v8uhd rs232 pin information item 1,2,3（GND，RX，TX） and usb-RS232 pin information ,pin2,pin3，pin5（RX,TX,GND）.
So we need to connect the pin5 to box number 1(GND)，then connect the pin2 to box number 2,pin3 to box number 3;
If it does not work, please change the connection of pin2 and pin3, that is, pin2 to box number 3, pin3 to box number 2
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GTmedia v8uhd rs232 pin information
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GTmedia v8uhd rs232 pin information
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