Datasheet

CAN:
Pin # Signal Name
1 NC
2 CANL
3 GND
4 NC
5 NC
6 GND
7 CANH
8 NC
9 VIN
CANL and CANH are either deferential input, or differential output depending on
the function of the MCP2551 CAN controller (receiving or transmitting data).
Page 12