8
2.
Connect your AC power adapter to SER-4485-SI-M 4-Port RS-485 hub. The red
power LED will light when the hub is receiving power. The SER-4485-SI-M provides
failure warning and protected circuit for 4 independent RS-485 downstream ports.
The failure indication LEDs Err1~ Err4 will light, when any one of the RS-485 ports
has incorrect signals or reversed connection. The user can locate the failed port or
devices connected, according to the failure indication LEDs. Err1 indicates the RS-
485 Bus1, Err2 the RS-485 Bus2, and so on.
The SER-4485-SI-M power input is designed with a diode bridge circuit. You don’t need
to care the input DC power polarity, and you can also use an AC to AC 9V ~ 48V power
adapter for SER-4485-SI-M.
3.
After the SER-4485-SI-M is connected to all external devices, you can start data
communication program to transmit and receive serial data. When the upstream
port of SER-4485-SI-M sends data to downstream ports, the green TxD LED will
illuminate. When the upstream port receives data from downstream ports, the
yellow RxD LED will illuminate.
