FT Technologies FT702LT - Page 43

Section 6 Parameter Settings
43 FT702LT Flat Front Wind Sensor Manual
6.4.10 HT.1: General Heater Settings
Command
Parameter
HT (enable/ disable)
Command
Syntax
SET Sensor:
$<listenerID>,HT<tsp>*<checksum><cr><lf>
$aa,HTxx*hh<cr><lf>
QUERY Sensor:
$<listenerID>,HT?*<checksum><cr><lf>
$aa,HT?*hh<cr><lf>
FT702LT output:
$<talkerID>,HT=<tsp>,<%>,<temp>*<checksum><cr><lf>
$aa,HT=xx,xx,  xx*hh<cr><lf>
Parameters
<tsp>
00-44
heater control circuit set point temperature (degrees centigrade)
44-55
heater control circuit set point temperature (degrees centigrade) only
available from build version 22 and above
99
disables the heater (factory default setting)
<%>
00-99
read only parameter that returns the % of full scale heater current
limit
0% (heater off) to 99% (heater fully on)
<temp>
-99 to +99
read only parameter that returns the current internal temperature of
the FT702LT, In ⁰C, in range 00 to ±99⁰C
Examples
Example 1
Set the FT702LT set point temperature to 5C. Verify that the command has been accepted.
Message
Comment
$01,HT05*//<cr><lf>
Set heater set point temp
$01,HT?*//<cr><lf>
Query heater setting
$WI,HT=05,00,+24*3B<cr><lf>
FT702LT response
Example 2
Turn off the FT702LT heater. Verify that the command has been accepted.
Message
Comment
$01,HT99*//<cr><lf>
Disable heater
$01,HT?*//<cr><lf>
Query heater setting
$WI,HT=99,00,+24*3E<cr><lf>
FT702LT response
Description
Use the HT command to set the FT702LT heater parameters, including switching the heater
on or off and configuring the heater set point. It is possible to query the sensor’s internal
temperature. It is also possible to query the duty cycle of the heater, which specifies the
percentage of the current being drawn by the heaters.