Make sure the “Comm. Port” selection in the software is correct. See Which Comm. Port should be selected in the software GS2000 Monitor (USB type) or Which Comm. Port should be selected in the software GS2000 Monitor (RS232 type) according to your base type.
If “Invalid port number” message or “ErrCode: -2, GS_ERR_PORT_NOT_OPEN” message appears on the window of software GS2000 Monitor
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