noah
/
tibasicc


			
				
					
						
						
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   <meta name="GENERATOR" content="Mozilla/4.7 [en] (X11; I; Linux 2.4.0-test6 i586) [Netscape]">
   <title>TI-89 Link Protocol Guide - Silent Transfers</title>
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<body bgcolor="#FFFFE8">
<b>TI-92 Link Protocol Guide</b> - Silent Variable Transfers 
<center>
<h2>

<hr ALIGN="CENTER">Silent Variable Transfers</h2></center>
"Silent Linking" is a capability that Texas Instruments built into the
TI-83, TI-83+, TI-92, TI-89, TI-92 and TI-92+. It enables the calculator
to transfer data to and from a computer without any special preparation
required on the calculator end. The only drawback to the silent linking
method is that when using this protocol, the calculator will automatically
overwrite any data in a variable that has the same name as one being sent
to it. Any program that incorporates silent linking must check for this;
otherwise data may be lost.
<p>Because silent linking protocols are one-sided (i.e. the user interaction
is solely on the computer), there are three different transfer sequences
required. First a <a href="#dir">directory listing</a> must be downloaded
from the calculator in order to choose the variables to transfer or to
check for duplicate names and out-of-memory conditions. Then, if variables
are to be downloaded, a <a href="#request">variable request</a> action
must be initiated by the computer. Finally, if variables are to be uploaded,
a <a href="#rts">request-to-send</a> action must be sent by the computer.
<h4>
<a NAME="dir"></a>Directory Listing</h4>
A directory listing is a list of all user variables in the calculator's
memory and a number specifying how many bytes of free memory are left.
<br>
On the TI92 calculator, the directory list is done in a single pass (contrary 
to TI89/92+). 
<p>The protocol for requesting a directory listing is shown below. For
information on packet formats, <a href="packet.html">click here</a>.
<table BORDER CELLSPACING=0 WIDTH="92%" BGCOLOR="#FFFFFF" NOSAVE >
<tr>
<th WIDTH="7%" BGCOLOR="#008800"><font color="#FFFFFF">Step</font></th>

<th COLSPAN="3" BGCOLOR="#008800"><font color="#FFFFFF">Direction</font></th>

<th WIDTH="80%" BGCOLOR="#008800"><font color="#FFFFFF">Packet</font></th>
</tr>

<tr NOSAVE>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>1&nbsp;</center>
</td>

<td ROWSPAN="10" NOSAVE>
<center><img SRC="graphics/comp.gif" ALT="Computer" BORDER=0 height=33 width=30 align=BOTTOM></center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td ROWSPAN="10" NOSAVE>
<center><img SRC="graphics/calc.gif" ALT="Calculator" BORDER=0 height=35 width=60 align=BOTTOM></center>
</td>

    <td WIDTH="80%" BGCOLOR="#FFFFFF">REQ with data type=19h (see <a href="packet.html#19h">note 
      under Type ID's</a> for variable header format) and with a particular filter.</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>2&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">ACK</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>3&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">VAR - a variable information packet (see
format below)</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>4&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">ACK</td>
</tr>

<tr>
<td WIDTH="7%">
<center>5&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">CTS</td>
</tr>

<tr>
<td WIDTH="7%">
<center>6&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">ACK</td>
</tr>

<tr>
<td WIDTH="7%">
<center>7&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">DATA - a variable entry (see format below).</td>
</tr>

<tr>
<td WIDTH="7%">
<center>8&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">ACK</td>
</tr>

<tr>
<td WIDTH="7%">
<center>9&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">CONT or EOT - if CONT, then go to step 4.</td>
</tr>

<tr>
<td WIDTH="7%">
<center>10&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">ACK</td>
</tr>
</table>

<p>The request has the following format according to the operation (global
directory list or local directory list):
<table BORDER CELLSPACING=0 WIDTH="92%" >
<tr>
<th WIDTH="7%" BGCOLOR="#DDDDDD">Offset</th>

<th WIDTH="8%" BGCOLOR="#DDDDDD">Length</th>

<th WIDTH="85%" BGCOLOR="#DDDDDD">Description</th>
</tr>

<tr>
<td WIDTH="7%">0</td>

<td WIDTH="8%">4 bytes</td>

    <td WIDTH="85%">Always {00h, 00h, 00h, 00}.</td>
</tr>

<tr>
<td WIDTH="7%">4</td>

<td WIDTH="8%">1 bytes</td>

    <td WIDTH="85%">This byte always has a value of 19h (directory list request).</td>
</tr>

