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Serial (RS232) port interface pinout and signals9

pin #25

pin#AcronymFull nameDirectionMean3

2

TxD

Transmit Data-»

Transmits bytes out of PC2

3

RxD

Receive Data«-

Receives bytes into PC7

4

RTS

Request To Send-»

RTS/CTS flow control8

5

CTS

Clear To Send«-

RTS/CTS flow control6

6

DSR

Data Set Ready«-

I'm ready to communicate4

20

DTR

Data Terminal Ready-»

I'm ready to communicate1

8

DCD

Data Carrier Detect«-

Modem connected to another9

22

RI

Ring Indicator«-

Telephone line ringing5

7

SG

Signal Ground

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13y ago

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Why the same devices using cross over cable?

In order for two devices to communicate the transmit signal wire must be connected to the receive wire. A crossover cable accomplishes this. With a straight through cable you would have a transmit signal connected to a transmit signal, which is similar to two people talking at once (and no one listening). In a network scenario a straight through cable would cause constant collisions.


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A crossover cable is necessary for two similar devices to talk to each other without the use of an intervening network connectivity device because the transmit and receive signals must be crossed between the two devices. This is what a hub or switch would normally do. If a normal, straight through cable were to be used it would connect the transmit signal to the transmit signal on the other device, which is equivalent to two people talking to each other at the same time with no way to listen to what they are saying. With a crossover cable the transmit signal on one end is connected to the receive signal on the other end so the two devices can talk and listen to each other.


What are some general rules to help you determine which type of Ethernet cable (straight-through or crossover) to use to connect different types of network hosts and devices?

When connecting two computers, use cross-over. Cross-over is required to connect the transmit and receive terminals of the two endpoints. When connecting through a router, switch or hub, use straight-through. The router, switch or hub provides the crossover.


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1. This means that transmit and receive pairs are internally swapped to maintain proper signal alignment of the TX and RX wire pairs


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