model aio 2 all in one weather sensor

model aio 2 all in one weather sensor
MODEL AIO 2
ALL IN ONE WEATHER SENSOR
OPERATION MANUAL
Document No. AIO 2-9800 Rev. A3
1600 Washington Blvd.
Grants Pass, Oregon 97526
Telephone 541-471-7111
Facsimile 541-471-7116
Met One
Instruments
AIO 2-9800 Rev A3
Regional Sales & Service
3206 Main St. Suite 106
Rowlett, Texas 75088
Telephone 972-412-4715
Facsimile 972-412-4716
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Copyright Notice
AIO 2 Weather Sensor Manual
© Copyright 2015 Met One Instruments, Inc. All Rights Reserved Worldwide. No part of this publication
may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any other
language in any form by any means without the express written permission of Met One Instruments, Inc.
Technical Support
This manual is structured by customer feedback to provide the required information for setup, operation,
testing, maintaining, and troubleshooting your AIO 2 Weather Sensor. Should you still require support
after consulting your printed documentation, we encourage you to contact one of our expert Technical
Service representatives during normal business hours of 7:00 a.m. to 4:00 p.m. Pacific Standard Time,
Monday through Friday. In addition, technical information and service bulletins are often posted on our
website. Please contact us and obtain a Return Authorization (RA) number before sending any equipment
back to the factory. This allows us to track and schedule service work and to expedite customer service.
Please have your instrument serial number available when contacting the manufacturer.
Contact
Information:
Tel:
Fax:
Web:
Email:
AIO 2-9800 Rev A3
+ 541 471 7111
+ 541 471 7116
http:/www.metone.com
[email protected]
Address:
Met One Instruments, Inc.
1600 Washington Blvd
Grants Pass, Oregon 97526
U.S.A.
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Safety Notice
The contents of this manual have been checked against the hardware and software
described herein. Since deviations cannot be prevented entirely, we cannot guarantee
full agreement. However, the information in this manual is reviewed regularly and any
necessary corrections are included in subsequent editions. Faultless and safe operation
of the product presupposes proper transportation, storage, and installation as well as
careful operation and maintenance. The seller of this equipment cannot foresee all
possible modes of operation in which the user may attempt to utilize this
instrumentation. The user assumes all liability associated with the use of this
instrumentation. The seller further disclaims any responsibility for consequential
damages.
Electrical & Safety Conformity
The manufacturer certifies that this product operates in compliance with the following
standards and regulations:
FDA/CDRH This product is tested and complies with 21 CFR, Subchapter J, of the
Health and Safety Act of 1968 US 21 CFR 1040.10
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Table of Contents
1.
Introduction & Overview – AIO 2 All In One Weather Sensor ......................................................... 6
1.1.
Overview ........................................................................................................................................ 6
2.
Specifications ...................................................................................................................................... 7
3.
Unpacking & Installation .................................................................................................................... 8
3.1.
Unpacking ..................................................................................................................................... 8
3.2.
Deployment ................................................................................................................................... 9
3.2.1.
Tripod / Pipe top Installation:................................................................................................. 9
3.2.2.
Universal Mounting Arm Installation: ................................................................................. 12
3.3.
Input / Output Connections ....................................................................................................... 13
3.4.
Operational Checkout ................................................................................................................ 14
3.5.
Maintenance ................................................................................................................................ 14
3.6.
Setting Magnetic Declination .................................................................................................... 14
4.
User Selectable Options ................................................................................................................... 15
5.
User Interface .................................................................................................................................... 16
6.
Standard Configuration .................................................................................................................... 18
7.
Appendix A ........................................................................................................................................ 19
7.1.
Terminal Mode and SDI Commands ......................................................................................... 19
7.1.1.
H,h,? – Display Help Menu ................................................................................................... 19
7.1.2.
BV – Battery Voltage Printout Toggle On/Off ..................................................................... 19
7.1.3.
CV – Compass Measurement Printout Toggle On/Off ....................................................... 20
7.1.4.
