FT Technologies FT702LT - Page 35

Section 6 Parameter Settings
35 FT702LT Flat Front Wind Sensor Manual
6.4.2 CF: Set or Query the Wind Datum Offset Angle
Command
Parameter
CF
Command
Syntax
SET Sensor:
$<listenerID>,CF<offset>*<checksum><cr><lf>
$aa,CFxxx.x*hh<cr><lf>
QUERY Sensor:
$<listenerID>,CF?*<checksum><cr><lf>
$aa,CF?*hh<cr><lf>
FT702LT output:
$<talkerID>,CF=<mode>,<status>,<offset>,<offset>*
<checksum><cr><lf>
$aa,CF=c,c,xxx.x,xxx.x*hh<cr><lf>
Note: for compatibility with other models in the FT702 range the offset
setting is returned twice.
Parameters
<offset>
000.0 to 359.9
Applying an offset electronically rotates the datum direction of the
FT702LT in a counter clockwise direction (when looking down from
above).
(000.00 is Factory Default Setting)
<mode>
D
Always returns D
<status>
D
Always returns D
Examples
Example 1
The datum direction of the FT702LT is rotated by 5deg to the left with respect to the
sensor’s mounting flat (as per Figure 9).
Message
Comment
$01,CF355.0*//<cr><lf>
Set offset angle to 5deg
$01,CF?*//<cr><lf>
Query parameters
$WI,CF=D,D,355.0,355.0*26<cr><lf>
FT702LT output
Example 2
The datum direction of the FT702LT is rotated 5deg to the right with respect to the sensor’s
mounting flat (as per Figure 9).
Message
Comment
$01,CF005.0*//<cr><lf>
Set offset angle to 5deg
$01,CF?*//<cr><lf>
Query parameters
$WI,CF=D,D,005.0,005.0*26<cr><lf>
FT702LT output
Description
Use the CF command to set the FT702LT wind datum direction offset.
WARNING: Once set, the offset value
is retained within the non-volatile
memory. If the sensor’s location is
changed then the offset value must be
changed to suit the new installation or
set to zero otherwise incorrect wind
direction readings will be obtained.