DOCS/vt102-ug/table6-14.html


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<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%">
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<TD ALIGN="LEFT"><A HREF="chapter6.html">Chapter 6</A></TD>
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<TABLE ID="T6-14" CLASS="majortable" FRAME="VOID" RULES="GROUPS" CELLSPACING="0" CELLPADDING="4" BORDERCOLOR="#ffffff">
<CAPTION>Table 6-14 Printer Interface Signals</CAPTION>
<THEAD>
<TR VALIGN="BOTTOM">
<TH>Pin</TH>
<TH>Name (Mnemonic)</TH>
<TH>CCITT&nbsp;/ EIA</TH>
<TH>Description</TH>
</TR>
</THEAD>
<TBODY>
<TR VALIGN="TOP">
<TD>1</TD>
<TD>Protective ground<BR>(PGND)</TD>
<TD>101/AA</TD>
<TD>Connects to terminal chassis. Also connects to external ground lead of ac power cord.</TD>
</TR>
<TR VALIGN="TOP">
<TD>2</TD>
<TD>Transmit data<BR>(TXD)</TD>
<TD>103/BA</TD>
<TD>From VT102:<BR>Terminal transmits serial characters on TXD to printer. TXD held in
mark state when characters are not transmitted.</TD>
</TR>
<TR VALIGN="TOP">
<TD>3</TD>
<TD>Receive data<BR>(RXD)</TD>
<TD>104/BB</TD>
<TD>To VT102:<BR>Terminal receives XON and XOFF control characters on RXD. All other
characters ignored.</TD>
</TR>
<TR VALIGN="TOP">
<TD>6</TD>
<TD>Data set ready<BR>(DSR)</TD>
<TD>107/CC</TD>
<TD>To VT102:<BR>Terminal receives DTR from printer on DSR. If DTR from printer has not
been on since power up or reset, terminal ignores all print requests. When DTR from
printer is on, DSR indicates printer status. If DTR turns off, terminal assumes that
printer cannot receive characters. If DTR turns on again, print operation completes.</TD>
</TR>
<TR VALIGN="TOP">
<TD COLSPAN="4"><P CLASS="note">NOTE: The printer's DTR has a higher priority than XON/XOFF
control characters. When the printer's DTR is off, data transmission stops even if the
printer interface option receives XON. When the printer's DTR goes from off to on, the
terminal assumes that the XON condition is indicated.</P></TD>
</TR>
<TR VALIGN="TOP">
<TD>7</TD>
<TD>Signal ground<BR>(SGND)</TD>
<TD>102/AB</TD>
<TD>SGND is common ground reference potential for all voltages on interface.</TD>
</TR>
<TR VALIGN="TOP">
<TD>20</TD>
<TD>Data terminal ready<BR>(DTR)</TD>
<TD>108.2/CD</TD>
<TD>From VT102:<BR>DTR is on when terminal is on. Printer usually receives DTR as DSR.
Printer usually needs DTR before operation can begin.</TD>
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<TD ALIGN="LEFT"><A HREF="chapter6.html">Chapter 6</A></TD>
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