sometimes USB serial ports install as virtual port COM5 or COM7.
You need to modify the settings of the com port in windows BEFORE you modify them
in the Wouxun software.
I'm assuming your using XP , other windows versions may vary.
from the [START] button
select [CONTROL PANEL] from the drop down menu
in control panel, double LEFT click the SYSTEM icon
in the resulting pop up window select HARDWARE
in the grey window select DEVICE MANAGER button
now look down the list for "Ports COM and LPT" - if its not there you havent installed the USB to serial driver.
click the "[+]" icon to expand the view (if it is there) - if it isn't, again, you may not have the USB-Serial driver installed
You should see your USB serial port with a COM"n" number against it
if that default number is not compatible with the port numbers in the wouxun software, you can change it.
right click it and select PROPERTIES
the second tab on the popup screen is PORT SETTINGS select it
click the ADVANCED button
in the bottom left corner there is a drop down list of the available COM port numbers - the list also shows you which ones are
currently in use on your system
pick an unused port number that is compatible with the radio software (e.g. com 3 or com 4) and apply the changes
window closure is the reverse of opening !!
you may need to reboot to make the changes binding
if you want to test your serial port stand alone , link pins 2 and 3 together then go into hyperterm and set up a connection
"direct to comN"
if pins 2 & 3 are looped and flow control is set to OFF whatever you type on the keyboard should come out of the hyperterm window
kind of like you're typing into notepad
hope this helps
@allanah - if you get totally stuck I'm not too many miles away.