A system was built to grasp the operating status of many electric vehicles.In the slave computer there were a battery management system and a motor controller to collect the informations from the battery and the motor.A vehicle management system relized the data communication with other units via a controller area network(CAN) and the data were transfered from CAN to the RS232.The data were transfered by a data transfer unit to the host computer by the general packet radio service(GPRS) technology and by he...