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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 VT100 User Guide</TITLE><LINK HREF="vt100-ug.css" TYPE="text/css" REL="stylesheet"><LINK HREF="/favicon.ico" TYPE="image/x-icon" REL="shortcut icon"></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> VT100 User Guide<TABLE WIDTH="100%"><COL SPAN="3" WIDTH="33%"><TBODY><TR><TD ALIGN="LEFT"><A HREF="chapter3.html">Chapter 3</A></TD><TD ALIGN="CENTER"><A HREF="contents.html">Contents</A></TD><TD ALIGN="RIGHT"><A HREF="chapter5.html">Chapter 5</A></TD></TR></TBODY></TABLE><HR></DIV><H1 ID="S4">Chapter 4<BR>VT100 Options</H1><P>The VT100 has available options which are designed to enhance the basic terminaland allow its use in a wide range of applications. The options currently availableare:</P><UL><LI>VT1XX-AA 20 Current Loop Option</LI><LI>VT1XX-AB Advanced Video Option</LI></UL><P>In the future, additional options will be available which will further enhance thebasic VT100. Contact the nearest DIGITAL Sales Office for further information andhow to order the options.</P><H2 ID="S4.1">Advanced Video Option -- VT1XX-AB</H2><P>The Advanced Video Option enhances the basic VT100 by adding the followingfeatures:</P><UL><LI>10 additional lines of 132 column display -- this capability is added to theVT100 by providing additional display memory. The screen can now displaya total of 24 lines in either 80- or 132-column format.</LI><LI>Additional character attributes -- the VT100 is now capable of highlightingany character(s) on the screen in any of the following ways:<UL><LI>Bold</LI><LI>Blink</LI><LI>Underline</LI><LI>Reverse</LI><LI>Any combination of the above</LI></UL></LI><LI>Capability of an additional character generator ROM -- this capability isadded to the VT100 by providing the memory required to access a secondcharacter generator ROM.</LI></UL><H3 ID="S4.1.1">Advanced Video Option Installation</H3><P>Use the following procedure to install the Advanced Video Option.</P><OL><LI>Remove power from the terminal by disconnecting the ac plug.</LI><LI>Unplug the keyboard (<A HREF="figure4-1.html">Figure 4-1</A>).</LI><LI>Unplug any connectors from the composite video input/output jacks.</LI><LI>Disconnect the communications cable.</LI><LI>With a blade-type screwdriver loosen the four captive screws holding theaccess cover.</LI><LI>If the 20 mA Current Loop Option is installed, gently pull the accesscover away from the terminal about 2 inches; then reach in and disconnectJ5 from the terminal controller board.</LI><LI>Remove the access cover.</LI><LI>Remove any graphic or STP cables.</LI><LI>Remove the terminal controller board by gently but firmly pulling theboard straight out. The terminal controller board is located in the leftmostslot in the card cage (viewed from the rear).</LI><LI>Place the terminal controller board on a flat surface with the componentside up (<A HREF="figure4-2.html">Figure 4-2</A>).</LI><LI>Locate the four mounting holes drilled in the terminal controller board;mount a standoff in each.</LI><LI>Grasp the advanced video board by the edges and carefully align theconnector pins with the connector on the terminal controller board.Gently but firmly mount the advanced video board onto the terminalcontroller board.</LI><LI>Reinstall the terminal controller board. The terminal controller boardmust be inserted into the leftmost slot in the card cage.</LI><LI>Reinstall all cables removed.</LI><LI>Reinstall the access cover.</LI></OL><H3 ID="S4.1.2">Advanced Video Option Checkout</H3><P>Use the following procedure to check out the operation of the Advanced VideoOption.</P><OL><LI>Turn the terminal power on and verify that no error was detected duringthe power up self-test.</LI><LI>Press the <SPAN CLASS="keyname">SET-UP</SPAN> key. The words "SET-UP A" should blink in boldface,the words "TO EXIT PRESS SET-UP" should be underlined, and the rulershould contain alternating normal and reverse video fields.</LI><LI>Place the terminal in the 132-column mode and then in the LOCALmode.