db9引腳定義
9針RS-232串口(DB9) |
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25針RS-232串口(DB25) | ||||
引腳 |
簡寫 |
功能說明 |
引腳 |
簡寫 |
功能說明 | |
1 |
CD |
載波偵測(Carrier Detect) |
8 |
CD |
載波偵測(Carrier Detect) | |
2 |
RXD |
接收數(shù)據(jù)(Receive) |
3 |
RXD |
接收數(shù)據(jù)(Receive) | |
3 |
TXD |
發(fā)送數(shù)據(jù)(Transmit) |
2 |
TXD |
發(fā)送數(shù)據(jù)(Transmit) | |
4 |
DTR |
數(shù)據(jù)終端準(zhǔn)備(Data Terminal Ready) |
20 |
DTR |
數(shù)據(jù)終端準(zhǔn)備(Data Terminal Ready) | |
5 |
GND |
地線(Ground) |
7 |
GND |
地線(Ground) | |
6 |
DSR |
數(shù)據(jù)準(zhǔn)備好(Data Set Ready) |
6 |
DSR |
數(shù)據(jù)準(zhǔn)備好(Data Set Ready) | |
7 |
RTS |
請求發(fā)送(Request To Send) |
4 |
RTS |
請求發(fā)送(Request To Send) | |
8 |
CTS |
清除發(fā)送(Clear To Send) |
5 |
CTS |
清除發(fā)送(Clear To Send) | |
9 |
RI |
振鈴指示(Ring Indicator) |
22 |
RI |
振鈴指示(Ring Indicator) |