1. Confirm the transmission mode of control signals according to the display of China Industrial Network: it is necessary to determine the signal transmission mode of multi-line control panel, whether it is hard wire or bus, and it is necessary to wire according to the actual length, and the bus mode can extend the transmission distance by using repeaters.

2. Choose the right repeater: adopt bus mode and choose the right repeater to extend the transmission distance. The repeater can amplify and shape the signal to ensure the stable transmission of the signal, and select the appropriate repeater according to the transmission distance and signal type.