ID – View / Set Instrument ID................................................................................................ 20
7.1.5.
ME –Metric or English Units................................................................................................. 20
7.1.6.
SU –Wind Speed Units .......................................................................................................... 21
7.1.7.
TU –Temperature Units ......................................................................................................... 21
7.1.8.
PU –Barometric Pressure Units ........................................................................................... 21
7.1.9.
RU –Rain Units ...................................................................................................................... 21
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7.1.10.
MD –Magnetic Declination.................................................................................................... 22
7.1.11.
OI –Output Interval ................................................................................................................ 22
7.1.12.
ST – Serial Trigger................................................................................................................. 23
7.1.13.
SA – SDI-12 Address ............................................................................................................. 23
7.1.14.
SC – Solar Calibration .......................................................................................................... 23
7.1.15.
RT – Output Record Type ..................................................................................................... 23
7.1.16.
RV – Software Version Number ........................................................................................... 23
7.2.
8.
Appendix B ........................................................................................................................................ 26
8.1.
9.
SDI-12 Commands ...................................................................................................................... 24
Theory of Operation ................................................................................................................... 26
Warranty / Service ............................................................................................................................. 27
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1.
Introduction & Overview – AIO 2 All In One Weather
Sensor
1.1. Overview
The AIO 2 Weather Sensor provides measurements of wind speed, wind direction,
ambient air temperature, relative humidity, and barometric pressure in a single,
compact, rugged unit. It integrates a folded-path, low-power sonic anemometer with a
precision thermistor temperature sensor, fast-response capacitive relative humidity
sensor, and a state-of-the-art barometric pressure sensor. It also includes an internal
flux-gate compass that allows for automatic alignment of wind direction to magnetic
north, regardless of the sensor’s orientation.
The small footprint and power efficiency of the AIO 2 make it ideal for remote regions,
urban environments, air quality networks, construction/remediation sites, and other
network applications. The unit can be used in permanent (cooperative weather
networks, schools, public information dissemination) or temporary (emergency
response, audit, research program support) installations.
Designed for maximum portability and utility, the AIO 2 is well suited for rapid
deployment and use by one person under all conditions. The unit may be mounted on a
tower, tripod or vehicle mast. Data output is a serial, digital message that can be
interfaced to most data logging systems.
The AIO 2 even has the capability to connect an external contact closure rain gauge
(such as the Met One 360 or 370) and/or solar radiation sensor (such as the Met One
096A-2). If these inputs are present, their measurements are then integrated into the
AIO 2 serial data output.
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2.
Specifications
Wind Speed



Range 0 to 60 m/s (0 to 134 mph)
Accuracy ±0.5 m/s or 5% of reading (1)
Resolution 0.1 m/s
Wind Direction
 Range 0 to 360°
 Accuracy ± 5° (including Compass)
 Resolution 1.0°
Temperature
 Range -40 to +60 °C (-40 to +140 °F)
 Accuracy ±0.2°C (2)
 Resolution 0.1°C
Relative Humidity
 Range 0 to 100%
 Accuracy ±3% (3)
 Resolution 1.0%
Pressure
 Range 600 to 1100 hPa
 Accuracy ±0.5 hPa (3)
 Resolution 0.1 hPa
Alignment Compass
 Accuracy ±2°
 Resolution 1°
External Rain Gauge Input
 Resolution 0.25mm or 0.01”, user selectable
External Solar Radiation Sensor Input
 Measured in W/m2
Electrical
 Measurement Rate Output: 1 Hz
 Signal Output RS-232, RS-485, and SDI-12
 Power Requirements 8 to 36 VDC
30 mA nominal @ +12VDC
Environmental
 Temperature -40 °C to +60 °C (-40 to +140 °F)
 Humidity 0 to 100%
Notes:
1. Whichever is greater.
2. 0C to 60C. +/- 0.5C from -40C to 0C.
3. At 25 °C.
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3.
