What is the working principle of the right angle OBD2 16pin to J1939 9pin cable?

What is the working principle of the right angle OBD2 16pin  to J1939  9pin cable?

The working principle of the right angle OBD2 to J1939 cable mainly involves protocol conversion and signal transmission, as follows:

Protocol Conversion

OBD2 protocol analysis: OBD2 is a universal protocol standard used for automotive fault diagnosis. The OBD2 interface on one end of the cable is connected to the vehicle's OBD2 diagnostic port, which reads various data signals sent by the vehicle's ECU (electronic control unit) through the OBD2 protocol, including the vehicle's operating status information, fault codes, etc.

J1939 protocol encapsulation: J1939 is a network communication protocol used in commercial vehicles and other fields, with more powerful functions and more complex communication mechanisms. The protocol conversion chip in the cable will encapsulate the parsed OBD2 data in the J1939 protocol format, allowing the data to be transmitted over the J1939 network.

signalling

Electrical signal conversion: The cable needs to convert the electrical signals received by the OBD2 interface into electrical signals suitable for J1939 network transmission. The OBD2 interface typically uses specific voltage, current, and signal encoding methods, while the J1939 network has its own electrical characteristic requirements. The circuit in the cable amplifies, filters, and converts the signal to ensure its stability and accuracy during transmission.

Data transmission and reception: After protocol conversion and electrical signal conversion, the data is transmitted through cables to target devices in the J1939 network, such as remote monitoring units of vehicles or other diagnostic devices that support the J1939 protocol. At the same time, cables can also convert feedback signals or control instructions sent by devices in the J1939 network into OBD2 protocol format in the opposite process, and transmit them back to the vehicle's ECU, achieving bidirectional data communication.

Through the two key processes of protocol conversion and signal transmission, the right angle OBD2 to J1939 cable serves as a bridge between different protocols, enabling devices supporting the OBD2 interface to effectively interact and communicate with vehicle networks using the J1939 protocol.