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常用芯片 |
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RS232串口定义 |
| 作者：佚名 来源：不详 点击数： 更新时间：2008年01月29日 |
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RS232串口定义 标准的RS232串口为25针的接口，我们的pc上常用的是9针的串行接口省略了一些引脚: 
设备侧为25针母插: 
Pin | Name | ITU-T | Dir | Description |
|---|
| 1 | GND | 101 | 
| Shield Ground | | 2 | TXD | 103 | 
| Transmit Data | | 3 | RXD | 104 | 
| Receive Data | | 4 | RTS | 105 |
| Request to Send | | 5 | CTS | 106 |
| 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 |
| Select Transmit Channel | | 12 | S.CD | ? |
| Secondary Carrier Detect | | 13 | S.CTS | ? |
| Secondary Clear to Send | | 14 | S.TXD | ? |
| Secondary Transmit Data | | 15 | TCK | 114 |
| Transmission Signal Element Timing | | 16 | S.RXD | ? |
| Secondary Receive Data | | 17 | RCK | 115 |
| Receiver Signal Element Timing | | 18 | LL | 141 |
| Local Loop Control | | 19 | S.RTS | ? |
| Secondary Request to Send | | 20 | DTR | 108 |
| Data Terminal Ready | | 21 | RL | 140 |
| Remote Loop Control | | 22 | RI | 125 |
| Ring Indicator | | 23 | DSR | 111 |
| Data Signal Rate Selector | | 24 | XCK | 113 |
| Transmit Signal Element Timing | | 25 | TI | 142 |
| Test Indicator |
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