Campbell 61302V Manuale utente

INSTRUCTION MANUAL

61302V

Barometric Pressure Sensor

September 2009

Campbell Scientific (Canada)Corp.

WARRANTY AND ASSISTANCE

This equipment is warranted by CAMPBELL SCIENTIFIC (CANADA) CORP. (“CSC”) to

be free from defects in materials and workmanship under normal use and service for

twelve (12) months from date of shipment unless specified otherwise. ***** Batteries

are not warranted. ***** CSC's obligation under this warranty is limited to repairing or

replacing (at CSC's option) defective products. The customer shall assume all costs of

removing, reinstalling, and shipping defective products to CSC. CSC will return such

products by surface carrier prepaid. This warranty shall not apply to any CSC products

which have been subjected to modification, misuse, neglect, accidents of nature, or

shipping damage. This warranty is in lieu of all other warranties, expressed or implied,

including warranties of merchantability or fitness for a particular purpose. CSC is not

liable for special, indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. To obtain a Return

Merchandise Authorization (RMA), contact CAMPBELL SCIENTIFIC (CANADA) CORP.,

at (780) 454-2505. An RMA number will be issued in order to facilitate Repair Personnel

in identifying an instrument upon arrival. Please write this number clearly on the outside

of the shipping container. Include description of symptoms and all pertinent details.

CAMPBELL SCIENTIFIC (CANADA) CORP. does not accept collect calls.

Non-warranty products returned for repair should be accompanied by a purchase order to

cover repair costs.

61302V Barometric Pressure Sensor

Table of Contents

1. INTRODUCTION..............................................................................2

2. SPECIFICATIONS............................................................................2

3. INSTALLATION................................................................................3

3.1.Mounting...........................................................................................3

3.2. Wiring........................................................................................3

3.2.1. Serial Output Wiring..............................................................4

3.2.2. Analog Output Wiring............................................................4

4. SENSOR OPERATION ....................................................................4

4.1. Serial Output.............................................................................5

4.2. Analog Output...........................................................................6

4.3. Software Commands ................................................................7

5. PROGRAMMING..............................................................................8

5.1. Serial Output Program Example ...............................................9

5.2. Voltage Output Program Example ..........................................11

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Appendix A

Typical Wiring Connections...................................................................13

Appendix B

Software Configuration for Voltage Output.............................................14

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61302V Barometric Pressure Sensor

1. INTRODUCTION

MODEL 61302V Barometric Pressure Sensor is a versatile

electronic barometer featuring high accuracy, low power, wide

operating temperature range, and RS-232 serial data I/O or a

calibrated voltage output.

Low power consumption and wide temperature range make the

61302V ideal for remote applications using battery or solar power.

An accuracy of ±0.3 hPa rms is maintained over the entire

specified operating pressure and temperature range. Full scale

voltage output (2.5V or 5V) may be set to span any portion of the

500 to 1100 hPa operating range. RS-232 serial I/O options

include continuous or polled ASCII text output or NMEA marine

output. The sensor is supplied with the following standard

configuration:

•RS232 serial output (TTL levels)

•Polled mode, 9600 baud ( 8 bit/1 stop bit/no parity)

•Measurement range = 500 to 1100 hPa (10 samples

averaged, Output when polled)

2. SPECIFICATIONS

Pressure: 500 to 1100 hPa standard range

Accuracy: ±0.2 hPa rms at 25°C, ±0.3 hPa rms over

-50 to +60°C (serial output)

Resolution: 0.01 hPa (serial output)

0.15 full scale (Analog output)

Operating Range: -50°C to +60°C (unit must remain dry)

Output Rate: 1.8 Hz (max) to 1 per minute (software

selectable)

Voltage Output: 0 to 5000 mV (standard), optional 0 to 2500

12-bit resolution (1 in 4000)

Selectable pressure range - 500 to 1100

hPa (standard)

Resolution is dependent on selected

pressure range

61302V Barometric Pressure Sensor

Serial Output: Full duplex RS-232 (standard & TTL levels)

1200 to 38400 baud

Continuous ASCII text, polled ASCII text,

NMEA

Supply Voltage: 7 to 30 VDC

2.8 mA with Vout

1.4 uA shutdown (Trig=0V)

7 mA with serial I/O (standard)

Case: Fiber-reinforced thermoplastic

Weight: Net 0.2 lb, Shipping 1 lb

3. INSTALLATION

3.1. Mounting The sensor must be protected from the elements either by being

placed in a weather proof enclosure or indoors. The 61302V has

two mounting holes that are spaced 1” on centre. The screws and

grommets shipped with the sensor will aid in mounting the sensor

inside one of Campbell Scientifics’ white fibreglass enclosures. If

the 61302V is to being installed in an enclosure a QDP HYDRO

VENT should used. Otherwise the included poly tube can be used

to vent the sensor to the outdoors via the enclosure port. Vent

this tube about 1” out the cable entry port and insert one of the

white hydrophobic filters (provided) into the end of the tube.

