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Cable wiring

By rmodd99 ·
Where can I get some information on how to understand the color wiring scheme for serial and parallel cabling.How to read those schemes, which color wire is for what pin #, any and all info ? I understand that 1 goes to 1 as it shows in a scheme but 1 to 1 what. For example: I need to put together a serial 9 pin end with an 25 pin parallel end with a specific wiring, I'll use RS232 but what and how do I do that. It's a tranmission cabling scheme from a PC to a automatic table saw.

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Cable wiring

by shiny_topadm In reply to Cable wiring

Hi, unfortunately, you will find that the color-coding in communications cables isn't part of the standard. For example, you can find everything you want to know about RS232 (renamed EIA-232 serial) at this site: "www.camiresearch.com/Data_Com_Basics/RS232_standard.html" in more detail than you probably need. What you really need is a connector description for the saw controller that explains what signals it is looking for. The color of the individual wires is up to you although most assemblers use something logical like "rainbow" order (you remember: ROYGBIV). Some cable suppliers can also give some help, especially if they are going to (custom) build it for you. An example that I've used is "www.blackbox.com", although if you only need one of these cables, it's probably more cost-effective to build it yourself if you have the time, tools, and parts. There are several good reference books out re. data communications, but you really don't need to go that far to build a cable or two. email me if you want suggestions. Good luck with your project, -Will

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Cable wiring

by rmodd99 In reply to Cable wiring

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by McKayTech In reply to Cable wiring

There is really no universally accepted color code for RS-232C. There are four possible connectors (DB9 male or female and DB25 male or female) and two general configurations (null-modem or straight-through)with a few special variations on the control lines.

To translate from the 9-pin to the 25-pin configuration, the pins are as follows:

DB9 DB25 pin name
1 8 DCD
2 2 RxD (receive data)
3 3 TxD (transmit data)
4 20 DTR
5 7 Signal ground
6 6 DSR
7 4 RTS
8 5 CTS
9 22 RI

What I usually do is just make a four-column chart with the pin at end1, pin at end2, color, and pin name and then just connect the pins to the right color as indicated by the chart I've made. Often, a particular connection will only require 3, 4 or 5 of the wires.

Hope this helps you get started.

paul

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Cable wiring

by rmodd99 In reply to Cable wiring

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by rmodd99 In reply to Cable wiring

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