Not just RS-232 either. A few years ago I had two band decoders, and
they would work fine on one LPT port but not on the other. Turned out
the questionable port was only delivering 3.3 volts as logic 1, not
quite enough for the band decoder.
73, Pete N4ZR
The World Contest Station Database,
The advantage is that I could possibly pull out the RTS line from my one
RS232 cable
to the computer, and simply add it to the amplifier PTT plug in ACC2. I
would not
have to build a transistor switch to directly trigger the PTT line, which
would have
to be broken out from the custom
We will have voltage/current limiting on this pin, but I was thinking
TTL level RTS. We'll be putting a spec on the port pins.
Wayne
N6KR
On Mar 5, 2012, at 12:58 PM, Oliver Dröse wrote:
The advantage is that I could possibly pull out the RTS line from
my one
RS232 cable
to the
On 3/5/2012 12:58 PM, Oliver Dröse wrote:
you should*NOT* apply RTS directly to the GPIO pin! RS-232 levels go up
into the ±20 volts region per specs
Not in recent recorded history! So-called RS-232 interfaces started
getting cheapened many years ago (before they went away and were
replaced
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