Lantronix FOX3-2G Series, Application Note

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ContiPressureCheck™ System Integration into FOX3-2G/3G/4G Series
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J1939.TIRE_CPC_TTM_ID:00:1835297152,01:1835297152,02:1821695488,03:1818171136,0
4:1825507328,05:1825000448,06:1821695360,07:1821695232
TTM= Truck tire module “Sensor inside the tire”
Table 4 : Supported dynamic entries/variables for sending out values received from ContiPressureCheck™ system
Fig 3 : Example representing a 3-axle truck and a 3-axle trailer
Index
(HEX) Graphical
Position (HEX)
Graphical Position
(Dec)
Tire Location
(HEX)
Tire Location
(Dec)
Sensor ID
00 03 3 00 0 6d646948
01 0b 11 01 1 6c94de3c
02 43 67 10 16 1db1bd52
03 4b 75 11 17 6c94dd4e
04 53 83 20 32 1c649712
05 5b 91 21 33 6cc74bf2
… ... … … … …
1F …. … .. … …
Table 5 : Combination of index with graphical position and tire location and sensor ID received from the
corresponding variables listed in table 3
The feature ATL (Automatic Trailer Learning) of the CPC system enables the CCU (Central Control
Unit) of CPC, which is normally mounted on a truck, to detect a trailer which is hooked to this
truck. That means, if the trailer tires are equipped with TTM, too, the pressure, temperature and
warning information is also received by the CCU on the truck and put on the CAN bus. Data of all
learnt tires are available, when ATL function has finished. Data of some trailer tires might be on the
CAN even before the ATL algorithm terminates. The TTM data of the trailer is sent in the same way
on the proprietary CAN (schedule list 2) like the manually configured TTM. The only difference is
the signal “Graphical Position” (PGN 0xFF04). For all TTM learned by ATL the value is always 0xFF.
On schedule List 1 there is no information about trailer tires detected by ATL, because in SAE J1939
trailers are not considered.