Certainly if you need a full implementation with various control leads
you might have to dig out the breakout box and figure it out. But the
volts / no volts idea is still useful for connecting pairs like RTS/CTS
or DSR/DTR. But I'm surprised how many devices don't use the control
leads. Most of the devices I work with don't even use software flow
control.
Ed
On 7/5/2013 10:06 PM, Chris Albertson wrote:
On Fri, Jul 5, 2013 at 7:03 PM, Ed Palmer <[email protected]> wrote:
I always cursed when I tried to figure out how to wire an RS232 cable
until I realized that transmit had a voltage on it while receive was close
to zero volts. So now I just remember that volts on one end connects to no
volts on the other end. Works every time and I don't have to think about
straight or cross-over.
That only works if there are only three wiresand no handshaking. What if
there is DTE/DCE and so on?
But I think in this case it is just a three wire connection but still there
is room for errors like for example is one of them a TTL level and the
other RS-232. Some times you can mix the two, sometimes not.
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