3.2. Wiring

The recommended measurement method is using the serial

“COM” channels available on a datalogger (CR3000, CR1000,

CR800 series). When necessary the sensor can be reconfigured

to output a voltage signal, which can be measured on the analog

channels of a datalogger. This reconfiguration is addressed in

Section 4.2 and Appendix B.

The recommended power supply for the sensor is the switched

12V channel. This will help conserve station power.

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61302V Barometric Pressure Sensor

3.2.1. Serial Output Wiring

Colour Sensor Designation Datalogger Terminal (CR800/850,

CR1000, CR3000)

White Tx COMn* Rx

Blue Rx COMn* Tx

Green Reference G

Red +PWR SW12V (recommended) or 12V

Black -PWR G

Clear Shield G

*The “n” indicates the COM port number

As shown in the above table, the serial wiring requires a crossover

between the sensor transmit/receive and the datalogger

transmit/receive.

3.2.2. Analog Output Wiring

Colour Sensor

Designation Datalogger Terminal (CR800/850,

CR1000, CR3000, CR23X) Datalogger Terminal

(CR10X, CR510)

White Vout Single Ended Channel Single Ended Channel

Blue Optional Trigger No Connection or SW12V No Connection or

SW12V

Green Reference AG

Red +PWR SW12V or 12V SW12V or 12V

Jumper b/w Ctrl Port &

SW12 CTRL

Black -PWR AG

Clear Shield G

Single ended wiring is the only available analog measurement.

4. SENSOR OPERATION

The 61302V Barometric Pressure sensor offers a variety of serial

and analog configurations, which are discussed in the following

sections. Communication/Output connections are made with the

5-position terminal plug included with the sensor. Changes to the

sensor configuration require changes to jumper and/or software

settings. Access the jumpers by loosening the two screws in the

sensor enclosure and removing the cover. See Appendix A for

wiring details and jumper settings.

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61302V Barometric Pressure Sensor

If changed from the standard configuration to an analog output,

please note that the software Vout Scale parameter must be set to

agree with the hardware Voltage Output Scale jumper (P3) in

order to achieve calibrated output.

4.1. Serial Output

Hardware jumper settings and software parameters determine the

RS-232 serial communication format. The Appendix A Wiring

Diagram shows jumper locations and function.

P1 A/B/C sets output format, baud rate, output rate, and

averaging. The table below summarizes P1 configurations.

P3 A/B sets the RS-232 hardware function. AUTO (AA) enables

RS-232 hardware when valid standard RS-232 signals are present

at RX and TX. When not present, the RS-232 hardware is

disabled to save power. FIXED (AB) enables RS-232 hardware at

all times so it can be used with TTL RS-232 signal levels.

P4 A/B configures the terminal connections for RS-232. Both

jumpers must be in position A for RS-232 serial communication.

Format Description

Continuous ASCII

Text

9600 baud

10 sample average

1.8 Hz output

Polled ASCII Text

(standard)

9600 baud

10 sample average

Output when polled

Marine NMEA

4800 baud 10 sample average

1Hz output

Software Output parameters determined by

software settings

Note that NMEA output is normally specified to work on RS-422

and RS-485 networks. The NMEA output here conforms to the

standard data format but the electrical connection uses RS-232

signal levels.

In POLLED ASCII mode, the unit sends data only after receiving a

poll command. The poll command is Ma! where ‘a’ is the sensor

address value. The standard address is ‘0’ (ASCII 48) for a poll

command of M0! Please see Section 4.3 for details on changing

the polling address. Standard baud rate is 9600 but any of

several available baud rates between 1200 and 38400 may be

used.

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61302V Barometric Pressure Sensor

4.2. Analog Output

If the 61302V is to be used in a voltage output mode it is

recommended that the output range of the sensor be remapped

by changing the output range in the sensor software. This is

important in maintaining the highest level of measurement

accuracy. Hardware jumpers and software parameters determine

voltage output operation. Appendix A shows jumper

configurations, and Appendix B shows steps for software

configuration. The jumper settings are also described below.

Both P4 jumpers must be in position B for voltage output.

Jumper P3 sets the Voltage Output Scale to either 0-5000 mV or

0-2500 mV.

Note - Jumper P3 must agree with the software Vout Scale

parameter in order to achieve calibrated output.

The voltage output scale may be mapped to any part of the 500 to

1100 hPa pressure range using the VOUT HI and VOUT LO

software parameters. The standard setting maps 0 to 5000 mV

with 500 to 1100 hPa.

