I'd been looking at cheap and dirty between another TTL level device to
the KX3 (I presume the KXPA100 is similar). The KX3 schematic looks as
if the putput may go as high as +12V, but a series resistor and diode
clamp at +5V should protect a TTL equivalent input. I used to know good
values, but it's been a long time since I messed with this. But a 2K2
series resistor, and a Schottky diode clamp should win, but that's just
what leaps to mind, please check your application.
Don has indicated that the significant circuit is an Elecraft
"standard", but I wouldn't mind getting verification that the KXPA100 is
the same.
73, doug
On 19-Jan-14 15:46, Don Wilhelm wrote:
Jean,
I mis-spoke. I do not have the schematic for the KAT500. but the
circuit for the "RS-232" interface used in the XG3 has become sort of
the standard at Elecraft as far as I know. I initially said it went to
+5 volts, but after checking I see it can go to +9 volts. If your
Ardrino TTL compatible sink cannot accept +9 volts without damage, you
should use the RS-232 connection. It will work fine with relatively
short cables (but not the very long cables supported by real RS-232
interfaces).
73,
Don W3FPR
On 1/19/2014 6:14 PM, F4GXG wrote:
OK,
In fact I planned to use a MAX232 because I though that it was necessary
for the kat500.
At the end it seems that the kat500 is TTL compatible, so it should be
easier to connect with an Arduino.
If I am right, a direct connection should be possible, without MAX232.
Anyone to confirm?
73 Jean
73
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