Section 7
Parameter Settings
53
FT742-SM (RS422 & RS485) Sensors
– User Manual
7.4.10 DL: Set or Query the Command Delay Interval
Command
Parameter
DL
Command
Syntax
SET Sensor:
$<listenerID>,DL<delay>*<checksum><cr><lf>
$aa,DLxx*hh<cr><lf>
QUERY Sensor:
$<listenerID>,DL?*<checksum><cr><lf>
$aa,DL?*hh<cr><lf>
Sensor output:
$<talkerID>,DL=<delay>*<checksum><cr><lf>
$aa,DL=xx*hh<cr><lf>
Parameters
<delay>
00 to 20
(delay interval, in 50ms increments) (Factory Default Setting = 01)
Examples
Example 1
Set the command delay interval to 250ms and verify the new setting.
Message
Comment
$01,DL05*//<cr><lf>
Set delay to 250ms
$01,DL?*//<cr><lf>
Query delay setting
$WI,DL=05*02<cr><lf>
Sensor response
Description
Use the DL command to set the delay interval from when the sensor receives a command
to when the command is executed. The DL command is primarily intended for use where a
time delay may be required to allow the RS422/RS485 interface to switch from transmit to
receive mode.
For example, if the delay interval is set to 250ms then the sensor will commence outputting
the wind velocity data between 250-300ms after receiving a WV query command.
If any further commands are sent to the sensor before the delay interval has elapsed they
will be discarded.
