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Table B-1: Campbell Scientific sensor SDI-12 command and response sets

Name

Command

Response

Address query

a<CR><LF>

Change address

aAb!

b<CR><LF>

Start measurement

aM!

aM1!...aM9!

atttn<CR><LF>

Start measurement

and request CRC

aMC!

aMC1!...aMC9!

atttn <CR><LF>

Start concurrent measurement

aC!

aC1!...aC9!

atttnn<CR><LF>

Start concurrent measurement

and request CRC

aCC!

aCC1!...aCC9!

atttnn<CR><LF>

Send data

aD0!...aD9!

a<values><CR><LF> or

a<values><CRC><CR><LF>

Continuous measurement

aR0!...aR9!

a<values><CR><LF>

Continuous measurement

and request CRC

aRC0!...aRC9!

a<values><CRC><CR><LF>

Information on each of these commands is given in the following sections.

B.1.1 Acknowledge active command (a!)

The acknowledge active command (

) is used to test a sensor on the SDI-12 bus. An active

sensor responds with its address.

B.1.2 Send identification command (al!)

Sensor identifiers are requested by issuing command

aI!

. The reply is defined by the sensor

manufacturer but usually includes the sensor address, SDI-12 version, manufacturer’s name, and
sensor model information. Serial number or other sensor specific information may also be
included. Source:

SDI-12: A Serial-Digital Interface Standard for Microprocessor-Based Sensors

(see

References

[p. 1]).

Command:

aI!

Response:

allccccccccmmmmmmvvvxxx...xx<CR><LF>

Where

= sensor address

MetSENS-Series Compact Weather Sensors

Содержание MetSENS Series

Страница 2: ...Precipitation input 9 5 7 Precipitation measurements 9 5 8 Compass 9 6 Installation 10 6 1 Wiring 10 6 1 1 RS 485 wiring 10 6 1 2 SDI 12 wiring 10 6 1 3 RS 232 wiring 11 6 2 Programming 11 6 2 1 Modbu...

Страница 3: ...nd al 26 B 1 3 Start verification command aV 27 B 1 4 Address query command 27 B 1 5 Change address command aAb 27 B 1 6 Start measurement commands aM 28 B 1 7 Start measurement commands with cyclic r...

Страница 4: ...void the warranty and the calibration l The sensor is a precision instrument Please handle it with care l When installing the unit handle with lint free gloves and degrease the unit to reduce the bui...

Страница 5: ...g Short Cut to program the sensor 1 Open Short Cut and click Create New Program 2 Double click the data logger model 3 In the Available Sensors and Devices box type MetSENS or locate the sensor in the...

Страница 6: ...to be wired to the data logger Click OK after wiring the sensor 5 Repeat steps three and four for other sensors 6 In Output Setup type the scan rate meaningful table names and Data Output Storage Int...

Страница 7: ...the program to the data logger if the data logger is connected to the computer 9 If the sensor is connected to the data logger check the output of the sensor in the data display in LoggerNet RTDAQ or...

Страница 8: ...66 Operating temperature range 40 to 70 C Operating voltage 5 to 30 VDC Typical current drain 12 VDC 25 mA continuous high mode 0 7 mA eco power mode 1 hour polled Compliance CE and RoHS compliant Whe...

Страница 9: ...odel Measurements Weight Dimensions MetSENS200 Wind speed Wind direction Compass 0 5 kg 1 1 lb MetSENS300 Air temperature Relative humidity Barometric pressure 0 5 kg 1 1 lb 155mm 7 5mm 38 5mm 44 5mm...

Страница 10: ...ometric pressure Wind speed Wind direction Compass 0 7 kg 1 5 lb 222mm 38 5mm 44 5mm 7 5mm 142mm MetSENS550 Air temperature Relative humidity Barometric pressure Wind speed Wind direction Compass Conn...

Страница 11: ...8 kg 1 8 lb 7 5mm 38 5mm 142mm 44 5mm 261mm 40mm 5 1 Air temperature measurement Measurement range 40 to 70 C Resolution 0 1 C Accuracy 0 3 C 20 C 5 2 Relative humidity measurements Measurement range...

Страница 12: ...input Measurement input type Triggering Range 0 to 1000 mm hr Resolution from 0 01 mm Input to MetSENS550 Contact closure via an M8 male 4 pin connector User supplied 20 m cable or mating female conn...

Страница 13: ...the RS 485 output Refer to the MD485 manual for more information The Modbus address must be unique and may need to be changed if another sensor on the bus has the same address Contact Campbell Scienti...

Страница 14: ...he RS 232 output can be directly read by a CR6 or CR1000X data logger Table 6 3 p 11 Table 6 3 RS 232 pin out wire color function and data logger connection Wire Color Pin out Function Data logger1 co...

Страница 15: ...output Refer to the MD485 manual for information about using the MD485 Refer to www campbellsci com videos meteopv for information about using the MeteoPV A CR6 or CR1000X data logger programmed as a...

Страница 16: ...asurement and then retrieves the measurement from the sensor See SDI 12 measurements p 18 for more information For most data loggers the SDI12Recorder instruction has the following syntax SDI12Recorde...