Unpacking & Installation
3.1. Unpacking
Any damages incurred to the equipment during shipping are the responsibility of the
carrier. If any damage to the shipment is noticed before unpacking, a claim must be filed
with the commercial carrier immediately. You should follow any special unpacking
instructions provided by the carrier as you then carefully remove all items from the
containers and inspect each component. It is recommended to document and
photograph all damaged packages and items before, during, and after unpacking them.
Unpack the AIO 2 and accessories and make a visual inspection of the contents;
contact your supplier if anything is missing. The AIO 2 Weather Sensor ships with the
following items:



AIO 2 All In One Weather Sensor.
Calibration certificate.
Operation manual (this document).
Optional Accessories that may be purchased include:
 10523 ¾” IPS pipe vertical mounting adaptor
 10106 Universal mounting arm
 10600 Interface station – provides wiring terminals, 12VDC power, USB and DB9
serial connections.
 WeatherView Software
 USB Driver CD
 Comet Terminal Software CD
The required 10624 signal cable is sold separately. It is custom built to the desired
length.
Contact Met One Instruments (see the Technical Support section at the beginning of
this manual) to arrange for any replacement items needed.
Please keep the carton(s) and associated packing materials for reuse.
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3.2. Deployment
3.2.1. Tripod / Pipe top Installation:
The AIO 2 can be quickly and easily deployed on top of a Met One 905 tripod or any
other vertical ¾” IPS pipe using the optional 10523 vertical mount.
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Route the 10624 signal cable connector end through the 10523 mount adaptor as
shown below.
Plug the cable connector into the base of the AIO 2 and turn the connector sleeve
clockwise (as seen from below the sensor) until tight. Then slide the AIO 2 onto the top
of the 10523 mount adaptor and tighten the two slotted base set screws as shown
below.
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Position the cable in the slot on the side of the mount and then slide the assembly onto
the tripod mast or pipe. Tighten the 2 set screws on the 10523 mount to affix it to the
tripod/pipe.
The AIO 2 includes an internal alignment compass so the adaptor and AIO 2 sensor can
face any direction and still correctly read wind direction (as referenced to Magnetic
North). The MD command can be used to set a magnetic declination to reference the
wind direction reading to True North. See section 3.6 for more details about setting the
magnetic declination.
Run the signal cable from the mount to the data collection device being used (such as a
data logger or computer) following the wiring connections listed in section 3.3.
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3.2.2. Universal Mounting Arm Installation:
If a tripod or ¾” pipe is not available, the optional 10106 Universal Mounting Arm can be
used to mount the AIO 2 horizontally or vertically to a variety of vertical posts or pipes.
The included hose clamps will fit up to 3” diameter posts, but larger user supplied hose
clamps can be substituted to mount the arm to larger diameter structures.
10106 Universal Mounting Arm Orientation Options
Horizontal
Vertical
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3.3. Input / Output Connections
10624 Cable Wire Color Designations:
RED
BLK
BLU
GRN
WHT
BRN
YLW
GRY
ORN
VIO
WHT/BRN
POWER POSITIVE (8-36VDC, 30mA nominal @ 12VDC)
POWER COMMON
SDI-12
SIGNAL COMMON
RS-232 TX
RS-232 RX
RS-485 +B
RS-485 -A
EXTERNAL RAIN GAUGE OPTION INPUT
EXTERNAL SOLAR RADIATION SENSOR OPTION INPUT
SHIELD (must be grounded for transient protection to function)
Warning: Do not short any of the signal or power wires to ground or to each other.
Maximum Cable Length Considerations:
The maximum recommended cable length depends on the communication protocol to
be used:
RS-232C
50FT maximum
RS-485
4000FT maximum
SDI-12
200FT maximum
Connecting to the optional 10600 Interface Base Station
The optional 10600 Interface Base Station provides:
o 12VDC power to the sensor
o Convenient wiring terminal blocks for the AIO 2 sensor
o Connection points for optional external Rain gauge and Solar radiation
sensors.
o USB and DB9 serial port outputs for easy Computer connectivity.


