Hi,
FMM640 CAN is mostly used for Heavy Vehicles. If the vehicle supports J1939 Protocol or Manual CAN then you may directly connect it to FMM640 otherwise you need to use External CAN Adapter such as LVCAN200 or ALLCAN300 .
Although for Manual CAN, You need to configure the sensor PGNs in the manual CAN section of the FMM640. If you use the manual CAN, you need to decode the hex bytes which received in Manual CAN AVL IDs in the server according to your sensor CAN parameter mapping document.
Regards,
Patrick