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  #1  
Old Thu 27 March 2014, 19:16
DocTanner
Just call me: Don Ross
 
Blue Ridge, Texas
United States of America
Cable Length PDMX

I will be relocating my MechMate this year to a new shop.
I have the PDMX 122 breakout board. I prefer to leave the machine in it's current configuration. This will require a 20 foot (7 meter) cable. Will this work Or is the Ethernet Smoothstepper a better option?

Thanks,
DonRoss
AKA DocTanner
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  #2  
Old Fri 28 March 2014, 07:38
Tom Ayres
Just call me: Tom #117
 
Bassett (VA)
United States of America
Depends on how far the drive is...Ha Ha I think Pete is using 20' cables with his PMDX126, so I'd imagine it would be fine.
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  #3  
Old Fri 28 March 2014, 13:33
Robert M
Just call me: Robert
 
Lac-Brome, Qc
Canada
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DonRoss, Iím assuming your referring to the distance from your 122 BOB with a USB SmoothStepper and the computer?
If so, the best I can remember, with that kind of a setup ( BTW, Itís what Iím set up with and my SS is on top of my BOB, and the computer board sits in my controller box, +/- 12in apart !!)Ö.the SS should be best when nearby to the computer board.
The shorter the better.
Search in this forum, itís been covered a few yrs back, likeÖ..+/- 4yr
R
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  #4  
Old Tue 01 April 2014, 17:31
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
I have (2) 20 foot cables on mine. No problem with it. With an ethernet smooth stepper, it would be best to post at warp9 forum.
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  #5  
Old Wed 02 April 2014, 08:16
Robert M
Just call me: Robert
 
Lac-Brome, Qc
Canada
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DonRoss....& Pete

When I wrote " the best I can remember"....this is what I was referring to "see here"
Hope this helps & clears some !!
Later
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  #6  
Old Wed 02 April 2014, 08:57
KenC
Just call me: Ken
 
Klang
Malaysia
From Wikipedia

Cabling
A USB twisted pair, where the "Data +" and "Data −" conductors are twisted together in a double helix. The wires are enclosed in a further layer of shielding.

The data cables for USB 1.x and USB 2.x use a twisted pair to reduce noise and crosstalk. USB 3.0 cables contain twice as many wires as USB 2.x to support SuperSpeed data transmission, and are thus larger in diameter.[60]

The USB 1.1 Standard specifies that a standard cable can have a maximum length of 5 meters with devices operating at Full Speed (12 Mbit/s), and a maximum length of 3 meters with devices operating at Low Speed (1.5 Mbit/s).[61][62]

USB 2.0 provides for a maximum cable length of 5 meters for devices running at Hi Speed (480 Mbit/s). The primary reason for this limit is the maximum allowed round-trip delay of about 1.5 μs. If USB host commands are unanswered by the USB device within the allowed time, the host considers the command lost. When adding USB device response time, delays from the maximum number of hubs added to the delays from connecting cables, the maximum acceptable delay per cable amounts to 26 ns.[63] The USB 2.0 specification requires that cable delay be less than 5.2 ns per meter (192 000 km/s, which is close to the maximum achievable transmission speed for standard copper wire).

The USB 3.0 standard does not directly specify a maximum cable length, requiring only that all cables meet an electrical specification: for copper cabling with AWG 26 wires the maximum practical length is 3 meters (9.8 ft).[64]
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  #7  
Old Wed 02 April 2014, 09:04
IMMark
Just call me: Mark #119
 
Columbus Ohio
United States of America
Quote:
Originally Posted by KenC View Post
From Wikipedia

Cabling
A USB twisted pair, where the "Data +" and "Data −" conductors are twisted together in a double helix. The wires are enclosed in a further layer of shielding.

The data cables for USB 1.x and USB 2.x use a twisted pair to reduce noise and crosstalk. USB 3.0 cables contain twice as many wires as USB 2.x to support SuperSpeed data transmission, and are thus larger in diameter.[60]

The USB 1.1 Standard specifies that a standard cable can have a maximum length of 5 meters with devices operating at Full Speed (12 Mbit/s), and a maximum length of 3 meters with devices operating at Low Speed (1.5 Mbit/s).[61][62]

USB 2.0 provides for a maximum cable length of 5 meters for devices running at Hi Speed (480 Mbit/s). The primary reason for this limit is the maximum allowed round-trip delay of about 1.5 μs. If USB host commands are unanswered by the USB device within the allowed time, the host considers the command lost. When adding USB device response time, delays from the maximum number of hubs added to the delays from connecting cables, the maximum acceptable delay per cable amounts to 26 ns.[63] The USB 2.0 specification requires that cable delay be less than 5.2 ns per meter (192 000 km/s, which is close to the maximum achievable transmission speed for standard copper wire).

