interfacing the serial - 1.htm

软硬件结合

    <td valign=top style='padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal><span lang=EN-US style='font-family:Arial'>4.<o:p></o:p></span></p>
    </td>
    <td width="97%" style='width:97.0%;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal><span lang=EN-US style='font-family:Arial'>An open
    circuit voltage should never exceed 25 volts. (In Reference to GND</span><span
    style='mso-ascii-font-family:Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:
    Arial'>相对于</span><span lang=EN-US style='font-family:Arial'>) </span><span
    style='mso-ascii-font-family:Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:
    Arial'>不能超过</span><span lang=EN-US style='font-family:Arial'>25V<o:p></o:p></span></p>
    </td>
   </tr>
   <tr>
    <td valign=top style='padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal><span lang=EN-US style='font-family:Arial'>5.<o:p></o:p></span></p>
    </td>
    <td width="97%" style='width:97.0%;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal><span lang=EN-US style='font-family:Arial'>A short circuit
    current should not exceed 500mA. The driver should be able to handle this
    without damage. (Take note of this one</span><span style='mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>注意这一点</span><span
    lang=EN-US style='font-family:Arial'>!) </span><span style='mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>短路电流不超过</span><span
    lang=EN-US style='font-family:Arial'>500mA</span><span style='mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>，驱动器在这种情况下应保证不坏</span><span
    lang=EN-US style='font-family:Arial'><o:p></o:p></span></p>
    </td>
   </tr>
  </table>
  </div>
  <p style='margin-left:36.0pt'><span lang=EN-US>Above is no where near a
  complete list of the EIA standard. Line Capacitance</span><span
  style='font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:Arial'>线路电容</span><span
  lang=EN-US>, Maximum Baud Rates</span><span style='font-family:宋体;mso-ascii-font-family:
  Arial;mso-hansi-font-family:Arial'>最大波特率</span><span lang=EN-US> etc </span><span
  style='font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:Arial'>等等</span><span
  lang=EN-US>are also included. For more information please consult</span><span
  style='font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:Arial'>参考</span><span
  lang=EN-US> the EIA RS232-C standard. It is interesting to note however, that
  the RS232C standard specifies a maximum baud rate of 20,000 BPS!, which is
  rather slow by today's standards</span><span style='font-family:宋体;
  mso-ascii-font-family:Arial;mso-hansi-font-family:Arial'>比现在的标准慢得多</span><span
  lang=EN-US>. A new standard, RS-232D has been recently released</span><span
  style='font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:Arial'>新的</span><span
  lang=EN-US>RS-232D</span><span style='font-family:宋体;mso-ascii-font-family:
  Arial;mso-hansi-font-family:Arial'>标准已发布</span><span lang=EN-US>. </span></p>
  <p style='margin-left:36.0pt'><span lang=EN-US>Serial Ports come in two
  &quot;sizes&quot;</span><span style='font-family:宋体;mso-ascii-font-family:
  Arial;mso-hansi-font-family:Arial'>两种</span><span lang=EN-US>, There are the
  D-Type 25 pin connector</span><span style='font-family:宋体;mso-ascii-font-family:
  Arial;mso-hansi-font-family:Arial'>连接器</span><span lang=EN-US> and the D-Type
  9 pin connector both of which are male</span><span style='font-family:宋体;
  mso-ascii-font-family:Arial;mso-hansi-font-family:Arial'>都是针式的</span><span
  lang=EN-US> on the back of the PC, thus you will require a female connector
  on your device. Below is a table of pin connections for the 9 pin and 25 pin
  D-Type connectors. </span></p>
  <p style='margin-left:36.0pt'><a name=2><span lang=EN-US style='font-size:
  13.5pt'>Serial Pinouts (D25 and D9 Connectors)</span></a><span
  style='mso-bookmark:2'><span style='font-size:13.5pt;font-family:宋体;
  mso-ascii-font-family:Arial;mso-hansi-font-family:Arial'>连接器引脚定义</span></span></p>
  <span style='mso-bookmark:2'></span>
  <div class=MsoNormal align=center style='margin-left:36.0pt;text-align:center'><span
  style='mso-bookmark:2'><span lang=EN-US style='font-family:Arial'>
  <hr size=2 width="100%" align=center>
  </span></span></div>
  <span style='mso-bookmark:2'></span>
  <div align=center>
  <table border=0 cellpadding=0 width="71%" style='width:71.14%;mso-cellspacing:
   1.5pt;margin-left:36.0pt;border:outset .75pt;mso-padding-alt:0cm 0cm 0cm 0cm'>
   <tr>
    <td width="11%" style='width:11.98%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><b><span
    lang=EN-US style='font-family:Arial'>D- 25 </span></b><span lang=EN-US
    style='font-family:Arial'><o:p></o:p></span></p>
    </td>
    <td width="14%" style='width:14.3%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><b><span
