A trunk module is a module used to connect two different devices. Using DC24V power supply, the electrical isolation between the bus signal input and output completes the signal isolation transmission of the detector bus, which can enhance the anti-interference ability of the whole system, and has the function of expanding the communication distance of the detector bus.
The relay module is mainly used in the area where the bus is in a relatively strong electromagnetic interference and the bus length exceeds 1000m and the bus communication distance needs to be extended.
No, the trunk module does not have the isolation function. Its role is to forward a signal from one port to another port for data connection between two network devices.