Young Ultrasonic Anemometer Model 81000VRE - Manual (Page 4)

Page 3
81000VRE-90
FOR RS-485 ONLY!
DUPLEX = 2
-----------------------
1) HALF
2) FULL
X) EXIT TO MAIN MENU
6.3 ERROR HANDLING
ERROR HANDLING determines the manner in which invalid mea-
surements are handled. Invalid measurements can occur when
the acoustic path of the sonic signal is blocked or internal circuits
fail. Acoustic blockage may be caused by rain drops, ice, snow, or
other debris on the transducers. When set to INCLUDE INVALID
DATA, an output always occurs. If CUSTOM serial output is used,
an ERROR CODE may be included in the output string to indicate
an error condition. When set to OMIT INVALID DATA, invalid mea-
surements are not output.
ERROR HANDLING: 2
-----------------
1) INCLUDE INVALID DATA
2) OMIT INVALID DATA
X) EXIT
6.4 SCALING MULTIPLIER
SCALING MULT sets overall scaling for UVW, 2D, and 3D wind
speed outputs. Azimuth and elevation angle are not effected. The
default value of 10000 represents a scaling multiplier of 1.0000.
Normally, this value should not be changed since each instrument
is calibrated in the YOUNG factory wind tunnel. Users who wish
to alter the scaling based on independent calibration assessment
may use this parameter to do so.
SCALING MULTIPLIER: 10000
ENTER NEW VALUE:
6.5 OUTPUT RATE
OUTPUT RATE sets the rate at which samples serially output.
Fast output rates and long serial output strings may require higher
baud rates in order to keep up with the outgoing data stream. See
SERIAL COMMUNICATION in SECTION 7 for additional details.
If AVERAGING is used, average results are available only after
enough output samples have been collected. See AVERAGING for
details.
OUTPUT RATE 4Hz
--------------------
A) 4 HZ
B) 5 HZ
C) 8 HZ
D) 10 HZ
E) 16 HZ
F) 20 HZ
G) 32 HZ
X) EXIT TO MAIN MENU
6.6 POLL CHARACTER
POLL CHARACTER (ADDR) sets the address character for polled
operation (POLL CUSTOM or POLLED BINARY output formats).
Any printable ASCII character may be used to assign an address
that uniquely identi es the instrument. When bussed on an RS-485
network with other 81000VRE instruments, each one should have
a different address character.
POLL CHARACTER (ADDR): A
ENTER NEW CHARACTER:
To poll the 81000VRE, send MA! where A is the unique POLL
CHARACTER. The 81000VRE will respond with the POLL CHAR-
ACTER and a space followed by the serial output string.
6.7 SERIAL OUTPUT FORMAT
SERIAL OUTPUT FORMAT sets the output string for serial output.
Preset and custom formats are available.
SERIAL OUTPUT FORMAT 1
------------------------------------
1) CUSTOM
3) NMEA (CHANGES OTHER PARAMETERS, SEE MANUAL)
4) POLLED CUSTOM
6) POLLED BINARY
X) EXIT TO MAIN MENU
CUSTOM
CUSTOM format allows the user to construct an ASCII-printable
serial output string. Long strings may require higher BAUD rates
or lower OUTPUT RATES. (See BAUD and OUTPUT RATE.)
Also, see UNITS. When CUSTOM is selected the following mes-
sage and sub-menu appear:
CURRENT SERIAL OUTPUT FORMAT:
789AB [ 3D-SPEED AZIMUTH ELEVATION SOS Ts ]
CONSTRUCT AN OUTPUT FORMAT BY SELECTING FROM THE LIST BELOW.
ELEMENTS MAY BE IN ANY ORDER. REFER TO MANUAL FOR DETAILS.
----------------------------------------------------------
1) VIN1
2) VIN2
3) VIN3
4) VIN4
5) UVW
6) 2D SPEED
7) 3D SPEED
8) AZIMUTH
9) ELEVATION
A) SOS
B) Ts
C) CHKSUM
E) ERR CODE
V) INTERNAL VOLTAGE
ENTER CUSTOM STRING (12 CHARACTERS MAX):
VIN1 to VIN4 are the four voltage input channels. Standard
calibration sets VIN1 and VIN2 to 0-5000 mV full scale, VIN3
and VIN4 to 0-1000 mV full scale. In all cases, the voltage input
measurement is normalized to a 0-4000 unitless scale and this is
the value that will appear in the output string.
UVW is the orthogonal u, v, and w wind velocities. All three values
are output. Typically the 81000VRE is oriented with u-axis aligned
east-west and v-axis aligned north-south. In this orientation, +u
values = wind from the east; +v values = wind from the north.
Wind from below (updraft) = +w. Refer to Appendix B for illustra-
tion.
2D SPEED is wind magnitude in the u-v plane.
3D SPEED is wind magnitude in three dimensional space.
AZIMUTH is the 0.0-359.9° wind direction angle in the u-v plane.
With the 81000VRE junction box facing south, 0.0° = north, 90.0°
= east, 180.0° = south, and 270.0° = west. Refer to Appendix B for
illustration.
ELEVATION is the ±90.0° wind elevation angle relative to the u-v
plane. Values are positive when wind is from below (updraft) and
negative when from above (downdraft). Effective elevation angle
measurements are limited to ±60.0°. Refer to Appendix B for il-
lustration.
SOS is the speed of sound.
Ts is the sonic temperature derived from SOS.
CHKSUM calculates the bitwise exclusive-or of all characters in
the output string starting with the rst character and ending with