<tr>
<td WIDTH="7%">5</td>

<td WIDTH="8%">1 byte</td>

<td WIDTH="85%">The length, in characters, of the name field. Here, it
is always 0.&nbsp;</td>
</tr>
</table>

<p>The data in the variable information packet has the following format:
<table BORDER CELLSPACING=0 WIDTH="92%" >
  <tr> 
    <th WIDTH="7%" BGCOLOR="#DDDDDD">Offset</th>
    <th WIDTH="8%" BGCOLOR="#DDDDDD">Length</th>
    <th WIDTH="85%" BGCOLOR="#DDDDDD">Description</th>
  </tr>
  <tr> 
    <td WIDTH="7%">0</td>
    <td WIDTH="8%">4 bytes</td>
    <td WIDTH="85%">Unknown.</td>
  </tr>
  <tr> 
    <td WIDTH="7%">4</td>
    <td WIDTH="8%">1 bytes</td>
    <td WIDTH="85%">This byte always has a value of 53h (???).</td>
  </tr>
  <tr> 
    <td WIDTH="7%">5</td>
    <td WIDTH="8%">1 byte</td>
    <td WIDTH="85%">The length, in characters, of the name field. Always 04h.</td>
  </tr>
  <tr> 
    <td WIDTH="7%">6</td>
    <td WIDTH="8%">4 bytes</td>
    <td WIDTH="85%">The name of the current folder. Always "main".&nbsp;</td>
  </tr>
</table>

<p>The var section (data packet) of the transfer is always 18 bytes long
and takes the following format:
<table BORDER CELLSPACING=0 WIDTH="92%" >
<tr>
<th WIDTH="7%" BGCOLOR="#DDDDDD">Offset</th>

<th WIDTH="8%" BGCOLOR="#DDDDDD">Length</th>

<th WIDTH="85%" BGCOLOR="#DDDDDD">Description</th>
</tr>

<tr>
<td WIDTH="7%">0</td>

<td WIDTH="8%">4 bytes</td>

<td WIDTH="85%">These four bytes always have a value of 0.</td>
</tr>

<tr>
<td WIDTH="7%">4</td>

<td WIDTH="8%">8 bytes</td>

<td WIDTH="85%">Variable name padded with NULL chars if necessary.</td>
</tr>

<tr>
<td WIDTH="7%">12</td>

<td WIDTH="8%">1 byte</td>

<td WIDTH="85%">Variable type ID.</td>
</tr>

<tr>
<td WIDTH="7%">13</td>

<td WIDTH="8%">1 byte</td>

    <td WIDTH="85%">Variable attribute: 00h = unlocked, 01h = locked.</td>
</tr>

<tr>
<td WIDTH="7%">14</td>

<td WIDTH="8%">4 bytes</td>

    <td WIDTH="85%">If folders are listed, this field contains the number of variables 
      in this folder. <br>
      If variables are listed, this field contains the length, in bytes, of the 
      variable data for this variable without the extra four bytes at the beginning 
      of the data packet.</td>
</tr>
</table>

