Section 6 Parameter Settings
64 FT722 & FT742 (RS485) – FF & PM Sensors – User Manual
6.4.7 CU: Set or Query the Continuous Update Setting
$<listenerID>,CU<cont.update>,<interval>*<checksum>
<cr> <lf>
$<listenerID>,CU?*<checksum><cr><lf>
$<talkerID>,CU=<cont.update>,<interval>*<checksum><
cr> <lf>
$aa,CU=c,xxxxx*hh<cr><lf>
Disabled (Factory Default Setting)
interval, in 0.1s increments, between outputs in continuous mode
Example 1
Set the sensor to output readings automatically every 10 seconds. Verify that the command
has been accepted.
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).
$WI,CU=D,00100*40<cr><lf>
Use the CU command to enable or disable the continuous update mode of operation. When
continuous update is enabled, the sensor 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 sensor previously).
When the continuous update mode is enabled, if the sensor is switched-off, when power is
reapplied the sensor will automatically resume outputting readings.
Once the sensor 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
sensor.
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
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