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  #1  
Old Wed 03 December 2008, 02:53
javeria
Just call me: Irfan #33
 
Bangalore
India
Purchasing a good Parallel port cable

Folks,

for the first time builders - if you intend to buy a ready made PP cable then be aware - chk the resistance between individual pins in between the two ends.

The reason being that - I had bought a ready made PP cable and my router was missing steps (the one with servos) For almost 2 weeks I was not able to trouble shoot the problem.

Finally one of my friends suggested replacing the PP cable to a hand made one.

Resistance on the readymade one was 3 ohm and I made one with a 20 core 0.25mm dia which had a resistance of only 0.03 ohm,

and then voila the machine worked perfect!

SO folks again chk the resistance of the PP cable if you are buying a readymade one.

RGDS
Irfan
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  #2  
Old Wed 03 December 2008, 03:23
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Irfan, did you have a bob, like the PMDX-122, on the end of that cable?

As I understand it, a good bob takes care of cable problems.
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  #3  
Old Wed 03 December 2008, 03:41
javeria
Just call me: Irfan #33
 
Bangalore
India
Yes G' I had the Mini IO from Tom(www.candcnc.com), but if the steps are lost before reaching the BOB then what the BOB can do

so its always better to chk and buy the PP cable.

RGDS
Irfan
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  #4  
Old Wed 03 December 2008, 10:46
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
There are some other things to check when buying a parallel port cable . . . .

Don't get those very thin ones - they might not have 25 core wires inside. A LPT printer cable does not need all the cores, but it may happen to have all the cores.

What we need is a straight through DB25 to Centronics cable for the PMDX, which looks like the old-fashioned printer cable, and which may indeed be an old printer cable if you are lucky.
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