How to Connect

[usgoel]

I want to Know how to design a cable that could connect a DCE device like modem having RJ-45 connector to DTE device like computer's COM port

 

[Bobg1]

A modem having a RJ-45, Hmmm that doesn't sound right....
You best make sure that what ever the device is it is a rs232 port that you are trying to connect to, because that is what is commonly refered to as a com port on a pc.

 

[ANFPS26]

Is this what you are looking for?

http://www.google.com/search?sourceid=navclient&q=rj-45+to+rs-232+adapter

Jim

 

[daronwilson]

There is actually a standard somewhere for how an 8 pin modular jack pins out when used for RS-232. However, I can't find it right now and it is not always the way devices are pinned out. Terminal servers, cisco switches, and other devices use a modular 8 pin jack for serial connection. Before making a cable, you need to know what pin does what.

My suggestion would be to purchase a DB-9 to Modular adapter, Allen tel makes one, it is a DB-9 with a modular 8 pin jack in the hood. The jack is wired to 8 short pieces of wire each with a pin crimped on it. You simply push the pin into the DB-9 shell for each pin as you want it. It makes it very easy to make the adapter for whatever you need. Then, you can use a straight Cat5 patch cord for your cable between the device and the adapter at your computer and you are set.

Good Luck!

It is only my opinion, based on my experience and education...I am always willing to learn, educate me!
Daron J. Wilson, RCDD
daron.wilson@lhmorris.com