On Thu, 9 Oct 2003 09:05 pm, Mike, VK4DX wrote:
> Hi
>
> can anybody give me the pin layout for CAT interface for FT990
> (9 pin com port on PC to 6 pin CAT connector on the radio)
>
> Thanks. Mike VK4DX
The cat interface cannot directly be connected to the PC RS232 interface. It
must first be converted from a 5V level to the +-12V level required by RS232
using a device such as the Yaesu FIF-232C interface. For those with
reasonable soldering skills, there are many suggested circuit diagrams for
home-made voltage level converters using a MAX232 chip are available on the
Internet.
Cat interface radio side:
1 GND
2 Serial Out
3 Serial In
4 PTT
5 S/PO
6 Not Connected
Note: Cat Interface is not RS232 but 5V signal level
FT990 Manuals can be downloaded from http://mods.dk
Hope this helps,
73,
Berndt (VK5ABN)
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