Section 6
Parameter Settings
36
FT702LT Flat Front Wind Sensor Manual
6.4.3
CU: Set or Query the Continuous Update Setting
Command
Parameter
CU
Command
Syntax
SET Sensor:
$<listenerID>,CU<cont.update>,<interval>*<checksum>
<cr> <lf>
$aa,CUcxxxxx*hh<cr><lf>
QUERY Sensor:
$<listenerID>,CU?*<checksum><cr><lf>
$aa,CU?*hh<cr><lf>
FT702LT output:
$<talkerID>,CU=<cont.update>,<interval>*<checksum><
cr> <lf>
$aa,CU=c,xxxxx*hh<cr><lf>
Parameters
<continuous update>
E
Enabled
D
Disabled (Factory Default Setting)
<interval>
1 to 59999
interval, in 0.2s increments, between outputs in continuous mode
Examples
Example 1
Set the FT702LT to output readings automatically every 10 seconds. Verify that the
command has been accepted.
Message
Comment
$01,CUE00050*//<cr><lf>
Enable CU mode, rate = 0.1Hz
Example 2
Disable the continuous updating. Verify that the command has been accepted. (Note: This
command must only be sent during the first four seconds after power-up
– for more
information see below).
Message
Comment
$01,CUD*//<cr><lf>
Disable CU mode
$01,CU?*//<cr><lf>
Query CU mode setting
$WI,CU=D,00050*44<cr><lf>
FT702LT response
Description
Use the CU command to enable or disable the continuous update mode of operation. When
continuous update is enabled, the FT702LT will output wind velocity readings at a rate
determined by the <interval> setting.
Each time the continuous update mode is enabled, the required <interval> setting must be
sent (even if this has been sent to the FT702LT previously).
When the continuous update mode is enabled, if the FT702LT is switched-off, when power
is reapplied the FT702LT will automatically resume outputting readings.
Once the FT702LT has been put into continuous update mode then it becomes a talker only
and will not respond to any further commands. To be able to send commands again the
continuous mode must be disabled. To achieve this, the CUD (disable continuous update
mode) command must be sent within the first four seconds of the power being applied to the
FT702LT.
WARNING:
Do not use the continuous update mode if
there are other talkers connected to the data bus.
Only one active talker is allowed on the data bus at
any one time otherwise bus contention will occur
