... data line that connect PC with SG72 module, the “USB serial port (COM[x])” will disappear, again connect the SG72 module with ... PC, the “USB serial port (COM[x])” will appear again, please don’t forget the ... via RS485, open the HGM6300 test software, according the following setting, select the COM port on HGM6310/6320 is same as “USB Serial Port ...