    lang=EN-US style='font-family:Arial'>D- 9 </span></b><span lang=EN-US
    style='font-family:Arial'><o:p></o:p></span></p>
    </td>
    <td width="17%" style='width:17.92%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><b><span
    lang=EN-US style='font-family:Arial'>Abbreviation</span></b><span
    lang=EN-US style='font-family:Arial'><o:p></o:p></span></p>
    </td>
    <td width="54%" style='width:54.28%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><b><span
    lang=EN-US style='font-family:Arial'>Full Name </span></b><span lang=EN-US
    style='font-family:Arial'><o:p></o:p></span></p>
    </td>
   </tr>
   <tr>
    <td width="11%" style='width:11.98%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 2 <o:p></o:p></span></p>
    </td>
    <td width="14%" style='width:14.3%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 3 <o:p></o:p></span></p>
    </td>
    <td width="17%" style='width:17.92%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>TD <o:p></o:p></span></p>
    </td>
    <td width="54%" style='width:54.28%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Transmit Data </span><span style='mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>发送</span><span
    lang=EN-US style='font-family:Arial'><o:p></o:p></span></p>
    </td>
   </tr>
   <tr>
    <td width="11%" style='width:11.98%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 3 <o:p></o:p></span></p>
    </td>
    <td width="14%" style='width:14.3%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 2 <o:p></o:p></span></p>
    </td>
    <td width="17%" style='width:17.92%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>RD <o:p></o:p></span></p>
    </td>
    <td width="54%" style='width:54.28%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Receive Data </span><span style='mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>接收</span><span
    lang=EN-US style='font-family:Arial'><o:p></o:p></span></p>
    </td>
   </tr>
   <tr>
    <td width="11%" style='width:11.98%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 4 <o:p></o:p></span></p>
    </td>
    <td width="14%" style='width:14.3%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 7 <o:p></o:p></span></p>
    </td>
    <td width="17%" style='width:17.92%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>RTS <o:p></o:p></span></p>
    </td>
    <td width="54%" style='width:54.28%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Request To Send </span><span style='mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>请求发送</span><span
    lang=EN-US style='font-family:Arial'><o:p></o:p></span></p>
    </td>
   </tr>
   <tr>
    <td width="11%" style='width:11.98%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 5 <o:p></o:p></span></p>
    </td>
    <td width="14%" style='width:14.3%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 8 <o:p></o:p></span></p>
    </td>
    <td width="17%" style='width:17.92%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>CTS <o:p></o:p></span></p>
    </td>
    <td width="54%" style='width:54.28%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Clear To Send </span><span style='mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>清除发送</span><span
    lang=EN-US style='font-family:Arial'><o:p></o:p></span></p>
    </td>
   </tr>
   <tr>
    <td width="11%" style='width:11.98%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 6 <o:p></o:p></span></p>
    </td>
    <td width="14%" style='width:14.3%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 6 <o:p></o:p></span></p>
    </td>
    <td width="17%" style='width:17.92%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>DSR <o:p></o:p></span></p>
    </td>
    <td width="54%" style='width:54.28%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Data Set Ready <o:p></o:p></span></p>
    </td>
   </tr>
   <tr>
    <td width="11%" style='width:11.98%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 7 <o:p></o:p></span></p>
    </td>
    <td width="14%" style='width:14.3%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 5 <o:p></o:p></span></p>
    </td>
    <td width="17%" style='width:17.92%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>SG <o:p></o:p></span></p>
    </td>
    <td width="54%" style='width:54.28%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Signal Ground </span><span style='mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>信号地</span><span
    lang=EN-US style='font-family:Arial'><o:p></o:p></span></p>
    </td>
   </tr>
   <tr>
    <td width="11%" style='width:11.98%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
    style='font-family:Arial'>Pin 8 <o:p></o:p></span></p>
    </td>
    <td width="14%" style='width:14.3%;border:inset .75pt;padding:.75pt .75pt .75pt .75pt'>
    <p class=MsoNormal align=center style='text-align:center'><span lang=EN-US