Vaisala WS425FG - Manual (Page 46)

User's Guide ______________________________________________________________________
44 ______________________________________________________________________________
WM Command
This command locks the heater function ON. The command format is:
WM CR LF
The sensor response to the WM command indicates the state of the
transducer heaters after execution. In this mode the heater has been
energized by the external command.
The response to this command is the following:
Heater control locked ON CR LF
The command will energize the array heater circuit. The heaters will
remain on until the power supply watch dog circuit disables them (three
seconds later) to prevent damage to the sensor from overheating. The
normal operation is reset by either the WM or WL command, or cycling
sensor power. Note that the watch dog circuit will lock the heaters off if
the command is not undone.
WN Command
This command locks the heater function OFF. The command format is:
WN CR LF
The sensor response to the WN command indicates the state of the
transducer heaters after execution. In this mode the heater has been de-
energized by the external command.
Notes:
1. The WL, WM, or WN commands override the previously
executed heater control command.
2. On sensor power-up and after the WR command, the heater control
function is initialized in the automatic mode (WL).
The response to this command is the following:
Heater control locked off CR LF
The command will cause the sensor to turn all heating control circuits
off, disabling heating. This state will remain until either the WR or WM
command is issued, or the sensor power is cycled.