See the included 10600 manual for use and connection details.
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3.4. Operational Checkout
Connect the AIO 2 to your data logger or recording electronics. Connect power to the
sensor cable per wiring diagram in section 3.3. The AIO 2 will automatically start
streaming its serial output and your recording electronics should start displaying or
recording measurements from the AIO 2. Verify the data seems reasonable by
comparing it to data from a local weather source. If the data looks OK, the unit is in
operation. If data is questionable, contact Met One Instruments, Inc. Service
Department for further guidance (see the Technical Support section at the beginning of
this manual).
3.5. Maintenance
The unit has no moving parts and therefore requires no periodic maintenance for wear
items. It is recommended that the data be checked every 6 -12 months to be sure there
has been no failure of any of the electrical components. This can be done by placing a
small container (at least 12inch diameter) over the sensor to zero check the wind
measurement. The ambient temperature, relative humidity, and pressure readings can
be verified against collocated devices such as the Met One 083E-1-35 T/RH sensor and
Met One 092 BP sensor.
3.6. Setting Magnetic Declination
The internal flux gate compass automatically corrects the wind direction in the AIO 2 to
magnetic North. This means that the unit will not require directional alignment or
orientation upon deployment.
If it is necessary to measure wind direction referenced to True North it is important to
understand and know the magnetic declination of the area in which the sensor is being
operated. The declination in the AIO 2 is factory set at zero degrees. To change this,
refer to the MD command instruction in section 7.1.10 for setting the Magnetic
Declination.
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4.
User Selectable Options
The following User Defined Options can be set following the instructions detailed in
Appendix A.
BV
CV
ID
MD
ME
OI
PU
RT
RU
RV
SA
SC
ST
SU
TU
Q
Battery Voltage Printout Toggle On/Off
Compass Reading Printout Toggle On/Off
View / Set Instrument ID
Set Magnetic Declination
Metric or English Units
Set Output Interval
Set Pressure Units
Output Record Type
Set Rain Units
Display Firmware Version Number
SDI Address
Solar Option Calibration Constant
Set Serial Trigger Address
Set Wind Speed Units
Set Temperature Units
Quit Terminal Mode and Save changes
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5.
User Interface
The output of the AIO 2 is a fixed length, comma delimited, serial data stream. The
serial output is factory set for 9600 baud, no parity, 8 data bits, 1 stop bit, and no flow
control. The output interval default is once per second. This may be changed using the
OI command (see Appendix A). The data is easily viewed and can be displayed and
captured using Met One Instruments’ Comet Software or other terminal communication
program.
An example of the standard output format is shown below:
000.6,272,+023.6,022,0974.3,000.00,0000,12.7,U0,*02257 CR/LF
Each parameter is a fixed length with leading zeros separated by a comma. The
string terminates with a Carriage Return and Line Feed. Field parameters are defined
as:
000.6,272,+023.6,022,0974.3,000.00,0000,12.7,U0,*02257 CR/LF
WS,WD,AT,RH,BP,RN,SR,BV,CONFIG,CheckSum
The wind speed, temperature, pressure and rainfall units can be changed with the
SU, TU, PU, and RU terminal commands respectively. Please refer to Appendix A
for more information.
NOTE: the internal alignment compass reading can be added to the output string using
the CV command; see Section 7.1.3 for details and an output string example.
The AIO 2 output can also be configured to emulate the Legacy AIO 102780 output data
format. An example of the Legacy AIO output format is shown below:
002.6, 219, +020.8, 042, 1013.2, *1787CR/LF
Each parameter is a fixed length with leading zeros separated by a comma and one
space. The string terminates with a Carriage Return and Line Feed. Field parameters
are defined as:
002.6,
WS
219,
WD
+020.8,
Temp
042,
RH
1013.2,
BP
*1787
Check Sum
Note: when displaying the pressure in In/Hg, there will be an extra leading zero
character but the fixed length of the field will not change.
