chapter3.html

VT100向导

<TR>
<TD><STRONG><CODE>ESC 8</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>This sequence causes the previously saved cursor position, graphic rendition, and
character set to be restored.</P>
<H4 ID="DECREPTPARM"><SPAN CLASS="mnemonic">DECREPTPARM</SPAN> -- Report Terminal Parameters</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ &lt;sol&gt;; &lt;par&gt;; &lt;nbits&gt;; &lt;xspeed&gt;;
&lt;rspeed&gt;; &lt;clkmul&gt;; &lt;flags&gt; x</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>These sequence parameters are explained below in the DECREQTPARM sequence.</P>
<H4 ID="DECREQTPARM"><SPAN CLASS="mnemonic">DECREQTPARM</SPAN> -- Request Terminal Parameters</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ &lt;sol&gt; x</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>The sequence DECREPTPARM is sent by the terminal controller to notify the host
of the status of selected terminal parameters. The status sequence may be sent
when requested by the host or at the terminal's discretion. DECREPTPARM is sent
upon receipt of a DECREQTPARM. On power-up or reset, the VT100 is inhibited
from sending unsolicited reports.</P>
<P>The meanings of the sequence parameters are:</P>
<TABLE WIDTH="100%" FRAME="HSIDES" RULES="GROUPS" CELLSPACING="0" CELLPADDING="3">
<COL WIDTH="20%">
<COL WIDTH="20%">
<COL WIDTH="20%">
<COL WIDTH="40%">
<THEAD>
<TR>
<TH>Parameter</TH>
<TH>Value</TH>
<TH COLSPAN="2">Meaning</TH>
</TR>
</THEAD>
<TBODY>
<TR VALIGN="TOP">
<TD ROWSPAN="4">&lt;sol&gt;</TD>
<TD>0 or none</TD>
<TD COLSPAN="2">This message is a request (DECREQTPARM) and
the terminal will be allowed to send unsolicited reports.
(Unsolicited reports are sent when the terminal
exits the SET-UP mode).</TD>
</TR>
<TR VALIGN="TOP">
<TD>1</TD>
<TD COLSPAN="2">This message is a request; from now on the terminal
may only report in response to a request.</TD>
</TR>
<TR VALIGN="TOP">
<TD>2</TD>
<TD COLSPAN="2">This message is a report (DECREPTPARM).</TD>
</TR>
<TR VALIGN="TOP">
<TD>3</TD>
<TD COLSPAN="2">This message is a report and the terminal is only
reporting on request.</TD>
</TR>
</TBODY>
<TBODY>
<TR VALIGN="TOP">
<TD ROWSPAN="3">&lt;par&gt;</TD>
<TD>1</TD>
<TD COLSPAN="2">No parity set</TD>
</TR>
<TR VALIGN="TOP">
<TD>4</TD>
<TD COLSPAN="2">Parity is set and odd</TD>
</TR>
<TR VALIGN="TOP">
<TD>5</TD>
<TD COLSPAN="2">Parity is set and even</TD>
</TR>
</TBODY>
<TBODY>
<TR VALIGN="TOP">
