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6.8.4 POLL CUSTOM
POLL CUSTOM format allows the 81000 to be polled for an output.
See CUSTOM for details on constructing the output string. Poll by
sending MA! where A is the POLL CHARACTER ADDRESS. Allow
at least 5 milliseconds between each poll command charac-
ter. The 81000 responds with the POLL CHARACTER followed by
the custom serial output string. Up to 32 sonic anemometers may be
networked using the RS-485 connection. By assigning a unique
address to each device, multiple units may run on the same network
and respond individually only when polled.
6.9 THRESHOLD
THRESHOLD sets the wind speed threshold in cm/sec. With UVW
output format, the absolute value of wind magnitudes below thresh-
old are reported as zero. With SPEED AZIMUTH ELEVATION output
format, wind speeds below threshold are reported as zero, azimuth
output is maintained at the last value before the wind went below
threshold, and elevation remains zero until threshold is exceeded.
THRESHOLD (cm/s) :20
ENTER NEW THRESHOLD (cm/s, 0-500) :
6.10 UNITS
UNITS sets wind speed units for CUSTOM serial output. Resolution
associated temperature units are as follows:
cm/s
1 cm/s
m/s
0.01 m/s 0.01 °C
mph
0.1 mph 0.01 °F
km/h
0.1 km/h 0.01 °C
knots
0.1 kn
0.01 °F
UNITS 2
-------------------
1)
cm/s
2)
m/s
3)
mph
4)
km/h
5)
knots
X)
EXIT TO MAIN MENU
6.11 VOLTAGE OUTPUT FORMAT
VOLTAGE OUTPUT FORMAT selects one of two formats for scaled
voltage output on outputs V1, V2, V3, and V4. Format 1 selects U
V W, format 2 selects SPEED AZIMUTH ELEVATION. Output V4 is
SONIC TEMPERATURE. Wind speed scaling may be set by the user.
Azimuth, elevation, and sonic temperture scaling is fixed. Regard-
less of format, full scale output is 0-4000 mV for each channel.
VOLTAGE OUTPUT FORMAT 2
------------------------
1)
U V W TEMP
2)
SPEED AZ ELEV TEMP
X)
EXIT
After selecting the format, a prompt for scaling appears:
VOLTAGE OUTPUT SCALE: 0 TO 40 m/s
ENTER NEW VALUE (10-60) :
In UVW format, ± scaling is always implied. For example, entering a
value of 40 means a -40 to +40 m/s span. Note that for UVW format,
0 wind speed is 2000 mV or mid-scale. In the example above, -40 m/
s = 0 mV and +40 m/s = 4000 mV.
In SPEED AZIMUTH ELEVATION format, the SPEED scale represents
positive wind speed only. The fixed scale for AZIMUTH is 0 to 540º
and ELEVATION is -60° to +60°. An elevation value of 0° = 2000 mV.
For either format, the SONIC TEMPERATURE output scale is 220 K to
320 K = 0 to 4000 mV. When voltage outputs are used, the
SERIAL OUTPUT FORMAT must be set to CUSTOM even
0.01 K
though the serial output is not used.
See the accompanying wiring diagram for voltage output connec-
tion details. Note that when ERROR HANDLING is set to INCLUDE
INVALID DATA, voltage outputs go to full scale (4000 mV) when
invalid data is present.
6.12 WAKE CORRECTIONS
WAKE CORRECTION enables or disables real-time correction algo-
rithms. To compensate for flow distortions in the wake of support
struts and other mechanical features, each 81000 is individually
calibrated in the YOUNG factory wind tunnel (NIST traceble) to
generate a unique correction table which is stored in the unit.
Additional compensating algorithms correct for elevation angle
distortions and crosswind effects on speed of sound.
WAKE CORRECTION: YES
USE WAKE CORRECTION? (Y/N):
7.0 WARRANTY
This product is warranted to be free of defects in materials and
construction for a period of 12 months from date of initial pur-
chase. Liability is limited to repair or replacement of defective item.
A copy of the warranty policy may be obtained from R. M. Young
Company.
8.0 CE COMPLIANCE
This product has been tested and shown to comply with
European CE requirements for the EMC Directive. Note that
shielded cable must be used.
Declaration of Conformity
Standards to which Conformity is Declared:
EN 55022 Group 1 (CISPR 22 class B)
EN 50082-1:1997 using
EN61000-4-2:1995
EN61000-4-3:1995 with ENV50204: 1995
EN61000-4-4:1995
EN61000-4-6:1995
Manufacturer's Name and Address:
R. M. Young Company
Traverse City, MI, 49686, USA
Importer's Name and Address:
See Shipper or Invoice
Type of Equipment:
Meteorological Instruments
Model Number / Year of Manufacture:
81000/2000
I, the undersigned, hereby declare that the equipment
specified conforms to the above Directives and Standards.
Date / Place:
Traverse City, Michigan, USA May 1, 2000
David Poinsett
R & D Manager, R. M. Young Company
4 .
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