Serial Port Complete - Latest Microcontroller projects

Chapter 5

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    )2-  '

To connect a DTE to a DCE with a 9-pin D-sub at each end, the cable con-

nects each wire straight across, pin 1 to pin 1, pin 2 to pin 2, and so on. Con-

necting a 9-pin D-sub to a 25-pin D-sub requires a cable or adapter that routes

the signals correctly (Figure 5-4).



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A gender changer is a adapter that enables two male (pin) connectors or two

female (receptacle) connectors to connect to each other. In an ideal world, every

DTE would use a male connector, and every DCE would use a female connec-

tor. If you happen to have a situation where you need to connect a DTE and

DCE whose connectors have the same gender, an adapter called a gender

Table 5-1: TIA-561 provides this recommended pinout for use with an 8-position

RJ-type connector.

 




1RI

2CD

3DTR

4SG

5RX

6TX

7CTS

8RTS

Figure 5-4: Use this wiring to convert between 9-pin and 25-pin connectors.