Have you put a scope on the Nortel's transmit lead? If it happens to be
putting out data you can at least determine the baud rate and whether
it's TTL or RS232 levels. It might put out some kind of startup message
on powerup.
Ed
On 7/6/2013 10:56 AM, Jim Sanford wrote:
All:
This is still not going well.
I have tried 3 different computers, 2 running Win7 and one running
XP. the XP machine successfully controls an Icom radio on the same
port, so I know the port is good. I have tried a new serial cable. I
have tried with and without a null modem.
No matter what I do, Lady Heather reports no serial communications on
comm/x.
/Thanks & 73,
Jim
wb4...@amsat.org
/
/
On 7/6/2013 10:44 AM, Ed Palmer wrote:
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 <ed_pal...@sasktel.net>
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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