... card charging system. RS485 sharer has multi-channel RS485 signal input, 1 channel RS485 output,Each port’s communication distance surpasses ... 1200 meters• Various ports isolate mutually, the unwanted signal will not affect other channels, especially qualify star connection ... channels RS485 input, 8 channels RS485 input, 1 channel RS485 signal output or multi-channels RS485 output, two-way data ...