Hi
Jock don`t worry I am sure you will sort the problem out.
I don`t know that radio at all I have an ft857d to get that to work with hrd i have to:-
1. make sure the cat is on and using the cat port at the back of the radio if your using that one (ft857d you can use cat via mic).
2. baud rate set the same as hrd 4800 or 9600 or 38000.
3. from the pull down menus in hrd startup window select radio make then model.
4. select the com port the cat cable is connected to or pick auto.
5. select the speed the cat port is set to or select auto.
6. flow control interface power normally both off.
You may find an answer here :-
http://forums.ham-radio.ch/!-- Block_Parsed Url -->
...............Problems..........
I had a com port not working
usb to com port interface problems with laptops not able to supply enough power.
incompatible usb to com port interfaces cheap ones on ebay.
Cheers
Paul
M0pnn