Omnitracs LLC IVG2 用户手册
80-JE026-1 Rev. J
MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION
52
17 J1939 Packet Detection Problem
The engine must be running for the truck to broadcast/supply vehicle data.
Many pre-2007 trucks do not broadcast J1939 packets. If the Core Data Items and J1587
tests pass, it’s not a problem if the J1939 Packet Detection test fails. This would mean
that the IVG system is getting its vehicle data from the J1587 Data link.
tests pass, it’s not a problem if the J1939 Packet Detection test fails. This would mean
that the IVG system is getting its vehicle data from the J1587 Data link.
The IVG system will auto-detect bus traffic, including J1939 bus traffic (250 kbps and 500
kbps), and automatically select the most reliable source for vehicle data.
kbps), and automatically select the most reliable source for vehicle data.
In order to get J1939 data, a truck’s engine must be supplying the J1939 data, a connection
must be made to the J1939 wires (power I/O cable). Many older trucks/engines do not transmit
J1939 packets.
must be made to the J1939 wires (power I/O cable). Many older trucks/engines do not transmit
J1939 packets.