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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%">
+<COL SPAN="3" WIDTH="33%">
+<TBODY>
+<TR>
+<TD ALIGN="LEFT"><A HREF="introduction.html">Introduction</A></TD>
+<TD ALIGN="CENTER"><A HREF="contents.html">Contents</A></TD>
+<TD ALIGN="RIGHT"><A HREF="chapter2.html">Chapter 2</A></TD>
+</TR>
+</TBODY>
+</TABLE>
+<HR></DIV>
+<H1 ID="S1"><SPAN CLASS="chapnum">1</SPAN> Operating Information</H1>
+<H2 ID="S1.1">General</H2>
+<P>This chapter provides an overview of how the VT102 video terminal operates.
+The text describes all controls, indicators, and general operating
+procedures. Detailed operating information depends on the computer and
+its application software.</P>
+<H2 ID="S1.2">Terminal Operation</H2>
+<P>The terminal operates either on-line, off-line, or in SET-UP. You select on-line
+and off-line in SET-UP. <A HREF="chapter3.html">Chapter 3</A> describes SET-UP and provides information
+about selecting on-line and off-line.</P>
+<P>When the ON LINE indicator is on, the terminal can communicate with the
+computer. When on-line, the terminal serves as both an input and output
+device of the computer. <A HREF="figure1-1.html">Figure 1-1</A> shows a general block diagram of the
+terminal while on-line.</P>
+<P>As an input device, the terminal places keyboard-generated characters in
+a keyboard character buffer. The characters are then taken from the buffer
+and transmitted to the computer.</P>
+<P>As an output device, the terminal places received characters in the input
+character buffer for processing. When processing, the terminal removes
+the received characters from the buffer and either displays or prints them.</P>
+<P>When the OFF LINE indicator is on, the terminal cannot communicate with
+the computer. Characters typed on the keyboard appear on the screen.
+<A HREF="figure1-2.html">Figure 1-2</A> shows a general block diagram of the terminal while off-line.</P>
+<P>An optional serial printer connects to the terminal's printer interface.
+Therefore, you can produce printed copy without a separate communication
+line and interface to the computer. The printer can print when the
+terminal is on- or off-line.</P>
+<H2 ID="S1.3">Controls and Indicators</H2>
+<P>The terminal has five groups of controls and indicators: monitor controls,
+communication switches, keyboard controls, visual indicators, and audible
+indicators.</P>
+<H3 ID="S1.3.1">Monitor Controls</H3>
+<P>The terminal has two controls on the monitor backpanel, the voltage selection
+switch and the power switch (<A HREF="figure1-3.html">Figure 1-3</A>). The following paragraphs
+describe these monitor controls.</P>
+<H4 ID="S1.3.1.1">Voltage Selection Switch</H4>
+<P>This switch allows the terminal to operate
+with available ac input voltage range. If you change the switch position,
+you must also change the fuse. The switch position and fuse are selected
+when the terminal is installed. See <A HREF="chapter7.html">Chapter 7</A> for more information about
+installing the terminal.</P>
+<P CLASS="note">CAUTION: You may damage the terminal if you set the voltage selection
+switch to the wrong position and use the wrong fuse.</P>
+<H4 ID="S1.3.1.2">Power Switch</H4>
+<P>This switch controls ac power to the terminal. When ac
+power is on, either the ON LINE or OFF LINE indicator is on. See <A HREF="#S1.3.4">Keyboard
+Indicators</A> in this chapter for more information.</P>
+<P>Turn the terminal on (power up) by using the following procedure.</P>
+<OL>
+<LI>Turn the power switch to the on (1) position (<A HREF="figure1-3.html">Figure 1-3</A>). The terminal
+automatically runs a power-up self-test to verify terminal operation.
+The test provides the following indications:
+<UL>
+<LI>All indicators come on and go off; either the ON LINE or OFF LINE
+indicator stays on.
