Part number of cable?? ? RS-232(DB-9 or DB-25 on PC?) to radio adapter (native RS-232 port on PC) or using a USB-to-radio adapter cable?
Another way of asking that - does the (un-named make/model) PC have a legit serial port or are you using a USB-serial cable?
If it's a legit PC RS-232 port to radio cable adapter, or otherwise, might or not be simply defective, or the OS does not recognize the PC's Serial port.??
What specific version of Windows ?? 3.1, XP, 7, 8, 10, 11?
What does Windows Device Manager indicate for I/O ports, if any?? ?Associated drivers - Intel, Broadcom, Prolific, or generic 8250/16550 serial I/O chip?
If you've got port conflicts or mis-assigned ports that the Moto software cannot use, there are means to change the COM port assigned in Windows.
If it's a USB-serial-port adapter - you'll need FTDI Windows drivers (specific to your OS) which almost never fail to install.??
Write ups about the 'Prolific' USB-serial deceptions and Windows I/O port issues, and details of Device Manager: ? ?
(I spent many years working with most/all genre of PCs, serial I/O programs, hardware diagnostic s/w for same, Windows and user support issues, wrote a book about PC I/O schemes.)
BlueMax does NOT use the problematic Prolific USB-to-RS232 chip and their non-driver crap.? However if you've had a Prolific device installed prior, it could leave you a mess in Windows to clean up.
The BlueMax owner is a local ham.? Reputable.? Has many various models of radios and software to develop and test with.? Call him.