A check sum parameter will be added to the end of the message (*9999).
The check sum is the addition of all the characters from the start of the message
through the first character preceding the asterisk (*). The check sum is expressed as a
decimal number. This is a 16 bit sum and should not overflow past 4 digits given the
number of characters in the output string.
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Polled data mode (RS232 or RS485)
The sensor can be set for polled data mode instead of continuous serial output by
setting the OI command to Zero, and using the serial trigger string to request a data
string. Refer to the ST terminal command in Appendix A for instructions on setting the
Serial Trigger.
SDI-12 Interface
In addition to the above communications methods, the sensor can be polled by an SDI12 Master Station for data. This operates completely independent of the RS232 or
RS485 communications and can be used in conjunction with those methods. Data are
polled using a series of SDI-12 commands. Please see appendix A for a list of
supported SDI commands. The default SDI Address for the AIO 2 is zero.
Please consult your data-logger manual for more information on SDI interfaces or call
Met One for additional help.
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6.
Standard Configuration
Serial Interface
The serial interface is fixed at 9600 Baud and configured for No Parity, 8 Data Bits and
1 Stop Bit, with no flow control.
Wind Speed
The Wind Speed unit choices are MPH or M/S. The default is M/S. The Speed range
for M/S is 0-60. The Speed range for MPH is 0-134.
Temperature
The Temperature unit choices are Degrees C or Degrees F. The default is Degrees C.
The range for Degrees C is -40 to +60, the range for Degrees F is -40 to +140.
Pressure
Pressure Range choices are In/Hg, Millibars, or mm/Hg, and the default is Millibars. The
Pressure range for Millibars is 600-1100, for In/Hg is 17.72 to 32.48, and for mm/hG is
450 to 825.
Precipitation Input
The Precipitation resolution can be 0.25mm/tip or 0.01”/tip. 0.25mm/tip is the default.
Solar Radiation Input
The Solar Radiation input units are watts per square meter. The default calibration
constant is 2 W/m2 per mV (1.000VDC = 2000 W/m2).
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7.
Appendix A
7.1. Terminal Mode and SDI Commands
RS232 / RS485 Terminal Mode Commands
Terminal mode is activated by entering three carriage return characters within a 2 second period.
Terminal mode times-out after 2 minutes of inactivity.
Successful entry into Terminal Mode will return an asterisk prompt:
7.1.1. H,h,? – Display Help Menu
BV
CV
ID
MD
ME
OI
PU
SA
SC
RT
ST
SU
TU
RV
RU
Q
- Battery Voltage Printout Toggle On/Off
- Compass Heading Printout Toggle On/Off
- View / Set Instrument ID
- Set Magnetic Declination
- Metric or English Units
- Set Output Interval
- Set Pressure Units
- SDI Address
- Solar Calibration
- Output Record Type
- Set Serial Trigger Address
- Set Speed Units
- Set Temperature Units
- Display Firmware Version Number
- Set Rain Units
- Quit command mode and save any changes
NOTE: The commands noted in this appendix will change both the RS232 and RS485 outputs.
The SDI-12 output can be configured independently. See pages below for SDI-12 commands.
7.1.2. BV – Battery Voltage Printout Toggle On/Off
This command enables or suppresses the Battery Voltage reading in the serial string output.
COMMAND
RESULT
BV<cr>
Report current setting
BV0<cr>
Battery Voltage Measurement removed from serial output
000.0,000,+024.5,045,0970.5,000.00,0000,M0,*02112
BV1<cr>
Battery Voltage Measurement enabled in serial output
000.0,000,+024.5,045,0970.5,000.00, 0000,12.0,M0,*02344
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7.1.3. CV – Compass Measurement Printout Toggle On/Off
This command enables or suppresses the Compass Reading in the serial string output.