+<P CLASS="note">NOTE: The on or off state of other indicators depends on the
+communication signals received and terminal features selected.</P></LI>
+<LI>A bell tone sounds.</LI>
+<LI>The cursor appears in the upper-left corner of the screen.</LI>
+</UL>
+<P>If the test finds an error, the terminal provides one of the following
+indications.</P>
+<UL>
+<LI>Does not perform the above sequence</LI>
+<LI>Displays character(s) on the screen</LI>
+<LI>Sounds several bell tones</LI>
+</UL></LI>
+</OL>
+<P>See <A HREF="chapter9.html">Chapter 9</A> if the terminal does not power up correctly.</P>
+<H3 ID="S1.3.2">Internal Communication Switches</H3>
+<P>The terminal has two types of internal switches, communication switches
+and 20 mA current loop option switches. The following paragraphs describe
+these switches.</P>
+<H4 ID="S1.3.2.1">Communication Switches</H4>
+<P>These ten switches select the communication
+lines used by the modem connector. The switches are set during
+installation. See <A HREF="chapter7.html">Chapter 7</A> for the selection procedure.</P>
+<H4 ID="S1.3.2.2">20 mA Current Loop Option Switches</H4>
+<P>The 20 mA current loop option
+(VT1XX-CA) has two switches that select active or normal (passive) operation
+for the transmitter and receiver. See <A HREF="chapter8.html">Chapter 8</A> for more information
+about the 20 mA current loop option.</P>
+<H3 ID="S1.3.3">Keyboard Controls</H3>
+<P>The terminal keyboard has a main keyboard and numeric keypad (<A HREF="figure1-4.html">Figure
+1-4</A>). The main keyboard looks and operates like a standard typewriter.
+The numeric keypad allows rapid entry of numeric data or function characters
+(used with some application software). The keys are divided into
+four groups: standard keys, function keys, printing keys, and SET-UP
+keys.</P>
+<H4 ID="S1.3.3.1">Standard Keys</H4>
+<P><A HREF="figure1-5.html">Figure 1-5</A> identifies the standard typewriter and calculator
+keys. The computer can select the numeric keypad to generate the
+same characters as the main keyboard. The minus, comma, period, and
+numeric keys on the keypad operate like the corresponding unshifted
+keys on the keyboard.</P>
+<P><SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">CAPS LOCK</SPAN> modify standard key characters. They do not
+modify numeric keypad characters. The following paragraphs describe <SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">CAPS LOCK</SPAN>. <A HREF="chapter4.html">Chapter 4</A> describes all the characters generated
+by the standard keys.</P>
+<P><IMG SRC="keys/br/shift1.png" ALT="" HEIGHT="40" WIDTH="94"> <STRONG>SHIFT</STRONG><BR>
+When you hold down <SPAN CLASS="keyname">SHIFT</SPAN>, the standard keys on the main keyboard generate
+uppercase characters. You can also use <SPAN CLASS="keyname">SHIFT</SPAN> with the function,
+printing, and SET-UP keys. See the following paragraphs in this chapter
+for more information.</P>
+<P><IMG SRC="keys/br/capslock.png" ALT="" HEIGHT="40" WIDTH="72"> <STRONG>CAPS LOCK</STRONG><BR>
+This is a two-position locking key. If you lock down <SPAN CLASS="keyname">CAPS LOCK</SPAN>, the alphabetic
+keys generate uppercase characters. If you release <SPAN CLASS="keyname">CAPS
+LOCK</SPAN>, the alphabetic keys generate lowercase characters. <SPAN CLASS="keyname">CAPS LOCK</SPAN>
+does not affect the function and numeric keypad keys.</P>
+<P CLASS="note">NOTE: <SPAN CLASS="keyname">CAPS LOCK</SPAN> does not affect the numeric and special symbol
+keys. Therefore, <SPAN CLASS="keyname">CAPS LOCK</SPAN> does not operate like the <SPAN CLASS="keyname">SHIFT LOCK</SPAN> of a
+typewriter.</P>
+<H4 ID="S1.3.3.2">Function Keys</H4>
+<P><A HREF="figure1-6.html">Figure 1-6</A> identifies the function keys. The computer
+can also select the numeric keypad to generate function characters. The
+application software or communication system define the use of function
+keys. <A HREF="chapter4.html">Chapter 4</A> describes all the characters generated by the function
+keys. The following paragraphs provide a general description of each
+function key.</P>
+<P><IMG SRC="keys/br/noscroll.png" ALT="" HEIGHT="40" WIDTH="40"> <STRONG>NO SCROLL</STRONG><BR>
+This key controls scrolling on the screen. Scrolling is the upward or downward
+movement of existing lines on the screen to allow new lines to appear.
