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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<HTML>
+<HEAD>
+<TITLE>VT100.net: Digital VT102 User Guide</TITLE>
+<LINK HREF="vt102-ug.css" TYPE="text/css" REL="stylesheet">
+</HEAD>
+<BODY>
+<DIV CLASS="navbar"><A HREF="http://vt100.net/"><IMG CLASS="button" SRC="vt100.net-logo.png" ALT="VT100.net" HEIGHT="16" WIDTH="102"></A> VT102 User Guide<TABLE WIDTH="100%">
+<COL SPAN="3" WIDTH="33%">
+<TBODY>
+<TR>
+<TD ALIGN="LEFT"><A HREF="chapter6.html">Chapter 6</A></TD>
+<TD ALIGN="CENTER"><A HREF="contents.html">Contents</A></TD>
+<TD ALIGN="RIGHT">&nbsp;</TD>
+</TR>
+</TBODY>
+</TABLE>
+<HR></DIV>
+<TABLE ID="T6-7" CLASS="majortable" FRAME="VOID" RULES="GROUPS" CELLSPACING="0" CELLPADDING="4" BORDERCOLOR="#ffffff">
+<CAPTION>Table 6-7 Asymmetric Full-Duplex with Modem Control (FDX C) Signals</CAPTION>
+<THEAD>
+<TR VALIGN="BOTTOM">
+<TH>Pin</TH>
+<TH>Name (Mnemonic)</TH>
+<TH>CCITT&nbsp;/ EIA</TH>
+<TH>Switch</TH>
+<TH>Description</TH>
+</TR>
+</THEAD>
+<TBODY>
+<TR VALIGN="TOP">
+<TD>1</TD>
+<TD>Protective ground<BR>(PGND)</TD>
+<TD>101/AA</TD>
+<TD>-</TD>
+<TD>Connects to terminal chassis. Also connects to external ground through third wire of
+power cord.</TD>
+</TR>
+<TR VALIGN="TOP">
+<TD>3</TD>
+<TD>Received data<BR>(RXD)</TD>
+<TD>104/BB</TD>
+<TD>-</TD>
+<TD>To VT102:<BR>RXD receives serial characters from the computer.</TD>
+</TR>
+<TR VALIGN="TOP">
+<TD>6</TD>
+<TD>Data set ready<BR>(DSR)</TD>
+<TD>107/CC</TD>
+<TD>-</TD>
+<TD>From VT102:<BR>When DSR is on:
+<UL>
+<LI>DSR indicator is on</LI>
+<LI>Modem connects to a communication line</LI>
+<LI>Modem is ready to use modem control signals.</LI>
+</UL>
+When DSR is off:
+<UL>
+<LI>DSR indicator is off</LI>
+<LI>Terminal performs a disconnect.</LI>
+</UL></TD>
+</TR>
+<TR VALIGN="TOP">
+<TD>7</TD>
+<TD>Signal ground<BR>(SGND)</TD>
+<TD>102/AB</TD>
+<TD>-</TD>
+<TD>SGND is common ground reference potential for all connector signals except protective
+ground. SGND connects to protective ground conductor.</TD>
+</TR>
+<TR VALIGN="TOP">
+<TD>8</TD>
+<TD>Receive line signal detector<BR>(RLSD)</TD>
+<TD>109/CF</TD>
+<TD>-</TD>
+<TD>To VT102:<BR>Also called carrier detect, RLSD is on when communication line signals
+are good enough to transfer data. When off, data received is ignored.</TD>
+</TR>
+<TR VALIGN="TOP">
+<TD>13</TD>
+<TD>Secondary clear to send<BR>(SCTS)</TD>
+<TD>121/SCB</TD>
+<TD>S3</TD>
+<TD>To VT102:<BR>When switch S3 is on (closed), SCTS indicates when modem is ready to
+transmit data. When on, modem is ready to transmit data and CTS indicator is on. When
+off, modem is not ready to transmit data and CTS indicator is off.</TD>
+</TR>
+<TR VALIGN="TOP">
+<TD COLSPAN="5"><P CLASS="note">NOTE: When S3 is on (closed), switch S2 must be off (open).</P></TD>
+</TR>
+<TR VALIGN="TOP">
+<TD>14</TD>
+<TD>Secondary transmit data<BR>(STXD)</TD>
+<TD>118/SBA</TD>
+<TD>S7</TD>
+<TD>When switch S7 is closed, STXD transmits serial characters and breaks generated by
+terminal. STXD is in mark state when no characters are transmitted.</TD>
+</TR>
+<TR VALIGN="TOP">
+<TD COLSPAN="5"><P CLASS="note">NOTE: When S7 is on (closed), switch S6 must be off (open).</P></TD>
+</TR>
+<TR VALIGN="TOP">
+<TD>19</TD>
+<TD>Secondary request to send<BR>(SRTS)</TD>
+<TD>120/SCA</TD>
+<TD>S8</TD>
+<TD>To VT102:<BR>When switch S8 is closed, SRTS is on if terminal is on-line and off if
+terminal is off-line.</TD>
+</TR>
+<TR VALIGN="TOP">
+<TD COLSPAN="5"><P CLASS="note">NOTE: Switch S5 must be off (open).</P></TD>
+</TR>
+<TR VALIGN="TOP">
+<TD>20</TD>
+<TD>Data terminal ready<BR>(DTR)</TD>
+<TD>108.2/CD</TD>
+<TD>-</TD>
+<TD>From VT102:<BR>DTR is on when terminal is on-line and off when terminal is
+off-line or performing a disconnect. When on, modem can usually answer calls
+(modem auto answer option). When off, modem disconnects and does not
+answer calls.</TD>
+</TR>
+<TR VALIGN="TOP">
+<TD>23</TD>
+<TD>Speed select<BR>(SPSD)</TD>
+<TD>111/CH</TD>
+<TD>S10</TD>
+<TD>From VT102:<BR>SPSD is on when receive speed SET-UP feature selection is greater
+than 600 baud. SPSD is off when speed is 600 baud or less.</TD>
+</TR>
+</TBODY>
+</TABLE>
+<DIV CLASS="navbar"><HR>
+<TABLE WIDTH="100%">
+<COL SPAN="3" WIDTH="33%">
+<TBODY>
+<TR>
+<TD ALIGN="LEFT"><A HREF="chapter6.html">Chapter 6</A></TD>
+<TD ALIGN="CENTER"><A HREF="contents.html">Contents</A></TD>
+<TD ALIGN="RIGHT">&nbsp;</TD>
+</TR>
+</TBODY>
+</TABLE>
+<DIV CLASS="navbot">http://vt100.net/docs/vt102-ug/table6-7.html</DIV></DIV>
+</BODY>
+</HTML>