LDL TPMS S3P sensor script detailed description

Sensor - data to publish to broker.

Settings - user-configurable settings.

Operating principle

Device configures TCU with provided WUS IDs. Then only listen CAN messages with wheel unit sensor provided data.

Table 1. Sensors and settings description of Main settings

Nr.	Sensor name:	Type	Description
1.	Tire ID	Sensor	Tire ID value. All other parameters are bonded to this ID
2.	Tire pressure	Sensor	Pressure of tire in kPa. Also, see Table 3.
3.	Tire temperature	Sensor	Temperature value in Celsius. Also, see Table 3.
4.	CAN	Settings	Communication port
5.	Sensor operation mode	Sensor	0 – drive 1 – park 2 – test 3 – ship
6.	Battery status	Sensor	0 – correct battery level 1 – low battery level
7.	Device radio error	Sensor	0 – radio working correctly 1 – radio error
8.	Leakage detected	Sensor	0 – no leakage 1 – leakage detected
9.	Sensor presence	Sensor	0 – data received from a sensor 1 – sensor data not received at all or has not been received for more than 10 minutes
10.	Sensor fault	Sensor	0 – no failure 1 – an acquisition failure has occurred
11.	Sensor temperature fault	Sensor	0 – no temperature 1 – high-temperature warning
12.	Tire pressure fault	Sensor	0 – no pressure warning 1 – high-pressure warning
13.	Tire emission cause	Sensor	0 – regular emission 1 – LF command 2 – delta pressure 3 – mode entry

Table 2. Sensors and settings description of Main settings

Nr.	Sensor name:	Type	Description
1.	Wheel unit sensor (WUS) identifier	Settings	ID of WUS unit. Value in hex
2.	Sensor position	Settings	Sensor position. See image 1
3.	Tire nominal pressure	Settings	Nominal pressure value in kPa
4.	Tire pressure warning level	Settings	This value is in percent. A warning will be if current pressure is higher than nominal pressure value + percent from the nominal value
5.	Tire pressure alert level	Settings	This value is in percent. Alert will be if current pressure is higher than nominal pressure value + percent from the nominal value

Figure 1. Truck wheel position

Table 3. Error codes description

Nr.	Error code	Description
1.	1048575	Wrong measurement.
2.	33554431	Pressure is lower than 5.49 kPa or temperature lower than -49 Celsius.
3.	50331647	Pressure is higher than 1400 kPa or temperature higher than 205 Celsius.

Settings recommendation

This preset will register data when a new ID occurs and when pressure is changed for same sensor

Figure 2. Data recording suggestion

Figure 3. Connection between FMS500 XtCAN and TCU