📄 07-serial.htm
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<title>PC serial port</title>
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<p align="center"><font size="5" color="#0000FF"><strong><u>PC 串行口定义</u></strong></font></p>
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<td width="100%" align="center" height="26" bgcolor="#FFC8AA"><font color="#000080">[ <a target="_self" href="hardware.htm" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware.htm">返回目录</a> ]</font></td>
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<p><font color="#008080">PC/AT 机上的串行口是 9 针公插座，引脚定义为：</font></p>
<p><img src="conn_dsub9m.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/conn_dsub9m.gif" alt="9 PIN D-SUB MALE" WIDTH="83" HEIGHT="65"> </p>
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<th bgcolor="#0000FF"><font color="#FFFF00">Pin</font></th>
<th bgcolor="#0000FF"><font color="#FFFF00">Name</font></th>
<th bgcolor="#0000FF"><font color="#FFFF00">Dir</font></th>
<th bgcolor="#0000FF"><font color="#FFFF00">Description</font></th>
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<td bgcolor="#C8C8FF"><font color="#008080">1</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">CD</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Carrier Detect</font></td>
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<td bgcolor="#C8C8FF"><font color="#008080">2</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">RXD</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Receive Data</font></td>
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<td bgcolor="#C8C8FF"><font color="#008080">3</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">TXD</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Transmit Data</font></td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">4</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">DTR</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Data Terminal Ready</font></td>
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<td bgcolor="#C8C8FF"><font color="#008080">5</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">GND</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrow.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrow.gif" alt="---" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">System Ground</font></td>
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<td bgcolor="#C8C8FF"><font color="#008080">6</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">DSR</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Data Set Ready</font></td>
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<td bgcolor="#C8C8FF"><font color="#008080">7</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">RTS</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Request to Send</font></td>
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<td bgcolor="#C8C8FF"><font color="#008080">8</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">CTS</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Clear to Send</font></td>
</tr>
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<td bgcolor="#C8C8FF"><font color="#008080">9</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">RI</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Ring Indicator</font></td>
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</table>
<p><font color="#008080">PC/XT 机上的串行口是 25 针公插座，引脚定义为：</font></p>
<p><img src="conn_dsub25m.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/conn_dsub25m.gif" alt="25 PIN D-SUB MALE" WIDTH="171" HEIGHT="65"></p>
<table border="1" cellspacing="1">
<tr>
<th bgcolor="#0000FF"><font color="#FFFF00">Pin</font></th>
<th bgcolor="#0000FF"><font color="#FFFF00">Name</font></th>
<th bgcolor="#0000FF"><font color="#FFFF00">Dir</font></th>
<th bgcolor="#0000FF"><font color="#FFFF00">Description</font></th>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">1</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">SHIELD</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Shield Ground</font></td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">2</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">TXD</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Transmit Data</font></td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">3</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">RXD</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Receive Data</font></td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">4</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">RTS</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Request to Send</font></td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">5</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">CTS</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Clear to Send</font></td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">6</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">DSR</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Data Set Ready</font></td>
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<td bgcolor="#C8C8FF"><font color="#008080">7</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">GND</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">System Ground</font></td>
</tr>
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<td bgcolor="#C8C8FF"><font color="#008080">8</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">CD</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Carrier Detect</font></td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">9</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
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<td bgcolor="#C8C8FF"><font color="#008080">10</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">11</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
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<td bgcolor="#C8C8FF"><font color="#008080">12</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
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<td bgcolor="#C8C8FF"><font color="#008080">13</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
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<td bgcolor="#C8C8FF"><font color="#008080">14</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">15</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">16</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">17</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">18</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">19</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">20</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">DTR</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowr.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowr.gif" alt="-->" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Data Terminal Ready</font></td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">21</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">22</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">RI</font></td>
<td bgcolor="#C8C8FF"><font color="#008080"><img src="arrowl.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/arrowl.gif" alt="<--" WIDTH="32" HEIGHT="9"></font></td>
<td bgcolor="#C8C8FF"><font color="#008080">Ring Indicator</font></td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">23</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">24</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
</tr>
<tr>
<td bgcolor="#C8C8FF"><font color="#008080">25</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">n/c</font></td>
<td bgcolor="#C8C8FF"><font color="#008080">-</font></td>
<td bgcolor="#C8C8FF"> </td>
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