A listing for the command response is given below with representative values.
<CR><LF>
P Heater voltage 22.3 Volts <CR><LF>
P Array heater resistance 4.9 Ohms <CR><LF>
P Heaters off voltage 0.1 Volts <CR><LF>
P Incoming supply voltage 12.2 Volts <CR><LF>
P 5.0 volt supply 5.05 Volts <CR><LF>
P 10 volt supply 10.2 Volts <CR><LF>
- Bad 1 second reading counter 0 <CR><LF>
P Path 0 signal quality index 99 <CR><LF>
P Path 1 signal quality index 99 <CR><LF>
P Path 2 signal quality index 99 <CR><LF>
P Path 3 signal quality index 99 <CR><LF>
P Path 4 signal quality index 99 <CR><LF>
P Path 5 signal quality index 99 <CR><LF>
The test limits for the various tests are as listed below:
• Heater voltage good in range 18.0 to 26.0 V
• Array heater resistance good in range 4.0 to 6.0 Ω
• Heaters
o voltage good if below 0.5 V
• Incoming supply voltage good in range 10.5 to 13.5 V
• 5.0 V supply good in range 4.5 to 5.5 V
• 10 V supply good in range 9.0 to 11.0 V
• Signal Quality Index good above 50
5.21.1.3 WT - Request Short Response BIT Results and Status
The command WT requests the short response built-in test (BIT) results and status. The
command format:
WT CR LF
The response:
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 o voltage
WMT700 User Guide M211095EN-H
138
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