Tema2 RJ45 Serial Cables

8/14/2019 Tema2 RJ45 Serial Cables

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Seminarios-Taller de Informtica Hardware

How to make Cat5/Ethernet (RJ45) and

serial cables

Grado en Ingeniera Informtica

Primer Curso

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Ethernet standards use the same connector: 8P8C (8Position 8 Contact,) usually called RJ45 in the

context of Ethernet over twisted pair.

8P8C - RJ45

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Inside an RJ45 cord


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T-568A and T-568B Straight-

Through Ethernet Cable



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RJ-45 Crossover Ethernet Cable


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Pins Description

Pin Function Pins positions

1 TX+ Transceive data + 2 Transceive data 3 RX+ Receive data + 4 BDD+ Bi-directional data + 5 BDD- Bi-directional data 6 RX- Receive data 7 BDD+ Bi-directional data + 8 BDD- Bi-directional data -

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Assembly and Video

Step by step assembly in pictures

Videohttp://www.youtube.com/watch?

v=0Y5FYcvxP60&feature=related


Serial Cable (Null Modem)

DEFINITION:

It is a cable connected to the serial port, which isresponsible for the communication between twodevices of the same or different nature

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GOAL:

Serial Cable manufacture



Characteristics:

- Transmission and reception lines are crossed in

the connection

- There are several ways of making a null modemconnection, since no standard defines theconnection.

- In order to make such connection no extrahardware is needed, only the cable.



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Serial Cable Manufacture (Null Modem)

We need:

- DB-9 Connector- Cable- Soldering iron with a support

(approx. 25 W.)

- Solder (approx. 0.5 mm.)How to make Cat5/Ethernet (RJ45) and serial cables

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Serial Cable Manufacture (Null Modem)

We cut the necessary cable length

We take off the insulator

We solder the cable and the connector



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Serial Cable Configuration (Null Modem)

PC PIN Signal direction PIN PC

DCD 1 1 DCD

Rx 2 > 2 Rx

DTR 4 >>> 6 DSR

DSR 6 > 8 CTS

CTS 8


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Soldering

What is soldering?:

Soldering is putting together two metals, whichremain phisically and electrically joined.

In order to solder, we need the two parts to puttogether, solder and a soldering iron.


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Requirements for Soldering

Make sure that the surface you will solder is as cleanas possible.

The soldering iron should have no solder or otherkind of remains: a previously moistered sponge is

used.

In order to get a proper joint, soldering must be madeat an adequate temperature.



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Soldering Results

Good soldering:

Bad soldering:


PRECAUTIONS

Avoid burning risks

- Make sure the tip of the soldering iron is properly fixed.

- Dont sake the solder attached to the tip: use the wet sponge.

- Dont forget to unplug the soldering iron when finished.



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PRECAUTIONS

Avoid electrical risks

- Make sure that the equipment is disconnected fromthe power supply.

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Use the appropriate size of the tip of the solderingiron in order to avoid unwanted short circuits.

- Solder on a unidorm and insulating surface.How to make Cat5/Ethernet (RJ45) and serial cables 19

Tema2 RJ45 Serial Cables

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