+When you first press this key, scrolling stops and new characters
+cannot appear. When pressed again, scrolling continues and new characters
+can appear.</P>
+<P CLASS="note">NOTE: <SPAN CLASS="keyname">NO SCROLL</SPAN> operates only in full-duplex communication with the
+auto XON/XOFF SET-UP feature on. This key does not operate with the
+auto XON/XOFF feature off or with half-duplex communication.</P>
+<P><IMG SRC="keys/br/breakhereis.png" ALT="" HEIGHT="40" WIDTH="40"> <STRONG>BREAK/HERE IS</STRONG><BR>
+This key generates a break when the break enable SET-UP feature is on.
+See <A HREF="chapter3.html">Chapter 3</A> for more information about SET-UP features and <A HREF="chapter6.html">Chapter 6</A>
+for more information about break.</P>
+<P>When you hold down <SPAN CLASS="keyname">SHIFT</SPAN>, <SPAN CLASS="keyname">BREAK</SPAN> generates a long break disconnect.
+With some modems, a long break disconnect causes a communication
+(phone) line disconnect. See <A HREF="chapter6.html#S6.2.3">Break</A> in <A HREF="chapter6.html">Chapter 6</A> for more information
+about long break disconnects.</P>
+<P>When you hold down <SPAN CLASS="keyname">CTRL</SPAN>, <SPAN CLASS="keyname">HERE IS</SPAN> transmits the answerback message.
+The answerback message identifies the terminal to the computer. You enter
+the answerback message in SET-UP. See <A HREF="chapter3.html">Chapter 3</A> for more information
+about the answerback SET-UP feature.</P>
+<P><IMG SRC="keys/br/arrows.png" ALT="[Up] [Down] [Left] [Right]" HEIGHT="40" WIDTH="172"> <STRONG>Cursor Control Keys</STRONG><BR>
+These keys are defined by the application software. However, they usually
+generate cursor control commands. The cursor is a screen indicator
+showing the line and column where the next character will appear.</P>
+<P><IMG SRC="keys/br/esc.png" ALT="" HEIGHT="40" WIDTH="40"> <STRONG>ESC</STRONG><BR>
+This key generates the escape (ESC) control character, defined by the
+application software.</P>
+<P><IMG SRC="keys/br/tab.png" ALT="" HEIGHT="40" WIDTH="60"> <STRONG>TAB</STRONG><BR>
+This key generates the tab (TAB) control character, defined by the application
+software.</P>
+<P><IMG SRC="keys/br/ctrl.png" ALT="" HEIGHT="40" WIDTH="40"> <STRONG>CTRL</STRONG><BR>
+When you hold down <SPAN CLASS="keyname">CTRL</SPAN>, pressing another key may generate a control
+character defined by the application software. <A HREF="chapter4.html">Chapter 4</A> describes the
+control character.</P>
+<P>You can also use <SPAN CLASS="keyname">CTRL</SPAN> with the <SPAN CLASS="keyname">HERE IS</SPAN> and printing keys. See the description
+of these keys in this chapter for more information.</P>
+<P><IMG SRC="keys/br/backspace.png" ALT="" HEIGHT="40" WIDTH="40"> <STRONG>BACK SPACE</STRONG><BR>
+This key generates the back space (BS) control character, defined by the
+application software.</P>
+<P><IMG SRC="keys/br/delete.png" ALT="" HEIGHT="40" WIDTH="40"> <STRONG>DELETE</STRONG><BR>
+This key generates the delete (DEL) control character, defined by the application
+software.</P>
+<P><IMG SRC="keys/br/return1.png" ALT="" HEIGHT="84" WIDTH="60"> <STRONG>RETURN</STRONG><BR>
+This key generates either a carriage return, or carriage return and linefeed.
