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Oops. I realize I didn't provide much info in my previous post so I'll try
more explicit.
I've built the entire charger/serial interface unit and was following the
final debug steps but was stopped at the last step of 3.2.2 in the assembly
manual.
The manual says:
Finally, the MAX232’s ability to transmit data to the host computer is
tested. Again
using pin 7 of J9 as a ground reference, measure the voltage at pin 3 of J9.
This is
the MAX232’s serial output. It should read between _9 and _10 volts. Now
temporarily
jumper the _10 volt supply (pin 6 of the MAX232) to pin 10 of the MAX232,
which is
the input side of this output stage. Again measure the voltage at pin 3 of
J9—it should
now read between + 9 and+ 10 volts.
Well, this is where I'm off. I read ~3.5 volts.
I'm using the MAX232ACPE part.
Might there be a defect? I've checked my soldering and things look okay.
Also, when I attempt to download the pcode_hb.s19 I'm not getting anything
to communicate. The green TX led on the serial board is not lighting at all
when I mess around with the wiring. I'm using a standard db25 M to F
rs-232C cable. I've wired up a DB9 to DB25 cable to see if it was my serial
port but when I attach it, the green light goes on and doesn't go off. Data
still doesn't appear to be coming through the serial board.
I'm at a loss as to what might be wrong.
Thanks again!
Jim Munro
<jimmn@xnet.com>
http://www.xnet.com/~jimmn/robotics.htm
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