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Must have been 1, 2, 3 & 7. A forty year span is a LONG time to maintain an image in one's mind. Connecting terminals to a PDP-11/34; life was simple back then. Old men want a time machine because the past looks better, or at least longer, than the future.
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Yeah ... it's been over 25 years since I last wired RS323, and even that was probably D9 not D25. And I probably cheated and wired via my datascope which had a patch box built in. 
(Life was easier when you could actually see the data with a scope)
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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You're right. You only need 3 wires for duplex communication. Assuming you connected these wires correctly. the next question is what kind of cable are you using. Transmission lines cause reflections and energy loss. At 10 feet, your cable is long enough to be affected by it. If you're using 3 loose wires, that's a problem; try twisting the wires together. Ideally, you want 100 ohm impedance with 24 AWG wire. If you're using a pre-built cable, check the specs. It may be designed for something else. I also suggest you make sure both computers are powered from the same circuit; otherwise, you may have issues with ground loops.
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Serial ports. Oh the pain, the pain.
I have a whole box of serial cables that I have accumulated over 20 years of use. I have male-female, female-female, and male-male straight-through cables, and a null modem cable. This lets me make up whatever is called for. I verify my connection using one or two of these cables, then build a custom cable. If the custom cable doesn't work, I know it's the cable.
You can connect a serial port using only transmit, receive, and ground, but even at 9600 baud, a steady stream of bytes is likely to overrun your PC's receiver buffer. That's why you want to connect RTS and CTS, which do hardware handshaking. You can do software handshaking using XON and XOFF if your USB-serial box understands that and your terminal software understands that.
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No need. The mystery - why did one cable work and the hand made cable didn't - answered by checking the source code. If you ask for handshake, you need to provide the appropriate cabling. Simple brainfart on my part.
Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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A man attacked me at the grocery store with butter, cheese, and milk. How dairy!
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Did you know that most adult cats will not go near other cats if their feet have been damaged in an accident but kittens will?
As part of the weaning process, they become lack-toes intolerant.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Better take em in for a cat scan.
Got my site back up after my time in the woods!
JaxCoder.com
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I'm just waiting for the Lab report.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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You'd get it faster if you didn't Hound them!
Got my site back up after my time in the woods!
JaxCoder.com
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That's a lot of Shih Tzu are talking there!
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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When the vet gets done you need to Setter down and have a talk with her.
Got my site back up after my time in the woods!
JaxCoder.com
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She'll have to Retriever notes first.
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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I heard a rumor that she may have to go to jail so you might have to Sprimger out!
Got my site back up after my time in the woods!
JaxCoder.com
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I'll need an escape boat - I've got a Mastiff you've got the hull?
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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ay Chihuahua, I give!
Got my site back up after my time in the woods!
JaxCoder.com
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I've a feline your telling tails.
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Be glad ya didn't meat yer demise.
The best way to improve Windows is run it on a Mac.
The best way to bring a Mac to its knees is to run Windows on it.
~ my brother Jeff
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... Goodbye Oppy!
Nasa calls time on silent Opportunity Mars rover - BBC News[^]
14 years longer than design spec, drove 45 times as far as expected, found proof of ancient water on Mars.
Big kudos to the designers!
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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If you think about all that could have gone wrong, and didn't, it is truly amazing. 
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And the software as well - it only had a 20MHz processor, and they wouldn't use that in a toaster these days!
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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OriginalGriff wrote: and they it wouldn't use that work in a toaster these days because the so called developers can't program without wasting resources in unneeded crap when they try to do "smart" things !
FTFY
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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In toasters they traditionally use Intel Pentium II, which swallowed no less than 250W at full speed. Even more if you overclock it. In a toaster they don't need to actually work. With the manufacturing processes of the time they produced enough bad processors and excellent heating elements at the same time.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
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