The CAN bus shield from Seeed Studio has an MCP2515 chipset for the implementation of the CAN V2.0B protocol with a data rate of up to 1 Mbit / s. The communication between the CAN bus (CAN_HIGH, CAN_LOW) and the TTL signals (RX, TX) of the MCP2515 is handled by an MCP2551 CAN transceiver. CAN_H and CAN_L can be clamped directly to the board using the existing connection terminal. Alternatively, it is also possible to use an OBD2 to SubD cable to connect the board directly to your vehicle. This is the improved version 2. Seeed Studio asked its community about version 1 and 1.2 and took many customer requests into account when developing the current shield. This includes, for example, that the DB9 socket has been given a switchable pin assignment. Depending on the position of the slide swit.