The USB 3.0 standard does not directly specify a maximum cable length, requiring only that all cables meet an electrical specification: for copper cabling with AWG 26 wires the maximum practical length is 3 meters (9.8 ft).[64]
Looks like the PMDX-122 connects via 26 pin ribbon cable or DB-25, so I don't know if the USB stats would apply?
Mark
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  #8  
Old Wed 02 April 2014, 09:16
KenC
Just call me: Ken
 
Klang
Malaysia
AFAIK, twisted pair are better then flat ribbon in terms of noise.
Usually, everywhere I go, I read "u can use flat ribbon cable if it is for short connection of less then 2 ft".
AND, its not often you get long exposed ribbon cable come with commercial products.

Last edited by KenC; Wed 02 April 2014 at 09:18..
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  #9  
Old Wed 02 April 2014, 09:46
IMMark
Just call me: Mark #119
 
Columbus Ohio
United States of America
Yes, I think the shielded variety are "better" than the ribbon. The PMDX allows for both, but I was really referring to the DB-25. My understanding is (and this is not my area of expertise, and certainly not as it applies to the MM specifically) that the DB-25 can go to 30' and perhaps longer? Which I thought was almost double of the USB? (Which I don't think you can use with the PMDX-122)?
Again...no expert here for sure
Mark
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  #10  
Old Wed 02 April 2014, 09:58
KenC
Just call me: Ken
 
Klang
Malaysia
For long LPT cable, its best to have IEEE1284 cable.
Non-compliance cable might work if noise is not a problem.
The longest non-compliance cable I use is 8meter length.

Last edited by KenC; Wed 02 April 2014 at 10:04..
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  #11  
Old Wed 02 April 2014, 10:27
IMMark
Just call me: Mark #119
 
Columbus Ohio
United States of America
I am sure you are correct sir...I couldn't disagree even if I wanted to...I have to use a converter program just to take meters to a length I understand
Mark
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  #12  
Old Wed 02 April 2014, 19:24
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
The ones I used are IEEE 1284 shielded cables.
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  #13  
Old Thu 03 April 2014, 16:27
Tom Ayres
Just call me: Tom #117
 
Bassett (VA)
United States of America
Personally I think the 5 m serial cable is the way to go
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  #14  
Old Fri 04 April 2014, 09:26
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
I think Don was referring to a parallel cable for the 122 and going to an Ethernet smoothstepper only if the cable length was too long.
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  #15  
Old Fri 04 April 2014, 09:31
IMMark
Just call me: Mark #119
 
Columbus Ohio
United States of America
That is what I thought too???
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  #16  
Old Fri 04 April 2014, 17:09
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
Quote:
Originally Posted by DocTanner View Post
I will be relocating my MechMate this year to a new shop.
I have the PDMX 122 breakout board. I prefer to leave the machine in it's current configuration. This will require a 20 foot (7 meter) cable. Will this work Or is the Ethernet Smoothstepper a better option?

Thanks,
DonRoss
AKA DocTanner
I took it also as comparing 2 items:

1) a long length parallel cable of 20 feet
or
2) changeover to a cat5 or cat6 cable connected to a smooth stepper.
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  #17  
Old Mon 07 April 2014, 15:54
DocTanner
Just call me: Don Ross
 
Blue Ridge, Texas
United States of America
Thanks guys. I will try the longer cable first. If not I will go with the smoothstepper.
Thanks,
DonRoss
AKA DocTanner
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  #18  
Old Tue 22 April 2014, 16:28
DocTanner
Just call me: Don Ross
 
Blue Ridge, Texas
United States of America
A 25 foot IEEE 1284 shielded cable is what I ended up with.
No Problems so far.

Thanks,
DonRoss
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  #19  
Old Wed 23 April 2014, 05:58
darren salyer
Just call me: Darren #101
 
Wentzville mo
United States of America
Thanks for the update, good to know.
Post some pics of projects when you get the chance.
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