EFI Bung in head update

About the serial cable. If it works with 9 pin direct plug-in then you need a straight, pin for pin cable. Typically only 3 wires required, pins 2, 3, 5. I build my own.

The best USB to RS232 converters have Prolific, or FTDI chips inside. They seem to work well. There are however Chinese copies.

When a USB converter is plugged in it is assigned a COM port number. Plugging into different port results in new assignment, so it is easy to loose the port in the application configuration. I find it necessary to clear ports since I use a large number of USB serial devices. To find the assigned port look in the device manager of PC. Most applications get hung if USB is plugged in after application starts, or USB connector is wiggled.

I can be of further help in debug, and provide information on loop back testing, with terminal emulator.

I have been using Bluetooth, and happy to say goodbye to USB converters.