<p><u>Example:</u> (to do, my examples are too big !)
<br>&nbsp;
<table BORDER=0 CELLSPACING=0 WIDTH="100%" BGCOLOR="#FFFFFF" NOSAVE >
  <tr> 
    <td BGCOLOR="#CCFFCC">PC:</td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC"><tt><b>09 A2 06 00 </b>00 00 00 00 19 00 
      <b>39 00</b></tt></td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Directory list request</i></td>
  </tr>
  <tr> 
    <td BGCOLOR="#FFCCCC">TI:</td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC"><b><tt>89 56 00 00</tt></b></td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Acknowledgement of request</i></td>
  </tr>
  <tr> 
    <td BGCOLOR="#FFCCCC">&nbsp;</td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC"><tt><b>89 06 0A 00 </b>0E 00 00 00 5304 
      6D 61 69 6E 03 <b>52 02</b></tt></td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Variable header - complete directory 
      starting with "main".</i></td>
  </tr>
  <tr> 
    <td BGCOLOR="#CCFFCC">PC:</td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC"><b><tt>09 56 00 00</tt></b></td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Acknowledgement of header</i></td>
  </tr>
  <tr BGCOLOR="#99FFCC" NOSAVE> 
    <td BGCOLOR="#CCFFCC">&nbsp;</td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC" NOSAVE><b><tt>09 09 FF FF</tt></b></td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Clear to send</i></td>
  </tr>
  <tr> 
    <td BGCOLOR="#FFCCCC">TI:</td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC"><b><tt>89 56 00 00</tt></b></td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Acknowledgement of clear to send</i></td>
  </tr>
  <tr BGCOLOR="#FFCCCC" NOSAVE> 
    <td BGCOLOR="#FFCCCC">&nbsp;</td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC" NOSAVE><tt><b>89 15 12 00</b> 00 00 00 00 
      41 00 00 00 00 00 00 00 03 00 01 00 00 00 <b>66 13</b></tt></td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Variable entry - Unlocked folder "base" 
      with one variable</i></td>
  </tr>
  <tr> 
    <td BGCOLOR="#CCFFCC">PC:</td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC"><b><tt>09 56 00 00</tt></b></td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Acknowledgement of variable entry</i></td>
  </tr>
  <tr> 
    <td bgcolor="#FFCCCC">TI:</td>
    <td width="50%" bgcolor="#FFCCCC"><b><tt>89 78 00 00</tt></b></td>
    <td width="50%" bgcolor="#FFCCCC"><i>Continue</i></td>
  </tr>
  <tr> 
    <td bgcolor="#CCFFCC">PC:</td>
    <td width="50%" bgcolor="#CCFFCC"><b><tt>09 56 00 00</tt></b></td>
    <td width="50%" bgcolor="#CCFFCC"><i>Acknowledgement of header</i></td>
  </tr>
  <tr bgcolor="#99FFCC" nosave> 
    <td bgcolor="#CCFFCC">&nbsp;</td>
    <td width="50%" bgcolor="#CCFFCC" nosave><b><tt>09 09 FF FF</tt></b></td>
    <td width="50%" bgcolor="#CCFFCC"><i>Clear to send</i></td>
  </tr>
  <tr> 
    <td bgcolor="#FFCCCC">TI:</td>
    <td width="50%" bgcolor="#FFCCCC"><b><tt>89 56 00 00</tt></b></td>
    <td width="50%" bgcolor="#FFCCCC"><i>Acknowledgement of clear to send</i></td>
  </tr>
  <tr bgcolor="#FFCCCC" nosave> 
    <td bgcolor="#FFCCCC">&nbsp;</td>
    <td width="50%" bgcolor="#FFCCCC" nosave><tt><b>89 15 12 00</b> 00 00 00 00 
      42 00 00 00 00 00 00 00 03 00 01 00 00 00 <b>66 13</b></tt></td>
    <td width="50%" bgcolor="#FFCCCC"><i>Variable entry - Unlocked folder "base" 
      with one variable</i></td>
  </tr>
  <tr> 
    <td bgcolor="#CCFFCC">PC:</td>
    <td width="50%" bgcolor="#CCFFCC"><b><tt>09 56 00 00</tt></b></td>
    <td width="50%" bgcolor="#CCFFCC"><i>Acknowledgement of variable entry</i></td>
  </tr>
  <tr> 
    <td BGCOLOR="#FFCCCC">TI:</td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC"><b><tt>89 92 00 00</tt></b></td>
    <td WIDTH="50%" BGCOLOR="#FFCCCC"><i>End of transmission - no more variables</i></td>
  </tr>
  <tr> 
    <td BGCOLOR="#CCFFCC">PC:</td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC"><b><tt>09 56 00 00</tt></b></td>
    <td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Acknowledgement of EOT</i></td>
  </tr>
</table>

<h4>
<a NAME="request"></a>Requesting a Variable</h4>
The protocol for requesting and receiving a variable from the calculator
is shown below.
<table BORDER CELLSPACING=0 WIDTH="92%" BGCOLOR="#FFFFFF" NOSAVE >
<tr>
<th WIDTH="7%" BGCOLOR="#008800"><font color="#FFFFFF">Step</font></th>

<th COLSPAN="3" BGCOLOR="#008800"><font color="#FFFFFF">Direction</font></th>

<th WIDTH="80%" BGCOLOR="#008800"><font color="#FFFFFF">Packet</font></th>
</tr>

<tr NOSAVE>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>1&nbsp;</center>
</td>

