<< Click to Display Table of Contents >> Navigation: FAQs > Why does this message appear "Error Unable to open serial port"? |
A. This means the COM port settings are not configured correctly
Check the details entered in Option 1 - RS485 Setup
B. Check the COM port driver is installed correctly. Consult the documentation from the manufacturer of the RS485 adaptor for more details.
C. This usually happens when a previously used COM port is no longer available, perhaps a USB-to-Serial adaptor has been unplugged.