9针RS-232串口(DB9)
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.
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25针RS-232串口(DB25)
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引脚
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简写
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功能说明
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引脚
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简写
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功能说明
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1
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CD
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载波侦测(Carrier Detect)
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8
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CD
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载波侦测(Carrier Detect)
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2
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RXD
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接收数据(Receive)
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3
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RXD
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接收数据(Receive)
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3
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TXD
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发送数据(Transmit)
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2
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TXD
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发送数据(Transmit)
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4
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DTR
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数据终端准备(Data Terminal Ready) |
20
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DTR
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数据终端准备(Data Terminal Ready) | |
5
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GND
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地线(Ground) |
7
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GND
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地线(Ground) | |
6
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DSR
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数据准备好(Data Set Ready) |
6
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DSR
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数据准备好(Data Set Ready) | |
7
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RTS
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请求发送(Request To Send) |
4
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RTS
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请求发送(Request To Send) | |
8
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CTS
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清除发送(Clear To Send) |
5
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CTS
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清除发送(Clear To Send) | |
9
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RI
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振铃指示(Ring Indicator) |
22
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RI
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振铃指示(Ring Indicator) |