+The linefeed/new line SET-UP feature selects the characters generated.
+See <A HREF="chapter3.html">Chapter 3</A> for more information about this feature.</P>
+<P>When using half-duplex coded control (HDX B), <SPAN CLASS="keyname">RETURN</SPAN> may also automatically
+generate a line turnaround character. Setting the auto turnaround
+SET-UP feature selects automatic generation. Setting the turnaround/disconnect
+character SET-UP feature selects the turnaround
+character. See <A HREF="chapter3.html">Chapter 3</A> for more information about these features.</P>
+<P><IMG SRC="keys/br/linefeed.png" ALT="" HEIGHT="40" WIDTH="40"> <STRONG>LINE FEED</STRONG><BR>
+This key generates the linefeed (LF) control character, defined by the application
+software.</P>
+<H4 ID="S1.3.3.3">Printing Keys</H4>
+<P><A HREF="figure1-7.html">Figure 1-7</A> identifies the keys that control printing. The
+optional serial printer can print when the terminal is on- or off-line. The
+following paragraph describes the (<SPAN CLASS="keyname">PRINT</SPAN>) key. See <A HREF="chapter2.html">Chapter 2</A> for more
+information about printing operations.</P>
+<P><IMG SRC="keys/br/printenter.png" ALT="" HEIGHT="84" WIDTH="40"> <STRONG>(PRINT)/ENTER</STRONG><BR>
+This key works with <SPAN CLASS="keyname">CTRL</SPAN> and <SPAN CLASS="keyname">SHIFT</SPAN> to control printing. When you hold
+down <SPAN CLASS="keyname">CTRL</SPAN>, <SPAN CLASS="keyname">(PRINT)</SPAN> turns the auto print (line-at-a-time printing) operation
+on and off. When you hold down <SPAN CLASS="keyname">SHIFT</SPAN>, <SPAN CLASS="keyname">(PRINT)</SPAN> causes a print screen
+operation.</P>
+<H4 ID="S1.3.3.4">SET-UP Keys</H4>
+<P><A HREF="figure1-8.html">Figure 1-8</A> identifies the keys used in SET-UP. SET-UP
+lets you select terminal features from the keyboard. SET-UP is divided
+into SET-UP A and SET-UP B displays. Both displays show a summary of
+feature selections. <A HREF="chapter3.html">Chapter 3</A> provides both SET-UP feature descriptions
+and step-by-step feature selection procedures. Read <A HREF="chapter3.html">Chapter 3</A> before
+using the SET-UP keys. The following paragraphs describe these keys.</P>
+<P><IMG SRC="keys/br/setup.png" ALT="" HEIGHT="40" WIDTH="60"> <STRONG>SET-UP</STRONG><BR>
+This key places the terminal in SET-UP. In SET-UP, you can change the
+terminal SET-UP features.</P>
+<P><IMG SRC="keys/br/2.png" ALT="[2]" HEIGHT="40" WIDTH="40"> <STRONG>SET/CLEAR TAB</STRONG><BR>
+In SET-UP A, this key sets or clears individual horizontal tab stops.
+<SPAN CLASS="keyname">SET/CLEAR TAB</SPAN> does not operate in SET-UP B.</P>
+<P><IMG SRC="keys/br/3.png" ALT="[3]" HEIGHT="40" WIDTH="40"> <STRONG>CLEAR ALL TABS</STRONG><BR>
+In SET-UP A, this key clears all horizontal tab stops, <SPAN CLASS="keyname">CLEAR ALL TABS</SPAN>
+does not operate in SET-UP B.</P>
+<P><IMG SRC="keys/br/4.png" ALT="[4]" HEIGHT="40" WIDTH="40"> <STRONG>ON/OFF LINE</STRONG><BR>
+In any SET-UP display, this key switches the terminal between on-line and
+off-line. While on-line, the terminal can communicate with the computer.