<td ROWSPAN="10" NOSAVE>
<center><img SRC="graphics/comp.gif" ALT="Computer" BORDER=0 height=33 width=30 align=BOTTOM></center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td ROWSPAN="10" NOSAVE>
<center><img SRC="graphics/calc.gif" ALT="Calculator" BORDER=0 height=35 width=60 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">REQ with expected header including the
folder name, if necessary</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>2&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">ACK (see note below)</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>3&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">VAR (specifing the size without the extra
four bytes) with actual header and no folder name</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>4&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">ACK</td>
</tr>

<tr>
<td WIDTH="7%">
<center>5&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">CTS</td>
</tr>

<tr>
<td WIDTH="7%">
<center>6&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">ACK</td>
</tr>

<tr>
<td WIDTH="7%">
<center>7&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">DATA with an extra four bytes at the beginning of the packet</td>
</tr>

<tr>
<td WIDTH="7%">
<center>8&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">ACK</td>
</tr>

<tr>
<td WIDTH="7%">
<center>9&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">EOT</td>
</tr>

<tr>
<td WIDTH="7%">
<center>10&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">ACK</td>
</tr>
</table>
<i>Note: If the requested variable does not exist, step 2 will be the end
of the transfer.</i>
<p>As with manual transfers, the data section contains the variable data.
For information on variable formats,
<a href="vars.html">click here</a>.
<p><u>Example:</u>
<table BORDER=0 CELLSPACING=0 WIDTH="100%" BGCOLOR="#FFCCCC" NOSAVE >
<tr>
<td BGCOLOR="#CCFFCC">PC:</td>

    <td WIDTH="50%" BGCOLOR="#CCFFCC"><tt><b>09 A2 0C 00 </b>00 00 00 00 00 06 
      6D 61 69 6E 5C 64 <b>93 02</b></tt></td>

    <td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Request Known Variable&nbsp; "d" in the 
      "main&quot; folder</i></td>
</tr>

<tr>
<td BGCOLOR="#FFCCCC">TI:</td>

    <td WIDTH="50%" BGCOLOR="#FFCCCC"><b><tt>89 56 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Acknowledgement of request</i></td>
</tr>

<tr>
<td BGCOLOR="#FFCCCC">&nbsp;</td>

    <td WIDTH="50%" BGCOLOR="#FFCCCC"><tt><b>89 06 08 00 </b>05 00 00 00 00 01 
      64 <b>6A 00</b></tt></td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Variable Header: String "d"</i></td>
</tr>

<tr>
<td BGCOLOR="#CCFFCC">PC:</td>

    <td WIDTH="50%" BGCOLOR="#CCFFCC"><b><tt>09 56 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Acknowledgement of variable header</i></td>
</tr>

<tr>
<td BGCOLOR="#CCFFCC">&nbsp;</td>

    <td WIDTH="50%" BGCOLOR="#CCFFCC"><b><tt>09 09 FF FF</tt></b></td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Clear to send variable</i></td>
</tr>

<tr>
<td BGCOLOR="#FFCCCC">TI:</td>

    <td WIDTH="50%" BGCOLOR="#FFCCCC"><b><tt>89 56 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Acknowledgement of CTS</i></td>
</tr>

<tr>
<td BGCOLOR="#FFCCCC">&nbsp;</td>

    <td WIDTH="50%" BGCOLOR="#FFCCCC"><tt><b>89 15 09 00 </b>00 00 00 00 00 03 
      01 01 1F <b>24 00</b></tt></td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Variable data: ?</i></td>
</tr>

<tr>
<td BGCOLOR="#CCFFCC">PC:</td>

    <td WIDTH="50%" BGCOLOR="#CCFFCC"><b><tt>09 56 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Acknowledgement of variable data</i></td>
</tr>

<tr NOSAVE>
<td BGCOLOR="#FFCCCC">TI:</td>

    <td WIDTH="50%" BGCOLOR="#FFCCCC" NOSAVE><b><tt>89 92 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><i>End Of Transmission</i></td>
</tr>