<TD ROWSPAN="2">&lt;nbits&gt;</TD>
<TD>1</TD>
<TD COLSPAN="2">8 bits per character</TD>
</TR>
<TR VALIGN="TOP">
<TD>2</TD>
<TD COLSPAN="2">7 bits per character</TD>
</TR>
</TBODY>
<TBODY>
<TR VALIGN="MIDDLE">
<TD ROWSPAN="16">&lt;xspeed&gt;, &lt;rspeed&gt;</TD>
<TD>0</TD>
<TD>50</TD>
<TD ROWSPAN="16">Bits per second</TD>
</TR>
<TR VALIGN="TOP">
<TD>8</TD>
<TD>75</TD>
</TR>
<TR VALIGN="TOP">
<TD>16</TD>
<TD>110</TD>
</TR>
<TR VALIGN="TOP">
<TD>24</TD>
<TD>134.5</TD>
</TR>
<TR VALIGN="TOP">
<TD>32</TD>
<TD>150</TD>
</TR>
<TR VALIGN="TOP">
<TD>40</TD>
<TD>200</TD>
</TR>
<TR VALIGN="TOP">
<TD>48</TD>
<TD>300</TD>
</TR>
<TR VALIGN="TOP">
<TD>56</TD>
<TD>600</TD>
</TR>
<TR VALIGN="TOP">
<TD>64</TD>
<TD>1200</TD>
</TR>
<TR VALIGN="TOP">
<TD>72</TD>
<TD>1800</TD>
</TR>
<TR VALIGN="TOP">
<TD>80</TD>
<TD>2000</TD>
</TR>
<TR VALIGN="TOP">
<TD>88</TD>
<TD>2400</TD>
</TR>
<TR VALIGN="TOP">
<TD>96</TD>
<TD>3600</TD>
</TR>
<TR VALIGN="TOP">
<TD>104</TD>
<TD>4800</TD>
</TR>
<TR VALIGN="TOP">
<TD>112</TD>
<TD>9600</TD>
</TR>
<TR VALIGN="TOP">
<TD>120</TD>
<TD>19200</TD>
</TR>
</TBODY>
<TBODY>
<TR VALIGN="TOP">
<TD>&lt;clkmul&gt;</TD>
<TD>1</TD>
<TD COLSPAN="2">The bit rate multiplier is 16.</TD>
</TR>
</TBODY>
<TBODY>
<TR VALIGN="TOP">
<TD>&lt;flags&gt;</TD>
<TD>0-15</TD>
<TD COLSPAN="2">This value communicates the four switch values in
block 5 of SET&nbsp;UP&nbsp;B, which are only visible to the
user when an STP option is installed. These bits may
be assigned for an STP device. The four bits are a
decimal-encoded binary number.</TD>
</TR>
</TBODY>
</TABLE>
<H4 ID="DECSC"><SPAN CLASS="mnemonic">DECSC</SPAN> -- Save Cursor (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC 7</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>This sequence causes the cursor position, graphic rendition, and character set to
be saved. (See DECRC).</P>
<H4 ID="DECSCLM"><SPAN CLASS="mnemonic">DECSCLM</SPAN> -- Scrolling Mode (DEC Private)</H4>
<P>This is a private parameter applicable to set mode (SM) and reset mode (RM)
control sequences. The reset state causes scrolls to "jump" instantaneously. The
set state causes scrolls to be "smooth" at a maximum rate of six lines per second.</P>
<H4 ID="DECSCNM"><SPAN CLASS="mnemonic">DECSCNM</SPAN> -- Screen Mode (DEC Private)</H4>
<P>This is a private parameter applicable to set mode (SM) and reset mode (RM)
control sequences. The reset state causes the screen to be black with white characters.
