DNC Computer Cable

[David Perron]

Hello All, I have a question about DNC computer cable. We use CIMCO DNC and I need to re-wire some machine that we moved. We simply cannot afford the CIMCO brand name cable and I was wondering if anyone else would have Belden or Omni cable part # that they use. I found a belden part # 8133 (28 AWG stranded (7x36) TC conductors, datalene insulation, overall Beldfoil (100% coverage) with 3 pairs), but I am not sure. Thank you for your help.

 

-Dave

[Bryan Johnson]

I have always tried to use individually shielded twisted pairs, largest stranded gage available.

But is tests, it seems to perform no better than Cat 5.

 

I do not have a part number.

[calnet42]

We just moved and re-wired 5 machines.

We used Belden #8335 (5 pair, 24 AWG, Shielded)

Some pretty long runs, with no comm. errors.

 

We bought the parts and had an outside company do the actual hookups.

[Steve Biehl - Cimquest Inc]

Dave,

give me a call and I'll see what we can do.

 

quote:

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largest stranded gage available

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heavier the gage the worse off you are. The large wire causes more resistance and will severely effect length you can communicate. A higher gage number is a smaller wire, so the highest gage would be right but not largest gage.

 

The Cimco wire we use is 28 gage.

[Matthew Hajicek - Singularity]

Use whatever shielded cable you want, just make sure the ends are wired right.

[chris m]

Depending on the number of machines you have I would suggest the wireless option over the long term. If you can't pay for good wire then you obviously aren't in a position to spend $1500 or so to get started now but we've elected to go that route here. A couple of extra bucks now on some wire would be cheaper than thumping your machine when you pick up some transmission problem.

[Jmick]

We went wireless 2 years ago and it was awesome. Prior to that Shop Floor Automation was providing us with communication cables. They were inexpensive and reliable @ 118,000 baud.

[generaldisarray]

Digi-key # W404-100-ND

= Carol shielded w/ drain 24awg 4 cond

45c per foot

Fanuc only need 3 wires for RS232 and DNC

If you want the other Digi-Key numbers for the rest of the cable bits I can post them here too.

[generaldisarray]

Here are the rest of the parts.

 

970-25BCA-ND = Metal DB25 shell

970-09BCA-ND = Metal DB9 shell

1125MEA-ND = DB25 solder cup male

1109FEA-ND = DB9 solder cup female

 

Connections

DB9 Computer

Red-5

Wht-2

Blk-3

Jumper 1-4-6

Jumper 7-8

 

DB25 Fanuc RS232

Red-7

Wht-2

Blk-3

Jumper 4-5

Jumper 6-8-20

Shield Drain gets soldered to housing of connector on this end only.

[John_Carpenter]

Hi Dave,

 

Rs232 Belden cable # 9932 is typically what we will spec. Generally you want a low capacitance <30pF per foot braided shield with a drain wire. As above . The cable you mention is impressive with 20 pF/ft but sells for a higher price. Belden 9932 is half that price, gives you 7 conductors (incase you have to do RTS/CTS handshaking) and works great. Of course wireless is the ideal way to go.

 

 

John Carpenter

www.WireFreeCNC.com

Somers, CT

[3R!< W3NG3R]

Steve, are you sure about this:

 

quote:

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heavier the gage the worse off you are. The large wire causes more resistance and will severely effect length you can communicate. A higher gage number is a smaller wire, so the highest gage would be right but not largest gage.

---

Because I was told different, and a little research says otherwise too.

 

quote:

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The wire gauge is a logarithmic scale base on the cross sectional area of the wire. Each 3-gauge step in size corresponds to a doubling or halving of the cross sectional area. For example, going from 20 gauge to 17 gauge doubles the cross sectional area (which, by the way, halves the DC resistance).

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Check out the chart on the bottom of this page:

 

resistance chart