Key considerations for purchasing J1939 to J1708 cables
1. Interface compatibility
Physical interface type: Confirm that the J1939 end is a Type 1 (black) or Type 2 (green) male connector, and the J1708 end needs to match the device interface.
Pin definition: It must comply with the specifications of J1939 and J1708 to avoid signal interruption caused by incorrect pin connections.
2. Protocol conversion capability
Rate compatibility: J1939 is based on CAN bus, J1708 is based on RS-485, and a built-in signal conversion module is required to handle rate differences.
Data packet support: Ensure that the cable supports bidirectional transmission of J1939 diagnostic messages (such as DM1 fault codes) and J1708 basic parameters (such as engine speed).
3. Cable specifications and performance
Parameter item description
High purity copper conductors are preferred as the conductor material to reduce resistance losses and improve signal integrity.
Shielding design with twisted pair cable and aluminum foil/braided shielding layer to reduce electromagnetic interference (EMI) in high interference scenarios such as mines and ports.
The sheath material is made of high temperature resistant PVC or nylon sheath, which is suitable for the complex working conditions of heavy trucks and construction machinery.
4. Environmental adaptability
Protection level: If used outdoors or in humid environments, waterproof injection molding process (such as IP67 rating) cables should be selected to prevent short circuit risks.
Mechanical strength: The outer layer of the cable should have tensile and wear-resistant properties to avoid damage caused by frequent insertion and removal or vehicle vibration.
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