The set state causes the screen to be white with black characters.</P>
<H4 ID="DECSTBM"><SPAN CLASS="mnemonic">DECSTBM</SPAN> -- Set Top and Bottom Margins (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Pn; Pn r</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default values: see below</EM></TD>
</TR>
</TBODY>
</TABLE>
<P>This sequence sets the top and bottom margins to define the scrolling region. The
first parameter is the line number of the first line in the scrolling region; the second
parameter is the line number of the bottom line in the scrolling region. Default is
the entire screen (no margins). The minimum size of the scrolling region allowed is
two lines, i.e., the top margin must be less than the bottom margin. The cursor is
placed in the home position (see Origin Mode DECOM).</P>
<H4 ID="DECSWL"><SPAN CLASS="mnemonic">DECSWL</SPAN> -- Single-width Line (DEC Private)</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC # 5</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>This causes the line which contains the active position to become single-width
single-height. The cursor remains on the same character position. This is the
default condition for all new lines on the screen.</P>
<H4 ID="DECTST"><SPAN CLASS="mnemonic">DECTST</SPAN> -- Invoke Confidence Test</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ 2 ; Ps y</CODE></STRONG></TD>
<TD ALIGN="RIGHT">&nbsp;</TD>
</TR>
</TBODY>
</TABLE>
<P>Ps is the parameter indicating the test to be done. Ps is computed by taking the
weight indicated for each desired test and adding them together. If Ps is 0, no test
is performed but the VT100 is reset.</P>
<TABLE WIDTH="100%">
<COL WIDTH="50%">
<COL WIDTH="50%">
<THEAD>
<TR>
<TH>Test</TH>
<TH>Weight</TH>
</TR>
</THEAD>
<TBODY>
<TR VALIGN="TOP">
<TD>Power up self-test (ROM check
sum, RAM, NVR keyboard
and AVO if installed)</TD>
<TD>1</TD>
</TR>
<TR VALIGN="TOP">
<TD>Data Loop Back</TD>
<TD>2 (loop back connector required)</TD>
</TR>
<TR VALIGN="TOP">
<TD>EIA modem control test</TD>
<TD>4 (loop back connector required)</TD>
</TR>
<TR VALIGN="TOP">
<TD>Repeat Selected Test(s)<BR>
indefinitely (until failure or
power off)</TD>
<TD>8</TD>
</TR>
</TBODY>
</TABLE>
<H4 ID="DSR"><SPAN CLASS="mnemonic">DSR</SPAN> -- Device Status Report</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Ps n</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 0</TD>
</TR>
</TBODY>
</TABLE>
<P>Requests and reports the general status of the VT100 according to the following
parameter(s).</P>
<TABLE WIDTH="100%">
<COL WIDTH="20%">
<COL WIDTH="80%">
<THEAD>
<TR>
<TH>Parameter</TH>
<TH>Parameter Meaning</TH>
</TR>
</THEAD>
<TBODY>
<TR VALIGN="TOP">
<TD>0</TD>
<TD>Response from VT100 -- Ready, No malfunctions
detected (default)</TD>
</TR>
<TR VALIGN="TOP">
<TD>3</TD>
<TD>Response from VT100 -- Malfunction -- retry</TD>
</TR>
<TR VALIGN="TOP">
<TD>5</TD>
<TD>Command from host -- Please report status (using a
DSR control sequence)</TD>
</TR>
<TR VALIGN="TOP">
<TD>6</TD>
<TD>Command from host -- Please report active position
(using a CPR control sequence)</TD>
</TR>
</TBODY>
</TABLE>
<P>DSR with a parameter value of 0 or 3 is always sent as a response to a requesting
DSR with a parameter value of 5.</P>
<H4 ID="ED"><SPAN CLASS="mnemonic">ED</SPAN> -- Erase In Display</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>
<TD><STRONG><CODE>ESC [ Ps J</CODE></STRONG></TD>
<TD ALIGN="RIGHT"><EM>default value:</EM> 0</TD>
</TR>
</TBODY>
</TABLE>
<P>This sequence erases some or all of the characters in the display according to the
parameter. Any complete line erased by this sequence will return that line to single
width mode. <EM>Editor Function</EM></P>
<TABLE WIDTH="100%">
<COL WIDTH="20%">
<COL WIDTH="80%">
<THEAD>
<TR>
<TH>Parameter</TH>
<TH>Parameter Meaning</TH>
</TR>
</THEAD>
<TBODY>
<TR VALIGN="TOP">
<TD>0</TD>
<TD>Erase from the active position to the end of the
screen, inclusive (default)</TD>
</TR>
<TR VALIGN="TOP">
<TD>1</TD>
<TD>Erase from start of the screen to the active position,
inclusive</TD>
</TR>
<TR VALIGN="TOP">
<TD>2</TD>
<TD>Erase all of the display -- all lines are erased,
changed to single-width, and the cursor does not move.</TD>
</TR>
</TBODY>
</TABLE>
<H4 ID="EL"><SPAN CLASS="mnemonic">EL</SPAN> -- Erase In Line</H4>
<TABLE WIDTH="100%">
<TBODY>
<TR>