<tr BGCOLOR="#99FFCC" NOSAVE>
<td BGCOLOR="#CCFFCC">PC:</td>

    <td WIDTH="50%" BGCOLOR="#CCFFCC" NOSAVE><b><tt>09 56 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#CCFFCC" NOSAVE><i>Acknowledgement of EOT</i></td>
</tr>
</table>

<h4>
<a NAME="rts"></a>Sending a Variable</h4>
There are two ways to send a variable: with a folder name (such as 'main\str')
or without a folder name (such as 'str'). If no folder is specified, the
variable is sent to the current directory on the calculator.
<p>The protocol for sending a variable to the calculator is shown below.
<table BORDER CELLSPACING=0 WIDTH="92%" BGCOLOR="#FFFFFF" >
<tr>
<th WIDTH="7%" BGCOLOR="#008800"><font color="#FFFFFF">Step</font></th>

<th COLSPAN="3" BGCOLOR="#008800"><font color="#FFFFFF">Direction</font></th>

<th WIDTH="80%" BGCOLOR="#008800"><font color="#FFFFFF">Packet</font></th>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>1&nbsp;</center>
</td>

<td ROWSPAN="8">
<center><img SRC="graphics/comp.gif" ALT="Computer" BORDER=0 height=33 width=30 align=BOTTOM></center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td ROWSPAN="8">
<center><img SRC="graphics/calc.gif" ALT="Calculator" BORDER=0 height=35 width=60 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">RTS (specifing the size with the extra
four bytes)</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>2&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">ACK</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>3&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">CTS or SKIP/EXIT (see note below)</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>4&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">ACK</td>
</tr>

<tr>
<td WIDTH="7%">
<center>5&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">DATA</td>
</tr>

<tr>
<td WIDTH="7%">
<center>6&nbsp;</center>
</td>

<td>
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%">ACK</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>7&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/right.gif" ALT="===>" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">EOT<i> -</i> if there are several variables
to transmit, steps 7 and 8 can be skipped until the last variable.</td>
</tr>

<tr>
<td WIDTH="7%" BGCOLOR="#FFFFFF">
<center>8&nbsp;</center>
</td>

<td BGCOLOR="#FFFFFF">
<center><img SRC="graphics/left.gif" ALT="<===" BORDER=0 height=13 width=22 align=BOTTOM></center>
</td>

<td WIDTH="80%" BGCOLOR="#FFFFFF">ACK</td>
</tr>
</table>
<i>Note: If the calculator sends a MEM packet in step 3, it does not have
enough free memory to accomodate the variable. In this case, step 3 will
be the end of the transfer.</i>
<p>Again, the data section contains the variable data.
<p><u>Example:</u>
<table BORDER=0 CELLSPACING=0 WIDTH="100%" >
<tr>
<td BGCOLOR="#CCFFCC">PC:</td>

    <td WIDTH="50%" BGCOLOR="#CCFFCC"><tt><b>09 06 0D 00 </b>0C 00 00 00 0C 07 
      74 64 73 5C 73 74 72 <b>20 03</b></tt></td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Request to send String "str" in the
"tds" folder</i></td>
</tr>

<tr>
<td BGCOLOR="#FFCCCC">TI:</td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><b><tt>89 56 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Acknowledgement of request</i></td>
</tr>

<tr>
<td BGCOLOR="#FFCCCC">&nbsp;</td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><b><tt>89 09 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Clear to send variable</i></td>
</tr>

<tr>
<td BGCOLOR="#CCFFCC">PC:</td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><b><tt>09 56 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Acknowledgement of CTS</i></td>
</tr>

<tr>
<td BGCOLOR="#CCFFCC">&nbsp;</td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><tt><b>09 15 0C 00 </b>00 00 00 00 00
06 00 61 62 63 00 2D <b>59 01</b></tt></td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><i>Variable data: "abc"</i></td>
</tr>

<tr>
<td BGCOLOR="#FFCCCC">TI:</td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><b><tt>89 56 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Acknowledgement of data</i></td>
</tr>

<tr>
<td BGCOLOR="#CCFFCC">PC:</td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><b><tt>09 92 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#CCFFCC"><i>End Of Transmission</i></td>
</tr>

<tr>
<td BGCOLOR="#FFCCCC">TI:</td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><b><tt>89 56 00 00</tt></b></td>

<td WIDTH="50%" BGCOLOR="#FFCCCC"><i>Acknowledgement of EOT</i></td>
</tr>
</table>

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