汽车上的OBD-II接口(母)：
ELM327用到的引脚：
2: SAE-J1850 PWM和SAE-1850 VPW总线(+)
4. 车身接地
5. 信号接地
6. CAN high (ISO 15765-4和SAE-J2284)
7. ISO 9141-2和ISO 14230-4总线的K线
10. SAE-J1850 PWM协议总线(-)
14. CAN low (ISO 15765-4和SAE-J2284)
15. ISO 9141-2和ISO 14230-4总线的L线
16. 蓄电池电压
全部引脚定义：
1. Manufacturer discretion. GM: J2411 GMLAN/SWC/Single-Wire CAN.
2. Bus positive Line of SAE-J1850 PWM and SAE-1850 VPW
3. Ford DCL(+) Argentina, Brazil (pre OBD-II) 1997-2000, USA,
4. Chassis ground
5. Signal ground
6. CAN high (ISO 15765-4 and SAE-J2284)
7. K line of ISO 9141-2 and ISO 14230-4
8. -
9. -
10. Bus negative Line of SAE-J1850 PWM only (not SAE-1850 VPW)
Europe, etc. Chrysler CCD Bus(+)
11. Ford DCL(-) Argentina, Brazil (pre OBD-II) 1997-2000, USA, Europe, etc. Chrysler CCD Bus(-)
12. -
13.
14. CAN low (ISO 15765-4 and SAE-J2284)
15. L line of ISO 9141-2 and ISO 14230-4
16. Battery voltage