For example:

hPa = 0.12 * mV + 500

Effective range is 600 hPa, Analog signal resolution is 12

bit (resolution = 600/212)

Therefore the effective resolution is about 0.15 hPa

Better effective resolution may be achieved by mapping the

voltage output to a narrower range of pressure with the VOUT HI

and VOUT LO parameters. In most applications VOUT LO can be

set to 950 hPa and VOUT HI can be set to 1050 hPa (VOUT

Scale set to 0-5000 mV):

hPa = 0.02 * mV + 950

Effective range is 100 hPa, Analog signal resolution is 12

bit (resolution = 100/212)

Effective resolution is about 0.025 hPa

Please see Section 4.3 and Appendix B for details on changing

the VOUT HI and LO parameters.

With jumper P4 configured for voltage output, a special optional

trigger (TRIG) input may be used to control barometer power.

When TRIG=0V, all processes cease and power consumption is

reduced to 1.4uA. When the voltage on TRIG > 1.8V (or left

floating), normal operation resumes with a power up reset. The

TRIG input connection is optional. It is recommended to connect

6

61302V Barometric Pressure Sensor

the TRIG to +PWR or left floating, as the datalogger program will

control the sensor power.

4.3. Software Commands

Software commands sent via serial communication may be used

to set operational parameters. The sensor must be configured for

serial communication and connected to a PC or other compatible

device using a program like HyperTerminal.

New settings are stored in temporary memory and must be

burned to flash with command CMD420 to be retained.

Note that the P1 jumper must be configured for SOFTWARE

format to alter baud rate, sample average count, and output rate

parameters. Although the sensor may receive commands at any

time, measurement output may be caused by sending three ESC

(ASCII 27) characters or CMD300 1. While paused, COMMAND

mode is indicated by a “>” prompt. All commands must be

terminated with a carriage return CR (ASCII 13).

Use “?” to list available commands as shown below.

YOUNG 61300 SERIES BAROMETER V2.03

----------------------------------------

CMD100 n OUTPUT PERIOD (0-60 sec)

CMD105 n AVG SAMPLE COUNT (0-32)

CMD110 n OUTPUT FORMAT (1=ASCII 2=POLLED 3=NMEA

4=RAW 5=DIAG)

CMD120 n MULTIPLIER (10000 = 1.0000)

CMD125 n OFFSET (hPa x 100)

CMD130 n SEA LEVEL CORRECTION (hPa x 100)

CMD140 n VOUT RANGE HI (500-1100)

CMD142 n VOUT RANGE LO (500-1100)

CMD144 n VOUT SCALE (2=2.5V 5=5V)

CMD150 c POLL ADDR CHAR

CMD160 n BAUD RATE (38400,9600,4800,2400,1200)

CMD300 n 1=STOP, 2=RUN

CMD310 n FORCE VOUT (0-5000 FULL SCALE)

CMD400 n 1=RPT TEXT, 2=RPT CODE ONLY

CMD410 GET CAL TABLE

CMD420 STORE SETUP PARAMETERS

CMD100 n sets output period in seconds. When set to zero, the

output rate is about 1.8 per second.

CMD105 n sets the average sample count. Higher sample count

yields more stable readings but will lengthen the startup delay.

7

61302V Barometric Pressure Sensor

CMD110 n sets output format. RAW and DIAG settings are for

factory use only.

CMD120 n sets the output multiplier. 10000 represents 1.0000

CMD125 n sets the output offset in hPa x 100

CMD130 n sets the sea level correction in hPa x 100

=[Punadjust *( Mult / 10000)] + [(Offset /100) + (Correction Sea Lvl

/ 100)]

CMD140 n sets the Vout Pressure Range HI

CMD142 n sets the Vout Pressure Range LO Vout Pressure

Range HI must be greater than Vout Pressure Range LO

CMD144 n sets the Vout Scale. 2 = 0 to 2500 mV. 5 = 0 to 5000

mV. This parameter setting must agree with the physical P3

jumper position to achieve calibrated voltage output.

CMD150 c sets the poll address character. Any ASCII character

from ‘0’ (ASCII 48) to ‘z’ (ASCII 122) may be used.

CMD160 n sets the baud rate. Acceptable values are 38400,

9600, 4800, 2400, and 1200. Note that the baud rate change

occurs immediately after the command is received. Therefore, in

order to continue communicating, the serial communication

program that issued the command must also change to match.

CMD300 n causes the sensor to pause or resume measurement.

1 = Stop, 2 = Run.

CMD400 n causes the sensor to issue a report summarizing

parameter settings.

1 = RPT text

2 = RPT code only

CMD410 retrieves the internal calibration table. This is

for factory use only.

CMD420 burns new parameter settings to flash memory. This

step must take place to retain changes otherwise parameters will

revert to the previous values at the next power up.

5. PROGRAMMING

The 61302V draws upwards of 7mA of power when activated.

Depending on your power supply it may be beneficial to conserve

power. This can be achieved by powering the sensors on and off.

This is done through the switched 12V port on the CR10X,

CR23X, CR800, CR850, CR1000, and CR3000. This is used in

the following program examples.

The default measurement units are Hectopascals (hPa). The

units can be converted by adding programming which makes use

of the following conversions.

8

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