RS232串行接口引脚界说图

引脚界说

1

GND

101

Shield Ground

2

TXD

103

Receive Data

4

RTS

105

Clear to Send

6

DSR

107

Data Set Ready

7

GND

102

System Ground

8

CD

109

Carrier Detect

9

–

–

RESERVED

10

–

–

RESERVED

11

STF

126

Secondary Carrier Detect

13

S.CTS

?

Secondary Clear to Send

14

S.TXD

?

Transmission Signal Element TIming

16

S.RXD

?

Secondary Receive Data

17

RCK

115

Receiver Signal Element TIming

18

LL

141

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Secondary Request to Send

20

DTR

108

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Remote Loop Control

22

RI

125

Ring Indicator

23

DSR

111

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Transmit Signal Element TIming

25

TI

142

Test Indicator