+While off-line, the terminal cannot communicate with the computer; keyboard
+entries appear on the screen. The optional serial printer can print
+when the terminal is on- or off-line.</P>
+<P><IMG SRC="keys/br/5.png" ALT="[5]" HEIGHT="40" WIDTH="40"> <STRONG>SETUP A/B</STRONG><BR>
+In any SET-UP display, this key switches the terminal between SET-UP A
+and SET-UP B.</P>
+<P><IMG SRC="keys/br/6.png" ALT="[6]" HEIGHT="40" WIDTH="40"> <STRONG>TOGGLE 1/0</STRONG><BR>
+In SET-UP B, this key changes the feature selected by the cursor.
+<SPAN CLASS="keyname">TOGGLE 1/0</SPAN> does not operate in SET-UP A.</P>
+<P><IMG SRC="keys/br/7.png" ALT="[7]" HEIGHT="40" WIDTH="40"> <STRONG>TRANSMIT SPEED</STRONG><BR>
+In SET-UP B, this key selects the transmit speed (baud rate) for either the
+modem or printer interface. <SPAN CLASS="keyname">TRANSMIT SPEED</SPAN> does not operate in SET-UP
+A.</P>
+<P><IMG SRC="keys/br/8.png" ALT="[8]" HEIGHT="40" WIDTH="40"> <STRONG>RECEIVE SPEED</STRONG><BR>
+In SET-UP B, this key selects the receive speed (baud rate) for either the
+modem or printer interface. <SPAN CLASS="keyname">RECEIVE SPEED</SPAN> does not operate in SET-UP
+A.</P>
+<P><IMG SRC="keys/br/9.png" ALT="[9]" HEIGHT="40" WIDTH="40"> <STRONG>80/132 COLUMNS</STRONG><BR>
+In SET-UP A, this key selects the display line size (80 or 132 columns per
+line). <SPAN CLASS="keyname">80/132 COLUMNS</SPAN> does not operate in SET-UP B.</P>
+<P><IMG SRC="keys/br/0.png" ALT="[0]" HEIGHT="40" WIDTH="40"> <STRONG>RESET</STRONG><BR>
+In any SET-UP display, this key starts the reset sequence. Pressing
+<SPAN CLASS="keyname">RESET</SPAN> is the same as turning the power switch off and on.</P>
+<P><IMG SRC="keys/br/arrowsud.png" ALT="[Up] [Down]" HEIGHT="40" WIDTH="84"> <STRONG>Screen Brightness Keys</STRONG><BR>
+In any SET-UP display, <IMG SRC="arrowup.png" ALT="[Up]" HEIGHT="15" WIDTH="12"> increases and <IMG SRC="arrowdown.png" ALT="[Down]" HEIGHT="15" WIDTH="12"> decreases the screen brightness.</P>
+<P><IMG SRC="keys/br/arrowslr.png" ALT="[Left] [Right]" HEIGHT="40" WIDTH="84"> <STRONG>Modem/Printer Select Keys</STRONG><BR>
+In any SET-UP display, <IMG SRC="arrowleft.png" ALT="[Left]" HEIGHT="15" WIDTH="12"> and <IMG SRC="arrowright.png" ALT="[Right]" HEIGHT="15" WIDTH="12"> move the cursor left and right. In SET-UP
+B, the arrow keys and <SPAN CLASS="keyname">SHIFT</SPAN> select either the modem or printer interface
+features. When you hold down <SPAN CLASS="keyname">SHIFT</SPAN>, <IMG SRC="arrowleft.png" ALT="[Left]" HEIGHT="15" WIDTH="12"> selects modem features and <IMG SRC="arrowright.png" ALT="[Right]" HEIGHT="15" WIDTH="12">
+selects printer features.</P>
+<P><IMG SRC="keys/br/a.png" ALT="[A]" HEIGHT="40" WIDTH="40"> <STRONG>Answerback</STRONG><BR>
+In SET-UP B, <SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">A</SPAN> let you create the answerback message. Hold
+down <SPAN CLASS="keyname">SHIFT</SPAN> and press <SPAN CLASS="keyname">A</SPAN>; then type the answerback message. You can
+use any keyboard key. The terminal stores this identifying message for
+transmission to the computer.</P>
+<P><IMG SRC="keys/br/c.png" ALT="[C]" HEIGHT="40" WIDTH="40"> <STRONG>Turnaround/Disconnect</STRONG><BR>
+In SET-UP B, <SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">C</SPAN> select the turnaround/disconnect characters.
