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  <title>TI-89 Link Protocol Guide - Remote Control</title>
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<b>TI-89 Link Protocol Guide</b> - Remote control/command
<center>
<h2>
<hr align="center">Remote control/command</h2>
</center>
The TI-89's remote control ability is "silent," which means that the
calculator
does not need to be put in a special mode. The remote control ability
can
be utilized any time the calculator is ready to accept a keypress. Key
codes : <a href="../ti83+/keys.txt">here</a>.
<p><b><u>Remote command:</u></b>
</p>
<p>The protocol used for sending a remote command is shown below.
<table bgcolor="#ffffff" border="1" cellspacing="0" width="92%">
  <tbody>
    <tr>
      <th bgcolor="#008800" width="7%"><font color="#ffffff">Step</font></th>
      <th colspan="3" bgcolor="#008800"><font color="#ffffff">Direction</font></th>
      <th bgcolor="#008800" width="80%"><font color="#ffffff">Packet</font></th>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <center>1&nbsp;</center>
      </td>
      <td rowspan="2">
      <center><img src="graphics/comp.gif" alt="Computer" align="bottom"
 border="0" height="33" width="30"></center>
      </td>
      <td bgcolor="#ffffff">
      <center><img src="graphics/right.gif" alt="===&gt;" align="bottom"
 border="0" height="13" width="22"></center>
      </td>
      <td rowspan="2" bgcolor="#ffffff">
      <center><img src="graphics/calc.gif" alt="Calculator"
 align="bottom" border="0" height="35" width="60"></center>
      </td>
      <td bgcolor="#ffffff" width="80%">CMD</td>
    </tr>
    <tr>
      <td bgcolor="#ffffff" width="7%">
      <center>2&nbsp;</center>
      </td>
      <td bgcolor="#ffffff">
      <center><img src="graphics/left.gif" alt="&lt;===" align="bottom"
 border="0" height="13" width="22"></center>
      </td>
      <td bgcolor="#ffffff" width="80%">ACK</td>
    </tr>
  </tbody>
</table>
</p>
<p>The scancode of the key is sent in the last two bytes of the
command.
Scancodes are defined in the section B? to B?? of the French TI-89
guidebook
or p. 384 of the US TI-89 guidebook.<br>
<i>Tim: for French GuideBook, I have some photocopies of the scancodes
but at home (so on Saturday !).</i>
</p>
<p><u>Example:</u>
<table border="0" cellspacing="0" width="100%">
  <tbody>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>08 87 31 00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Command: Key &lt;1&gt;</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>98 56 00 00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of command</i></td>
    </tr>
  </tbody>
</table>
</p>
<p>If the calculator is put into the self test menu (&lt;F5&gt; +
&lt;diamond&gt;
+ &lt;(&gt; + &lt;s&gt; from the home screen) then sent back to the
home screen,
then whenever a command result becomes available the calculator will
send
it through the link port as expression data. Each transmission from the
calculator does not include a packet header or checksum but is
terminated
with 0xFF (see below).
</p>
<p><b><u>Remote Control Mode:</u></b>
</p>
<p>The remote control mode can be activated either by pressing
&lt;F5&gt;
+ &lt;DIAMOND&gt; + &lt;(&gt;+&lt;R&gt; or by sending this key sequence
directly
to the calculator via remote commands. In this mode, the calculator can
receive key codes as if they have been typed on the keyboard and send
the
result via the link port.
</p>
<p>To control the calculator, a scancode must be sent trough the link
port
in a command packet. After each scancode is received, the calculator
replies
with an FFh byte. Whenever a command result becomes available, the
calculator
will send it through the link port as expression data, followed by an
FFh
byte.
</p>
<p><u>Example:</u>
<table nosave="" bgcolor="#ffffff" border="0" cellspacing="0"
 width="100%">
  <tbody>
    <tr>
      <td bgcolor="#ccffcc">PC:</td>
      <td bgcolor="#ccffcc" width="50%"><b><tt>08 87 31 00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Command: &lt;1&gt;</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>FF</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of command</i></td>
    </tr>
    <tr nosave="" bgcolor="#99ffcc">
      <td bgcolor="#ccffcc">PC:&nbsp;</td>
      <td nosave="" bgcolor="#ccffcc" width="50%"><b><tt>08 87 2B 00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Command: &lt;+&gt;</i></td>
    </tr>
    <tr nosave="" bgcolor="#ffcccc">
      <td bgcolor="#ffcccc">TI:</td>
      <td nosave="" bgcolor="#ffcccc" width="50%"><b><tt>FF</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of command</i></td>
    </tr>
    <tr nosave="" bgcolor="#99ffcc">
      <td bgcolor="#ccffcc">PC:&nbsp;</td>
      <td nosave="" bgcolor="#ccffcc" width="50%"><b><tt>08 87 41 00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Command: &lt;a&gt;</i></td>
    </tr>
    <tr nosave="" bgcolor="#ffcccc">
      <td bgcolor="#ffcccc">TI:</td>
      <td nosave="" bgcolor="#ffcccc" width="50%"><b><tt>FF</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of command</i></td>
    </tr>
    <tr nosave="" bgcolor="#99ffcc">
      <td bgcolor="#ccffcc">PC:&nbsp;</td>
      <td nosave="" bgcolor="#ccffcc" width="50%"><b><tt>08 87 0D 00</tt></b></td>
      <td bgcolor="#ccffcc" width="50%"><i>Command: &lt;ENTER&gt;</i></td>
    </tr>
    <tr nosave="" bgcolor="#ffcccc">
      <td bgcolor="#ffcccc">TI:</td>
      <td nosave="" bgcolor="#ffcccc" width="50%"><b><tt>FF</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of command</i></td>
    </tr>
    <tr nosave="" bgcolor="#99ffcc">
      <td bgcolor="#ffcccc">&nbsp;</td>
      <td nosave="" bgcolor="#ffcccc" width="50%"><b><tt>41 2B 31 FF</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Reply with result "a+1"</i></td>
    </tr>
  </tbody>
</table>
<br>
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<hr align="center"><i>Site maintained by Romain Li&eacute;vin (<a
 href="mailto:roms@lpg.ticalc.org">roms@lpg.ticalc.org</a>)
and Tim Singer (<a href="mailto:tsinger@gladstone.uoregon.edu">tsinger@gladstone.uoregon.edu</a>)</i>
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