Young Ultrasonic Anemometer Voltage and Serial Output Mo Manuale Utente Scaricare il pdf (Pagina 8)

Page 5

85000-90

Although new parameter values are stored immediately when the

command is issued, they do not take effect until the sensor enters

OPERATE MODE.

COMMAND DESCRIPTION

SET01nn Set OUTPUT MODE

01 Enable voltage output

02 Enable RS-232

04 Enable RS-485 full duplex

08 Enable RS-485 half duplex

16 Enable RS-485 output only

SET02nn Set OUTPUT FORMAT

01 RMYT (default)

02 ASCII

03 ASCII POLLED

04 NMEA

05 SDI-12 CONTINUOUS

06 SDI-12 STANDBY

SET03nn Set BAUD RATE

12 1200

48 4800

96 9600

38 38400

SET04nn Set ASCII WS UNITS

01 MPH

02 KNOTS

03 KMPH

04 M/S

SET05c ASCII character sensor address (0-9, A-Z, a-z)

SET06nnn Wind speed threshold for polar output (cm/s)

SET07nnnnn Wind speed scale (nnnnn/10000)

SET08nnnnn Direction offset (±nnnnn degrees x 10)

SET09nn Damping factor

SET10nnn Output delay (0-999 x 8.192 milliseconds)

SET11nn Direction VOUT (36=0-360, 54=0-540 degrees)

SET12nn Sample count (00=auto or 03-31)

SET13nn ASCII and Vout format (00=polar, 01=UV)

SET14nn Vout Status Code (1=none, 2=0V, 3=FS)

CALnn Force Vout (00=0V, 01=5V)

XX Go to OPERATE MODE

RPT Report parameter settings

?? Help list

6.4 COMMAND DETAILS

6.4.1 SET01nn SET OUTPUT MODE

This parameter independently enables and disables voltage output,

RS-232, and RS-485 connections. For example, to enable voltage

output, RS-232, and RS-485 full duplex, add the code for each one:

01 + 02 + 04 = 07, SET0107. To enable only RS-232: SET0102. If

RS-485 is used, choose only one RS-485 option (04, 08, or 16). See

section 6.3 for codes.

To reduce power consumption, enable only those outputs that are

needed. When SDI-12 format is selected with the SET02nn com-

mand, voltage output, RS-232, and RS-485 connections are disabled

and SDI-12 is enabled.

6.4.2 SET02nn SET OUTPUT FORMAT

This parameter determines the serial output data format. See section

5.0 for operational details. When selecting some formats, parameters

are automatically changed as listed below:

FORMAT ADDITIONAL

CODE PARAMETERS CHANGED

01 RMYT BAUD = 9600

OUTPUT MODE = 07

THRESHOLD = 25 cm/s

OUTPUT DELAY = 01

SAMPLE COUNT = 31

02 ASCII

03 ASCII POLLED None

04 NMEA BAUD = 4800

OUTPUT MODE = 19

THRESHOLD = 25 cm/s

OUTPUT DELAY = 122

SAMPLE COUNT = 31

05 SDI-12 CONT

06 SDI-12 STANDBY 1200 baud

Both SDI-12 settings automatically disable voltage output, RS-232,

and RS-485 connections. With either POLLED ASCII or SDI-12

STANDBY, set the Damping Factor to 0 (see section 6.4.9).

6.4.3 SET03nn SET BAUD RATE

All RS-232 and RS-485 communication use the baud rate set with

this parameter. Power consumption is affected by this setting since

it inuences communication duration.

6.4.4 SET04nn SET ASCII WIND SPEED UNITS

Sets wind speed units for ASCII, ASCII POLLED, and SDI-12 polar

outputs only.

6.4.5 SET05c SET POLL ADDRESS CHARACTER

Sets the sensor address for ASCII POLLED and SDI-12 formats. The

default is '0' (ASCII 48).

6.4.6 SET06nn SET WIND SPEED THRESHOLD

Sets the wind speed threshold for polar outputs (wind speed and

direction) to suppress scattered wind direction indications in calm

air. Winds below the threshold are reported as zero, wind direction

is held at last value when wind speed was above threshold. Set

threshold in centimeters per second (m/s x 100). The default setting

is 25 cm/s (0.25 m/s, 0.56 mph).

6.4.7 SET07nnnnn SET WIND SPEED MULTIPLIER

All wind speed measurements are multiplied by this parameter. The

default value is 10000 for a multiplier of 1.0000. This may be used to

individually calibrate each sensor for improved accuracy.

6.4.8 SET08nnnnn SET WIND DIRECTION OFFSET

Use this parameter to add or subtract a wind direction offset. Value

is degrees x 10 and may be positive or negative. Wind direction is

always re-scaled to a 0-360 range after offset is applied. The default

value is 00000.

6.4.9 SET09nn SET DAMPING FACTOR

Wind measurement outputs are damped using the following formula:

damped

= [(d-1) * S

damped

+ S

sample

] / d

where:

damped

= New or last damped wind speed

sample

= New wind speed speed

d = Damping factor

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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