+Hold down <SPAN CLASS="keyname">SHIFT</SPAN> and press <SPAN CLASS="keyname">C</SPAN> to select the turnaround character. This
+character works in half-duplex communication with coded control turnaround
+(HDX B). The disconnect character indicates the end of communication.
+You must select the disconnect character enable SET-UP feature
+to use the disconnect character.</P>
+<P><IMG SRC="keys/br/d.png" ALT="[D]" HEIGHT="40" WIDTH="40"> <STRONG>Default</STRONG><BR>
+In any SET-UP display, <SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">D</SPAN> select the default SET-UP feature
+settings. Hold down <SPAN CLASS="keyname">SHIFT</SPAN> and press <SPAN CLASS="keyname">D</SPAN> to select the default SET-UP feature
+setting. Each SET-UP feature has a default feature setting. <A HREF="chapter3.html">Chapter 3</A>
+lists the actual default feature settings.</P>
+<P><IMG SRC="keys/br/m.png" ALT="[M]" HEIGHT="40" WIDTH="40"> <STRONG>Modem Control</STRONG><BR>
+In SET-UP B, <SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">M</SPAN> select the type of communication used. Hold
+down <SPAN CLASS="keyname">SHIFT</SPAN> and press <SPAN CLASS="keyname">M</SPAN> to select one of five types of communication.
+There are three types of full-duplex and two types of half-duplex communication.</P>
+<P><IMG SRC="keys/br/p.png" ALT="[P]" HEIGHT="40" WIDTH="40"> <STRONG>Data/Parity Bits</STRONG><BR>
+In SET-UP B, <SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">P</SPAN> select the data/parity bits feature for either the
+modem or printer interface. Hold down <SPAN CLASS="keyname">SHIFT</SPAN> and press <SPAN CLASS="keyname">P</SPAN> to change the
+number of data bits per character and type of parity selected.</P>
+<P><IMG SRC="keys/br/r.png" ALT="[R]" HEIGHT="40" WIDTH="40"> <STRONG>Recall</STRONG><BR>
+In any SET-UP display, <SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">R</SPAN> perform a SET-UP feature recall. Hold
+down <SPAN CLASS="keyname">SHIFT</SPAN> and press <SPAN CLASS="keyname">R</SPAN> to recall the SET-UP features stored in user
+memory.</P>
+<P><IMG SRC="keys/br/s.png" ALT="[S]" HEIGHT="40" WIDTH="40"> <STRONG>Store</STRONG><BR>
+In any SET-UP display, <SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">S</SPAN> perform a SET-UP feature store. Hold
+down <SPAN CLASS="keyname">SHIFT</SPAN> and press <SPAN CLASS="keyname">S</SPAN> to store the SET-UP features in operating memory
+into user memory.</P>
+<P><IMG SRC="keys/br/t.png" ALT="[T]" HEIGHT="40" WIDTH="40"> <STRONG>Tab Default</STRONG><BR>
+In SET-UP A, <SPAN CLASS="keyname">SHIFT</SPAN> and <SPAN CLASS="keyname">T</SPAN> select a tab default. Hold down <SPAN CLASS="keyname">SHIFT</SPAN> and
+press <SPAN CLASS="keyname">T</SPAN> to select a tab default. This clears all tab stops and sets a tab
+stop every eighth character position.</P>
+<H3 ID="S1.3.4">Keyboard Indicators</H3>
+<P>The following paragraphs describe the function of each indicator shown in
+<A HREF="figure1-9.html">Figure 1-9</A>.</P>
+<P><STRONG>ON LINE</STRONG><BR>
+This indicator is on when the terminal is on-line and can communicate with
+the computer. Either ON LINE or OFF LINE is on when power is on.</P>
+<P CLASS="note">NOTE: Depending on the type of communication selected, the terminal
+may not communicate with the computer until a communication line connection
+exists. See <A HREF="chapter6.html">Chapter 6</A> for more information about communication
+types.</P>
+<P><STRONG>OFF LINE</STRONG><BR>
+This indicator is on when the terminal is off-line and cannot communicate
+with the computer. When off-line, the terminal displays keyboard characters
+on the screen. Either ON LINE or OFF LINE is on when the power is
+on.</P>
+<P><STRONG>KBD LOCKED</STRONG><BR>
+This indicator is on during a keyboard locked condition. This means the
+keyboard character buffer is full and cannot accept more keyboard characters.
