OBD2 Port Pinout Types
There are two major types of OBD2 connectors. Type A connectors have a 12V output voltage and are commonly found in small vehicles such as cars. However, type B connectors are usually found in medium-sized and heavy vehicles. Moreover, they have an output power supply of 24V.
Baud rate is the rate of information transfer in serial communication channels. A rate of 24,000 bauds means the port can transfer up to 24,000 bits per second. Type A connectors have an approximate baud rate of 500,000 bauds, while type B connectors have a maximum baud rate of 250,000.
The higher the baud rate, the shorter the length of the adapter cable. As such, it is not uncommon to find type B connectors with longer cables than type A connectors. Nevertheless, you should note that this is not a reliable method of distinguishing between the two cable types.