COMMAND
RESULT
CV<cr>
Report current setting
CV0<cr>
Compass Measurement removed from serial output
000.0,000,+024.5,045,0970.5,000.00, 0000,12.0,M0,*02344
CV1<cr>
Compass Measurement enabled in serial output
000.0,000,+024.5,045,0970.5,000.00, 0000,12.0,240,M0,*0254
7.1.4. ID – View / Set Instrument ID
Read or Set the Instrument ID
COMMAND
RESULT
ID<cr>
Report the Instrument ID setting (provides help)
ID XX<cr>
Set Instrument ID to number from 1 to 99
7.1.5. ME – Metric or English Units
This command will set all units in the the serial port’s output to Metric or English
COMMAND
RESULT
ME<cr>
Report Units setting
ME0<cr>
Set Units to Metric (Default):
WS: m/s
AT: Deg C
BP: mbars
RN: mm
Set Units to English:
WS: MPH,
AT: Deg F
BP: inHg
RN: inches
ME1<cr>
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7.1.6. SU –Wind Speed Units
Read or Set this serial port’s output Units for Wind Speed
COMMAND
RESULT
SU<cr>
Report Units setting
SU0<cr>
M/S
SU1<cr>
MPH
7.1.7. TU –Temperature Units
Read or Set this serial port’s output Units for Temperature
COMMAND
RESULT
TU<cr>
Report Units setting
TU0<cr>
Fahrenheit
TU1<cr>
Celsius
7.1.8. PU –Barometric Pressure Units
Read or Set this serial port’s output Units for Pressure
COMMAND
RESULT
PU<cr>
Report Units setting
PU0<cr>
Millibars (Default)
PU1<cr>
Inches of Mercury
PU2<cr>
Millimeters of Mercury
7.1.9. RU –Rain Units
Read or Set this serial port’s output Units for Pressure
COMMAND
RESULT
RU<cr>
Report Units setting
RU0<cr>
mm (Default)
RU1<cr>
Inches
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7.1.10. MD –Magnetic Declination
The flux compass in the AIO 2 sensor provides Wind Direction to MAGNETIC north. Software in
the Interface allows the setting of a declination angle to correct the Wind Direction output to
TRUE north. It is recommended that this procedure be done in the lab, but can be done in the
field as well. Once the declination angle is set in the sensor, it is stored in non-volatile memory,
and does not have to be reset each time the sensor is fielded. The declination angle must be
reset only if the system is used in a different geographical location separated by many miles from
the location where the declination was originally set.
It is suggested that the magnetic declination be determined before performing this calibration.
Visit the following web site for help in determining the correct declination for your site:
www.ngdc.noaa.gov/geomag/declination.shtml
Click “Compute your declination”. On the next page, enter either zip code, or select country and city, then
click “Get Location” and then “Calculate”. Alternatively, you can enter longitude and latitude directly, and
then click “Calculate”. Declination is reported in Degrees, Minutes and Seconds. Divide minute’s value
by 60 to get decimal fraction of degrees (I.E. 50 minutes = 0.8 degrees). If the declination needs to be
adjusted, please use the MD command as shown below.
Read or Set the Magnetic Declination
COMMAND
RESULT
MD<cr>
Report Magnetic Declination setting
MDXX.X<cr>
Set Declination to XX.X Degrees
Note: West declination values are entered and reported as negative values.
7.1.11. OI –Output Interval
Read or Set the Output Interval for this serial port
Note: This command is not supported by SDI-12.
COMMAND RESULT
OI<cr>
Report Output Interval setting
OI0<cr>
For Serial Trigger (Address must be set with ST command).
OI1<cr>
Sensor Output every 1 second (Default)
OI2<cr>
Sensor Output every 2 seconds
OI3<cr>
Sensor Output every 5 seconds
OI4<cr>
Sensor Output every 15 seconds
OI5<cr>
Sensor Output every 30 seconds
OI6<cr>
Sensor Output every 60 seconds
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7.1.12. ST – Serial Trigger
Read or Set the Serial Trigger character string (Poll command)
COMMAND
RESULT
ST<cr>
Report Serial Trigger string setting (provides help)
ST XXXXXX<cr>
Set Serial Trigger
7.1.13. SA – SDI-12 Address
Read or Set the SDI-12 Address, used to poll data in SDI-12 mode.
