... products are a type of multi-channel analog signal, the digital signal, serial ports RS232/485/422 fiber conversion multiplexing ... low power, supports 1 ~ 4 channels the digital TTL signal/contact closure signal, 1 ~ 4 channel analog (voltage/current), 1 ~ ... )mA optionalSupport 1 ~ 4 channel voltage/current analog signal.Voltage signal interface parameters:Accuracy 0.5% (atmospheric temperature)Voltage ...