Страница 17: ...uld also be mounted away from electrical equipment that generate magnetic fields which will affect the electronic compass The sensor has four notches that need to be aligned to the magnetic north A de...

Страница 18: ...t Angle Mounting bracket U bolts and nuts If using the stand mount secure the mounting stand to the pole or crossarm with the plate carriage screws washers lock washers and wing nuts 6 If measuring wi...

Страница 19: ...PEED m s 5 min average wind speed updated every 30 s 40013 2 FLOAT GDIR Direction of wind gust 40015 2 FLOAT GSPEED m s 3 s wind gust updated every 30 s 40017 2 UNIT32 STATUS Sensor status code p 23 T...

Страница 20: ...rometric pressure 40009 2 FLOAT RH Relative humidity 40011 2 FLOAT TEMP C Air temperature 40013 2 FLOAT DEWPOINT C Dewpoint 40015 2 FLOAT VOLT VDC Supply voltage 40017 2 FLOAT AVGDIR 5 min average win...

Страница 21: ...FLOAT VOLT VDC Supply voltage 40017 2 FLOAT AVGDIR 5 min average wind direction updated every 30 s 40019 2 FLOAT AVGSPEED m s 5 min average wind speed updated every 30 s 40021 2 FLOAT GDIR Direction...

Страница 22: ...Wet bulb temperature 1 n a 2 C 3 4 C 5 hPa 6 n a 7 C 8 C 9 kg m2 10 C 2 s aM2 or aMC2 1 Address 0 through 9 2 Relative wind direction 3 Relative wind speed 4 Status 4 digit code see Sensor status cod...

Страница 23: ...age 0000 Status ETX End of String character ASCII value 3 36 Checksum 2 digit Hex Checksum sum figure calculated from the Exclusive OR of the bytes between and not including the STX and ETX characters...

Страница 24: ...ture 008 5 Dewpoint 05 1 Supply voltage 0004 Status ETX End of String character ASCII value 3 36 Checksum 2 digit Hex Checksum sum figure calculated from the Exclusive OR of the bytes between and not...

Страница 25: ...ECIP MM3 BAUD 9600 COMPASSDECL 000 01 POWER 0 NODE Q SENSOR TEMP ON2 PUPMSG STATUS ON OUTFREQ 1Hz UNITS TEMP C2 PUPMSG REPORT ON MSGMODE CONT SENSOR DEWPOINT ON2 PUPMSG UNITS ON ASCTERM CRLF UNITS DEW...

Страница 26: ...ing properly The following table describes these codes Table 7 7 Status sensor code descriptions Code Status Condition 0000 OK No fault conditions detected in measurement period 0001 Wind Measurement...

Страница 27: ...inement NOTE Once the file is edited with CRBasic Editor Short Cut can no longer be used to edit the program 2 To add the Short Cut wiring information into the new CRBasic program open the DEF file lo...

Страница 28: ...iffer Mode videos B 1 SDI 12 command basics SDI 12 commands have three components l Sensor address a a single character and the first character of the command Use the default address of zero 0 unless...

Страница 29: ...on each of these commands is given in the following sections B 1 1 Acknowledge active command a The acknowledge active command a is used to test a sensor on the SDI 12 bus An active sensor responds wi...

Страница 30: ...e returned when one or more subsequent D commands are issued CR LF terminates the response B 1 4 Address query command Command requests an address of the connected sensor The sensor responds to the qu...

Страница 31: ...xt 35 seconds 0 CR LF Within 35 seconds sensor 0 indicates that it has completed the measurement by sending a service request to the data logger 0D0 The data logger immediately issues the first D comm...

Страница 32: ...ata returned and the number of values a sensor returns the data logger may need to issue aD0 up to aD9 to retrieve all data A sensor may return up to 35 characters of data in response to an aD command...

Страница 33: ...ange the SDI 12 address of an SDI 12 sensor The steps shown in Changing an SDI 12 address p 30 are used with most Campbell Scientific data loggers B 2 1 Changing an SDI 12 address This example was don...

Страница 34: ...s Enter In this example the sensor is connected to C3 The response Entering SDI12 Terminal indicates that the sensor is ready to accept SDI 12 commands 10 To query the sensor for its current SDI 12 ad...

Страница 35: ...its address and responds with the new address In the following example the sensor address is changed from 0 to B 12 To exit SDI 12 transparent mode click Close Terminal NOTE The transparent mode for t...

Страница 36: ...ther manufacturer s products that are resold by Campbell Scientific are warranted only to the limits extended by the original manufacturer Refer to www campbellsci com terms warranty for more informat...

Страница 37: ...ion or Repair Reference number contact your CAMPBELL SCIENTIFIC regional office Please write the issued number clearly on the outside of the shipping container and ship as directed For all returns the...

Страница 38: ...rohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers l Use only manufacturer recommended parts materials and tools Utility and Electrical l Y...

Страница 39: ...nfo campbellsci fr www campbellsci fr Germany Location Phone Email Website Bremen Germany 49 0 421 460974 0 info campbellsci de www campbellsci de India Location Phone Email Website New Delhi DL India...

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