Young Ultrasonic Anemometer Marine Model Model 85106 - Manual (Page 7)

Page 4
85106-90
aI! a13 YOUNG 85000 v1.00
aAb! b
a = Sensor address
b = New sensor address
aV! a0004
Retrieve V data with D command.
Response listed next.
aD0! a+sc+fmt+thresh+damp
a = Sensor address
sc = sample count 0-99
fmt = SDI-12 format 0=CONT, 1=STANDBY
thresh = Polar threshold (cm/s)
damp = Damping factor
aX1nn! None. nn = Sample count 00 or 03-31
aX2n! None. n =SDI-12 format 0 = CONT
1 = STANDBY
aX3nnn! None. nnn = Polar threshold 0-999 cm/s
aX4nn! None. nn = Damping factor 0-99
5.4 LOW POWER OPERATION
Average current consumption with default settings is about 150
mA. This configuration uses no power conservation and enables
all features even though they may not be used. Average current
consumption with once-per-second ASCII serial output and typical
power conservation settings is about 30 mA. This is suitable for
many low power applications.
To reduce current consumption further, additional strategies must
be employed. These include disabling unused outputs, using
polled serial operation, increasing the delay between samples, and
limiting the sample count to the minimum optimal number. Faster
baud rates reduce power by limiting transmit duration.
Lowest power consumption is realized with SDI-12 output format.
However, this requires use with an SDI-12 compatible data logger.
With SDI-12, the average current consumption may easily be
reduced to less than 12 mA during measurements and 320 uA in
standby.
6.0 SETTING OUTPUTS AND OPERATING
PARAMETERS
6.1 SETUP WITH YOUNG 2DSETUP PROGRAM
(RECOMMENDED)
The 2DSETUP program supplied with the sensor provides an easy
method for checking and changing operating settings in the model
85000. Simply install the program on a Windows PC. Follow the
instructions to get the current settings from the sensor, change
settings, and send the new settings to the sensor.
6.2 SETUP USING ANOTHER COMMUNICATIONS PROGRAM
If desired, a serial communications program like HyperTerminal
may be used. Parameters are set using simple commands. A
limited number of parameters may also be set using SDI-12
commands.
For serial communication, the sensor and communication program
must be at the same baud rate and the sensor must be properly
connected. The default baud rate is 9600 but may be set to 1200,
4800, or 38400. Either RS-232 or RS-485 full duplex may be used.
Set hardware handshaking to 'NONE' in your communications
program and use 1 start, 8 data, 1 stop bit.
Except for SDI-12 format, the sensor must be in COMMAND
MODE in order to set parameters. COMMAND MODE is activated
by sending three ESC characters (ASCII 27) in quick succession
while the sensor is running. To signify that the sensor is ready to
accept commands, a '>' prompt character will appear.
If the prompt does not appear after receiving three ESC characters,
re-check the wiring and communication program setup. If the
sensor baud rate is unknown, try sending the ESC characters
at each of the four available baud rates (1200, 4800, 9600, and
38400). It is also possible that parameters have been set to
purposefully disable RS-232 or RS-485 connections. If this the
case, the following method must be used.
In order to provide access under all conditions, the sensor always
begins operation at power up with serial communications set to
38400 baud and RS-232 connections enabled. Immediately after
power up, there is a four second time window in which to send the
ESC characters and enter COMMAND MODE.
To use this feature, set a serial communication program (such
as HyperTerminal) to 38400 baud with no handshaking. Apply
power to the sensor (the sensor must be off for about 30 seconds
before power up). The sensor will transmit "***" (three asterisk
characters) immediately after power up. Now send the three ESC
characters. The COMMAND MODE '>' prompt should appear.
6.3 COMMAND OVERVIEW
At the prompt, type '??' to display a list of available commands
and their format. Type 'RPT' to report current settings. (Note that
some values in the list cannot be set by the user.) Commands are
case sensitive and the exact format must be used. For example,
the SET02nn command requires two digits for the serial format
code. If you send SET023 instead of SET0203, the sensor will
reject the command and indicate an error. Terminate all commands
with a carriage return (ASCII 13). In HyperTerminal, do this by
pressing the ENTER key.
When RMYT, NMEA, or SDI-12 serial format is selected, some
parameters are automatically changed. This may change the baud
rate from its current setting. See section 6.4.2 for details on which
parameters are altered.
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)