COMMAND
RESULT
SA<cr>
Report SDI-12 Address string setting (provides help)
SAx<cr>
Set SDI-12 Address, where ‘x’ is in the range [0-9], [A-Z]
or [a-z] Case Sensitive.
7.1.14. SC – Solar Calibration
Read or Set the Solar Radiation Input Calibration Constant, units are in W/m2 per mV.
COMMAND
RESULT
SC<cr>
Report Solar Radiation Input Calibration Constant
Default is 2 W/m2 per mV (1.000V = 2000W/m2)
SCX.XXX<cr>
Set Solar Calibration Constant to x.xxx in W/m2 per mV.
7.1.15. RT – Output Record Type
Read or Set the Output Record type.
COMMAND
RESULT
RT<cr>
Report Output Record Type
RT1<cr>
Set Output Record Type to Met Record format (default).
RT2<cr>
Set Output Record Type to AIO format for compatibility
with legacy AIO 102780 systems.
7.1.16. RV – Software Version Number
Report the current Software Version Number
COMMAND
RESULT
RV<cr>
Report current Software Version
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7.2.
SDI-12 Commands
NAME
SDI-12
COMMAND
SENSOR RESPONSE
Address Query
?!
a<CR><LF>
Where a = address
Acknowledge Active
a!
a<CR><LF>
Where a = address
Send Identification
aI!
a13METONE AIO 2 2.0.0xxxxx<CR><LF>
Where a=address and xxxxx = S/N
Change Address
aAb!
b<CR><LF>
Where b = new address
Start Measurement
aM!
a0009<CR><LF>
Where a = address
Start Measurement with CRC
aMC!
a0009{crc}<CR><LF>
Where a = address and {crc} = CRC
Send Data
aD0!
a+bbb.b+ccc.c+ddd.d+eee.e<CR><LF>
Where a = address, bbb.b = wind speed,
ccc.c = wind direction, ddd.d = temperature, and
Send Data eee.e = relative humidity
aD1!
a+ffff.f+gggg.g+hhhh+ii.ii<CR><LF>
Where a = address, ffff.f = barometric pressure,
gggg.g = Rain Option, hhhh = Solar Option, and
ii.ii = Power Supply Voltage
Start Concurrent
Measurement
aC!
a00009<CR><LF>
Where a = address
Start Concurrent
Measurement with CRC
aCC!
a00009{crc}<CR><LF>
Where a = address and {crc} = CRC
Continuous Measurements
aR0!
a+bbb.b+ccc.c+ddd.d+eee.e<CR><LF>
Where a = address, bbb.b = wind speed,
ccc.c = wind direction, ddd.d = temperature, and
eee.e = relative humidity
aR1!
a+ffff.f+gggg.g+hhhh+ii.ii<CR><LF>
Where a = address, ffff.f = barometric pressure,
gggg.g = Rain Option, hhhh = Solar Option, and
ii.ii = Power Supply Voltage
aRC0!
a+bbb.b+ccc.c+ddd.d+eee.e{crc}<CR><LF>
Where a = address, bbb.b = wind speed,
ccc.c = wind direction, ddd.d = temperature,
eee.e = relative humidity, and {crc} = CRC
Continuous Measurements with
CRC
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SDI-12
COMMAND
SENSOR RESPONSE
aRC1!
a+ffff.f+gggg.g+hhhh+ii.ii{crc}<CR><LF>
Where a = address, ffff.f = barometric pressure,
gggg.g = Rain Option, hhhh = Solar Option, and
ii.ii = Power Supply Voltage and {crc} = CRC
Report Wind Units
aXSU!
