Method for identifying CAN communication pin baud rate of OBD port of commercial vehicle
A CAN communication and baud rate technology, applied in the field of Internet of Vehicles, can solve the problem of unable to judge the pin communication vehicle and other problems
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[0021] The present invention will be further illustrated by the following examples, the purpose of which is only to better understand the research content of the present invention and not to limit the protection scope of the present invention.
[0022] The baud rate is the number of bits per second (bits / second) that can be sent in serial communication. The MCS-51 serial port has different baud rate calculation methods in four operating modes. Among them, the baud rate calculation of mode 0 and mode 2 is very simple; the baud rate selection of mode 1 and mode 3 are the same, so only the working mode 1 is used as an example to illustrate the selection of the baud rate of serial communication.
[0023] When the serial port works in mode 1, its baud rate will be generated by timer / counter 1. Usually, the timer is set to work in mode 2 (automatic addition mode). The baud rate calculation formula in this mode is:
[0024] Baud rate = (1+SMOD)*crystal frequency / (384*(256-TH1))
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