEA2 are used the measurements from the
voltage input channels are converted to following:
VIN1 (0 to 1000mV must = -50 to +50 C),Temperature (C);
VIN2 (0 to 1000mV must = 0 to 100%), Humidity (%);
VIN3, Barometric Pressure (hPa);
VIN4, not used. [Wind speed, (Knots)]
Please refer to SERIAL FORMAT DIAGRAM and WIRING DIAGRAM
in the back of this manual for additional details.

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32400-90(R)
4.0 SERIAL COMMUNICATION
The 32400 uses either full-duplex RS-232 or half-duplex RS-485
signals for serial communication. RS-232 is the most simple and
operates up to distances of 30m (100ft). The RS-485 option is
preferred in electrically noisy environments, in applications where
multiple units must be networked, or in NMEA marine applications
where RS-485 signals are required.
The full duplex RS-232 connection may transmit and receive serial
data at the same time.
The RS-485 connection is half-duplex meaning the unit cannot
transmit and receive at the same time. The 32400 internally manages
the switch between modes.
Many applications require the 32400 to transmit only. However,
RS-485 applications that require polling the 32400 or sending
commands to it require that the externally connected serial devices
must be capable of managing its own half-duplex switching from
transmit to receive.
At low baud rates with proper cable installation and connections,
transmission distances up to 7km (4mi) are possible using RS-485.
Baud rates of 1200, 4800, 9600, 19.2K, and 38.4K baud are
available. Most jumper-selected output formats force the baud rate
to a predetermined value. All serial signals use 1 start, 8 data, and
1 stop bit. Any externally connected serial device must be set to the
same baud rate as the 32400.
4.1 POLLING
When the serial output format is ASCII POLLED or PRECIP POLLED
(See the SERIAL FORMAT DIAGRAM), the 32400 sends data only
when it receives a serial polling command: “Mc!” where ‘c’ is the
unique address of the unit. The default address is ‘A’ but any alpha or
numeric character may be used (section 4.2 SERIAL COMMANDS).
4.2 SERIAL COMMANDS
Serial commands set operating parameters and report settings.
Jumper W1 must be configured for SOFTWARE mode for serial
command settings to be retained, otherwise default settings
based on jumper configuration will take effect at next power up.
Commands may be sent using a PC and simple communications
programs such as HyperTerm or any other properly configured
serial device. All commands that begin with CMD must end with
a carriage return (ASCII 13).
Commands may be sent at any time but it may be more convenient
to pause 32400 serial output. This is especially necessary with
half-duplex RS-485 communication.
Please refer to the table on the following page for commands
and definitions.
5.0 MAINTENANCE
The 32400 requires no maintenance in normal use.
Periodic inspection is recommended to verify correct operation.
6.0 WARRANTY
This product is warranted to be free of defects in materials and
construction for a period of 12 months from date of initial purchase.
Liability is limited to repair or replacement of defective item. A copy
of the warranty policy may be obtained from R. M. Young Company.
7.0 CE COMPLIANCE
This product complies with European CE requirements for the EMC
Directive. Please note that shielded cable must be used.

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32400-90(R)
SERIAL COMMANDS TABLE
Command Description Notes:
CMD100 OPERATE Places unit in continuous or polled operation
CMD110 PAUSE Interrupts/pauses operation
CMD200 n DAMPING (0=NONE, 1=FAST, 2=SLOW) Determines compass measurement averaging (32500 Only)
CMD210 n FORMAT:
0 ASCII
1 POLLED ASCII
2 NMEA (KTS, DIR)
3 NMEA (KTS, DIR, TEMP, RH, BARO)
4 RMYT
5 PRECIP
6 PRECIP POLLED
7 ASCII 2
9 DIAGNOSTIC
Determines serial output format.
See section 3.1 for more detailed information.
PRECIP formats substitute tipping bucket precipitation counts for
the VIN4 voltage measurement.
ASCII 2 omits VIN measurement values from the output string
CMD220 n OUTPUT RATE (0=15Hz, 1=0.1Hz, 2=2Hz) The rate at which serial data strings are sent.
CMD230 c POLL CHARACTER (0-9, A-Z) Sets the unique, single alphanumeric character polling address
CMD240 nn BAUD RATE:
12 = 1200, 48 = 4800, 96 = 9600,
192 = 19200, 384 = 38400
Selects one of several preset baud rates. If you change baud rate
while connected, your external device must also be changed in
order to continue communicating with the 32400
CMD250 n INPUT TYPE (1 = PULSE/POT, 2 = VIN3/VIN4) Determines wind speed & direction inputs to use for output
calculation. Type 2 requires 0 to 5000 mV = 0 to 100 m/s (VIN1)
and 0 to 540 degrees (VIN2). Type 2 typically used for 86000 family
of 2D Ultrasonic Anemometers.
CMD260 nnnn BARO RANGE LOW (hPa) Sets barometer low range at 0.0VDC (0500 hPa default)
CMD270 nnnn BARO RANGE HIGH (hPa) Sets barometer high range at 5.0VDC (1100 hPa default)
CMD280 nnn PROPELLER PITCH (mm/rev) Sets sensor cup wheel/propeller pitch
03002: 750 mm/rev
04101/4106/05103/05106: 294 mm/rev (default)
05108: 500 mm/rev
05305: 307 mm/rev
CMD900 REPORT PARAMETER SETTINGS Returns list of current settings in unit
CMD910 START COMPASS CALIBRATION See section 3.1 (32500 only)
CMD920 STOP COMPASS CALIBRATION See section 3.1 (32500 only)
X Alternative command to enter OPERATE mode Places unit in continuous or polled operation
3xESC Alternative command to PAUSE Interrupts/pauses operation
3xCNTL-S Alternative command to START calibration See section 3.1 (32500 only)
3xCNTL-X Alternative command to STOP calibration See section 3.1 (32500 only)

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32400-90(R)
SERIAL OUTPUT FORMATS
MODEL 32400

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32400-90(R)
WIRING DIAGRAM
MODEL 32400 JUMPER CONFIGURATIONS & POWER

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32400-90(R)
SERIAL WIRING CONNECTION
MODEL 32400

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32400-90(R)
WIRING DIAGRAM
Output to 06201 Wind Tracker or 06206 Marine Wind Tracker

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32400-90(R)
WIRING DIAGRAM
TYPICAL APPLICATION WIRING

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WIRING DIAGRAM
NMEA2 TYPICAL WIRING
WHEN USING NMEA2 FORMAT
SENSORS MUST BE CONNECTED AS SHOWN
FOR PROPER DATA REPORTING