Wt command – Vaisala WS425FG User Manual
Page 56
User's Guide ______________________________________________________________________
54 ______________________________________________________________________________
WT Command
This command requests the short response BIT results and status. The
command format is:
WT CR LF
This command is an abbreviated version of the verbose BIT results and
status command. Field descriptors are omitted and only pass/fail status
and measured value are reported. The command response is packed in
the standard STX – body – CSUM – ETX format. The response is
shown below.
Byte 1:
STX start of text ASCII control character
Byte 2:
W sensor ID
Byte 3:
T command identifier
Byte 4:
P or F for heater voltage pass or fail
Byte 5-8:
XX.X format heater voltage (volts RMS)
Byte 9:
P or F for array heater resistance pass or fail
Byte 10-12:
X.X or XX. (format as required) for array heater
resistance (ohms)
Byte 13:
P or F for pass or fail on heater off voltage
Byte 14-16:
X.X format heater off voltage (volts RMS)
Byte 17:
P or F for pass or fail thermistor temperature
Bytes 18-20:
Thermistor temperature (degrees Celsius)
Byte 21:
P or F for incoming supply voltage pass or fail
Byte 22-25:
XX.X format incoming supply voltage (volts DC)
Byte 26:
P or F for 5 volt supply pass or fail
Bytes 26-29:
X.XX format 5 volt supply voltage (volts DC)
Byte 30:
P or F for 10 volt supply pass or fail
Bytes 31-34:
XX.X format 10 volt supply voltage (volts DC)
Byte 35:
ASCII hyphen character (-)
Bytes 36-40:
XXXXX format bad 1 second reading counter
Byte 41:
P or F for path 0 Signal Quality Index pass or fail
Bytes 42-43:
XX format path 0 Signal Quality Index
Byte 44:
P or F for path 1 Signal Quality Index pass or fail