+The keyboard character buffer holds keyboard characters until the
+terminal transmits them to the computer (<A HREF="figure1-1.html">Figure 1-1</A>). If KBD LOCKED is
+on, keyboard characters are lost. If the keyclick SET-UP feature is on,
+keys will not generate keyclicks.</P>
+<P CLASS="note">NOTE: The terminal can receive characters from the computer during
+the keyboard locked condition.</P>
+<P>There are several causes for the keyboard locked condition (<A HREF="table1-1.html">Table 1-1</A>).
+Each cause has a method to clear the keyboard locked condition. When
+the condition clears, the terminal can transmit characters to the computer
+and the KBD LOCKED indicator goes off. If the keyclick SET-UP feature is
+on, keys will generate keyclicks.</P>
+<P><STRONG>CTS</STRONG><BR>
+This indicator shows the on and off condition of the clear to send (CTS) or
+secondary clear to send (SCTS) modem connector signals. The internal
+communication switches select the connector signal used. See <A HREF="chapter6.html">Chapter 6</A>
+for more information about the communication signals and internal communication
+switches.</P>
+<P CLASS="note">NOTE: If the 20 mA current loop option (VT1XX-CA) is installed, the CTS
+signal is not used.</P>
+<P><STRONG>DSR</STRONG><BR>
+This indicator shows the on and off state of the data set ready (DSR)
+modem connector signal. This signal is on when the local modem (connected
+to the terminal) is ready to communicate. If the signal is off, the
+modem cannot communicate.</P>
+<P CLASS="note">NOTE: If the 20 mA current loop option (VT1XX-CA) is installed, the DSR
+signal is not used.</P>
+<P><STRONG>INSERT</STRONG><BR>
+This indicator shows when the terminal is in insert or replace mode. The
+computer selects these modes. In insert mode, INSERT is on. The terminal
+inserts new characters at the cursor position. Characters displayed to
+the right of the cursor move to the right. Characters moved past the right
+margin are lost.</P>
+<P>In replace mode, INSERT is off. The terminal writes new characters over
+the current display characters at the cursor position.</P>
+<P><STRONG>L1</STRONG><BR>
+This indicator is turned on and off by the computer. Therefore, the application
+software defines the meaning of L1.</P>
+<H3 ID="S1.3.5">Audible Indicators</H3>
+<P>There are three audible indicators: a keyclick, a bell tone, and a series of
+bell tones. The following paragraphs describe these indicators.</P>
+<H4 ID="S1.3.5.1">Keyclick</H4>
+<P>A keyclick sounds when you press a key, with the following
+exceptions.</P>
+<UL>
+<LI>You press <SPAN CLASS="keyname">SHIFT</SPAN> or <SPAN CLASS="keyname">CTRL</SPAN>. These keys do not generate a keyclick
+because they do not generate characters. They modify the characters
+generated by other keys.</LI>
+<LI>KBD LOCKED is on; characters from the keyboard are lost.</LI>
+<LI>The keyclick SET-UP feature is off.</LI>
+</UL>
+<H4 ID="S1.3.5.2">Bell Tone</H4>
+<P>A bell tone sounds in each of the following cases.</P>
+<UL>
+<LI>The terminal receives a bell character from the computer.</LI>
+<LI>The cursor is eight characters away from the right margin and the
+margin SET-UP feature is on.</LI>
+</UL>
+<H4 ID="S1.3.5.3">Series of Bell Tones</H4>
+<P>A series of bell tones sounds to indicate a problem
+in storing or recalling the SET-UP features in user memory. If the terminal
+has a problem, it automatically uses the default SET-UP feature selections.
+See <A HREF="chapter3.html">Chapter 3</A> for more information about the SET-UP feature memories.</P>
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