I recently posted a question about using the computer interface found in
the '96 ARRL Handbook. I was having problems reading status back from the
FT900 but I could write commands to it without any problem. The following
from K8YSE fixed the problem and may be useful to others on the list:
> I had a problem with the interface that I built for my FT1000
similar to what you
> are experiencing. I can't remember which direction had the
problem but whichever
> direction it was, the "0" level was not low enough. And so the
> a continuous "1" The solution was to put a resistor from the
lead to ground. Maybe
> it was a 4.7k or so. This pulled the level down a bit and then
the port was able
> to decode.
> When you send the command to query the radio for its status, does
the cat light come
> on as if it is sending data back to you? If it is coming on when
you command the
> radio but not coming on when the data should be coming back,
there is another problem.
> But if the light comes on and you don't get any data back, the
interface or your serial
> port is not happy with the data.
> John Papay firstname.lastname@example.org
VE3KDH also gave me some tips about programming the interface:
>The update command (80h I think, with 2 I think as data gets current
>... and works, returns 16 bytes.
>I cannot get any of the other commands that return info to work.
>that stat with F, like DIM, etc). All others that that control only with
no data back work OK.
Thanks to all who helped. I hope this will help someone building the
Handbook IF. Now I can get started writing code...
Gene Eighmy - WD4MPS