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5.5.3 Get IP address by AR-801CM (COM Port) connects to PC
At first, PCB diagram as follows and Connect AR-801CM to the HOST of the PCB:
Switch DIP SW-1 to “OFF” position.
Switch DIP SW-2 to “ON” position. (Serial Setup Mode)
Switch Jumper J3, J4 and J5 to RS-485 position.
Make sure that have communication IC Chip in the U3 position.