</LI><LI>Exit SET-UP and type the following sequence:<P><CODE>ESC < ESC # 8</CODE></P><P>The screen should now display 24 lines × 132 columns.</P></LI></OL><H2 ID="S4.2">20 mA Current Loop Option -- VT1XX-AA</H2><P>The 20 mA Current Loop Option allows the VT100 to connect directly to the hostcomputer over a short distance without using a modem. The specifications for the20 mA Current Loop Option are located in <A HREF="chapter2.html">Chapter 2</A> of this manual under interfaceinformation.</P><H3 ID="S4.2.1">20 mA Current Loop Option Installation</H3><P>Use the following procedure to install the 20 mA Current Loop Option:</P><OL><LI>Remove power from the terminal by disconnecting the ac plug.</LI><LI>Unplug the keyboard.</LI><LI>Unplug any connectors from the composite video input/output jacks.</LI><LI>Disconnect the communications cable.</LI><LI>With a blade-type screwdriver loosen the four captive screws holdingthe access cover; then remove the cover.</LI><LI>Set the TRANS switch to the NORMAL position (<A HREF="figure4-3.html">Figure 4-3</A>). (If theterminal must provide current on the receive line, set the switch to theACT position).</LI><LI>Set the REC switch to the NORMAL position (<A HREF="figure4-3.html">Figure 4-3</A>). (If the terminalmust provide current on the receive line set the switch to the ACTposition).</LI><LI>Connect P5 to J5 on the terminal controller board (<A HREF="figure4-4.html">Figure 4-4</A>).</LI><LI>Perform the 20 mA Current Loop Option Checkout.</LI></OL><H3 ID="S4.2.2">20 mA Current Loop Option Checkout</H3><P>The VT100 contains an internal test called the data loopback test. In the dataloopback test the VT100 transmit and receive lines are connected to each othervia a special external connector. A predefined set of characters are then transmitted.The terminal receives the characters and compares them to the characterstransmitted. If the characters do not match an error is then flagged.</P><P>Use the following procedure to check out the operation of the 20 mA Current LoopOption.</P><OL><LI>Disconnect the terminal from the communications line.</LI><LI>Remove the terminal access cover containing the 20 mA current loopboard; place both of the switches in the NORMAL position. Reinstallthe access cover.</LI><LI>Connect the 20 mA loopback connector (PN 70-15503-00) to theMate-N-Lok connector mounted to the bottom of the access cover.</LI><LI>Place the terminal in ANSI-compatible mode (in SET-UP B group 2switch 3 equals a 1).</LI><LI>Type the following sequence to perform the data loopback test.<P><CODE>ESC [ 2 ; 2 y</CODE></P><P>When the test is performed, the screen clears and the message "WAIT"is displayed in the upper left corner of the screen. The entire test takesapproximately six seconds to run.</P><P CLASS="note">NOTE: The data loopback test can be repeated indefinitely by typing <CODE>ESC [ 2; 10 y</CODE>.This test ends only when an error is detected or the terminal power is turned off.</P></LI><LI>A loopback error is shown by "8" being displayed in the upper leftcorner of the screen. If an error is detected, check the 20 mA boardconnectors and switch settings and then repeat Step 5. If the errorpersists, contact your service organization.</LI><LI>Once the test is complete return the 20 mA current loop boardswitches to the original positions, remove the loopback connector,replace the access cover, and reconnect the terminal tocommunications line.</LI></OL><H2 ID="S4.3">Communications Cables</H2><P>The communications cables available for use with the VT100 are listed in<A HREF="chapter5.html">Chapter 5</A>.</P><DIV CLASS="navbar"><HR><TABLE WIDTH="100%"><COL SPAN="3" WIDTH="33%"><TBODY><TR><TD ALIGN="LEFT"><A HREF="chapter3.html">Chapter 3</A></TD><TD ALIGN="CENTER"><A HREF="contents.html">Contents</A></TD><TD ALIGN="RIGHT"><A HREF="chapter5.html">Chapter 5</A></TD></TR></TBODY></TABLE><DIV CLASS="navbot">http://vt100.net/docs/vt100-ug/chapter4.html</DIV></DIV></BODY></HTML>⌨️ 快捷键说明
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