Set Wind Units aXSUb
aXSUb!
aXSUb!<CR><LF>
Where a = address, and
b = 0 for Meters per Second (default), or
1 for Miles per Hour
Report Temperature Units
aXTU!
Set Temperature Units
aXTUd!
Report Pressure Units
aXPU!
Set Pressure Units
aXPUf!
Report Rain Units
aXRU!
Set Rain Units
aXRUf!
Report Version Number
aXRV!
NAME
AIO 2-9800 Rev A3
aXTUd<CR><LF>
Where a = address, and
d = 0 for Celsius (default), or
1 for Fahrenheit
aXPUf<CR><LF>
Where a = address, and
f = 0 for Millibars (default), or
1 for Inches of Mercury
aXRUf<CR><LF>
Where a = address, and
f = 0 for mm (default), or
1 for Inches
aXVNxx.x<CR><LF>
Where a = address and
xx.x = firmware version
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8.
Appendix B
8.1. Theory of Operation
Wind
The Met One sonic anemometer operates on the principal that the speed of the wind affects the time it
takes for sound to travel from one point to a second point. If the sound is traveling in the direction of the
wind then the transit time is decreased. If the sound is traveling in a direction opposite the wind then the
transit time is increased.
Ambient Temperature
The temperature sensor in the AIO 2 uses a precision Thermistor. This provides highly accurate and
stable temperature readings.
Relative Humidity
The relative humidity sensor is a capacitive polymer sensor which is constructed to provide excellent
resistance to wetting, dust, dirt, oils, and common environmental chemicals.
Barometric Pressure
The barometric pressure sensor is a stable transducer using nano-technology, yielding a linear and
repeatable sensor with low hysteresis.
This piezo-resistive pressure sensor module is mounted on an electronic circuit board within the sensor. A
microcontroller controls the operation of the sensor and the data interface.
The microcontroller polls the pressure sensor module once per second for the barometric pressure and
the ambient temperature. The raw readings are temperature corrected by the microcontroller.
Fluxgate Compass
The internal compass module is low power and compact. It employs a pair of magneto-resistive sensors,
which change with varying magnetic field strengths, to sense the Earth’s magnetic field.
The AIO 2 microprocessor measures the output of the internal compass and then corrects the wind
direction data for the orientation of the sensor. The output of the AIO 2 wind direction is relative to
magnetic North. A user programmable value of Magnetic Declination may optionally be entered through
terminal mode. This enables wind direction output relative to True rather than Magnetic North.
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9.
Warranty / Service
Warranty
Products manufactured by Met One Instruments, Inc. are warranted against defects
and workmanship for a period of one (1) year from the ship date.
Any product found to be defective during the warranty period will, at the option of
Met One Instruments, Inc., be replaced or repaired. In no case shall the liability of
Met One Instruments, Inc. exceed the purchase price of the product.
This warranty may not apply to products that have been subject to misuse,
negligence, accident, acts of nature, or that have been altered or modified other than
by Met One Instruments, Inc. Consumable items such as filters, bearings pumps and
batteries are not covered under this warranty.
Other than the warranty set forth herein, there shall be no other warranties, whether
expressed, implied or statutory, including warranties of fitness of merchantability.
Service
Any product being returned to Met One Instruments, Inc. for service, repair or
calibration, including items sent for warranty repair, must be assigned a return
authorization (RA) number. Please call (541) 471-7111 or send an email to
[email protected] requesting an RA number and shipping instructions.
All returns must be shipped to the factory, freight pre-paid. Met One Instruments, Inc.
will pay the shipping charge to return the product to the end user after repair or
replacement of an item covered by warranty.
All instruments sent to the factory for repair or calibration must be free of
contamination resulting from sampling chemicals, biological matter, or radioactive
materials. Any items received with such contamination will be disposed and the
customer will be billed a disposal fee.
Replacement parts or service/repair work performed by Met One Instruments, Inc.
are warranted against defects in material and workmanship for a period of ninety
(90) days from the date of shipment, under the same conditions as stated above.
REV 2011
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