182 lines
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HTML
182 lines
12 KiB
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Configure Telnet server for VTxxx full-screen mode" />
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<meta name="abstract" content="VTxxx server support allows Telnet client users to log on and run iSeries 5250 full-screen applications, even though VTxxx full-screen support is negotiated." />
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<meta name="description" content="VTxxx server support allows Telnet client users to log on and run iSeries 5250 full-screen applications, even though VTxxx full-screen support is negotiated." />
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<meta name="DC.Relation" scheme="URI" content="rzaiwemultypes.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Configure Telnet server for VTxxx full-screen mode</title>
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</head>
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<body id="rzaiwmodevtxxx"><a name="rzaiwmodevtxxx"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Configure Telnet server for VTxxx full-screen mode</h1>
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<div><p>VTxxx server support allows Telnet client users to log on and run iSeries™ 5250
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full-screen applications, even though VTxxx full-screen support is negotiated.</p>
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<p>The Telnet client application must be able to negotiate VTxxx terminal
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support. When VTxxx full-screen mode is negotiated, the iSeries Telnet
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server is responsible for mapping 5250 functions to VTxxx keys and vice versa.</p>
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<p>Although the iSeries Telnet
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server supports VTxxx clients, this is not the preferred mode to use because
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the VTxxx terminal is a character-mode device. The iSeries server is a block-mode system.
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Most Telnet implementations support a TN3270 or TN5250 client that should
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be used when connecting to an iSeries Telnet server.</p>
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<p>In general, when a key on a VTxxx terminal is pressed, the hexadecimal
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code associated with that key immediately transmits to the Telnet server.
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The Telnet server must process that keystroke and then echo that character
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back to the VTxxx terminal where it is displayed. This results in a large
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amount of overhead associated with each keystroke. In contrast, the 5250 and
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3270 block mode devices buffer all keystrokes at the client system until an
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attention identifier (AID) key is pressed. When an AID key is pressed, the
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client sends the buffered input to the server for processing. The block-mode
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devices result in less overhead per keystroke and generally provide better
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performance than a character-mode device, such as the VTxxx terminal.</p>
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<p>VTxxx delivers the data between the two systems as ASCII.</p>
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<p>After you have completed the general configuration of the Telnet server,
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you need to complete a few additional steps to enable server support for VTxxx
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full-screen mode.</p>
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<p>Full-screen mode is a "block" mode as opposed to a "line" mode. "Line"
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mode is when data transmits one line at a time, while "block" or full-screen
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mode transmits the whole screen at one time.</p>
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<p>For VTxxx full screen considerations, emulation options, and key values,
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see <a href="rzaiwmanagevtxxx.htm">VTxxx Telnet client sessions</a>.</p>
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<p>Complete the following tasks to configure the server for VTxxx full-screen
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mode:</p>
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<ol><li><a href="#rzaiwmodevtxxx__SPTCTQSV">Check the QKBDTYPE system value</a></li>
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<li><a href="#rzaiwmodevtxxx__SPTSTDKM">Set the default keyboard map</a></li>
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<li><a href="#rzaiwmodevtxxx__SPTSTDV">Set the default network virtual terminal type</a></li>
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<li><a href="#rzaiwmodevtxxx__SPTSTAMT">Set the ASCII/EBCDIC mapping tables</a></li>
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</ol>
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<div class="section" id="rzaiwmodevtxxx__SPTCTQSV"><a name="rzaiwmodevtxxx__SPTCTQSV"><!-- --></a><h4 class="sectiontitle">Check the QKBDTYPE system value</h4><p>When
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the iSeries Telnet
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server automatically creates virtual display devices, it uses the QKBDTYPE
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system value to determine the keyboard type for the virtual device.</p>
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<p>If
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the initial creation of the virtual device fails using the QKBDTYPE system
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value, the Telnet server tries to create the device again, using a keyboard
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type value of USB. If the second attempt to create the keyboard type fails,
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then the system sends a message (CPF87D7) to the QTCPIP job log. This message
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indicates that the system cannot automatically create the virtual device.
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The system also sends the message to the system operator message queue.</p>
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</div>
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<div class="section" id="rzaiwmodevtxxx__SPTSTDKM"><a name="rzaiwmodevtxxx__SPTSTDKM"><!-- --></a><h4 class="sectiontitle">Set the default keyboard map</h4><p>When
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a Telnet session negotiates in VTxxx full-screen mode, the system uses a default
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keyboard map. To display the default keyboard map for VTxxx, use the Display
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VT Keyboard Map (DSPVTMAP) command. To change the VTxxx keyboard map, use
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the Change VT Keyboard Map (CHGVTMAP) command or the Set VT Keyboard Map (SETVTMAP)
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command. Refer to <a href="rzaiwspecoptvtxxx.htm">VTxxx emulation options</a> for information
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about working with the keyboard maps.</p>
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<p>To find the special VTxxx key
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values for 5250 function, refer to the <a href="rzaiwspecial.htm">VTxxx key values by 5250 function</a> table.</p>
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<p>The
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numeric keypad table shows the keys on the auxiliary keypad that normally
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transmit the codes for the numerals, decimal point, minus sign and comma.</p>
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<p>The
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editing keypad table shows the keys that transmit codes for the editing keypad
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keys.</p>
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<p>Because the VTxxx keyboard does not have the same keys as a 5250
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keyboard, a keyboard mapping must exist between the VTxxx keys and the iSeries functions.
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The iSeries server
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assigns a default keyboard mapping when a VTxxx session is first established.
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In some cases, there can be more than one key or key sequence that maps to
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a particular iSeries server
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function. In these cases, you can use any of the defined keys to call the
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required iSeries server
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function.</p>
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<div class="note"><span class="notetitle">Notes:</span> <ol><li>Each control character is a 1-byte value generated from a VTxxx keyboard
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by holding down the CTRL key while pressing one of the alphabetic keys. Both
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shifted and unshifted control characters generate the same hexadecimal values.</li>
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<li>The escape sequences are multiple byte codes that are generated by pressing
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the Esc key followed by the characters that make up the required sequence.</li>
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<li>The iSeries server
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ignores the case of all alphabetic characters in an escape sequence. You can
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type alphabetic characters in escape sequences in either uppercase or lowercase.</li>
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<li>The iSeries server
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F1-F12 functions are mapped to the Esc key followed by one of the keys in
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the top row of a VTxxx keyboard. The Esc key followed by a shifted key in
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the top row of a VTxxx keyboard maps the F13-F24 functions.</li>
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<li>Some Telnet VTxxx client systems use Ctrl-S and Ctrl-Q for flow control
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purposes. This is generally referred to as XON/XOFF flow control. If you are
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using a client system that has XON/XOFF enabled, you should not use the values
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*CTLS and *CTLQ in your keyboard mapping.</li>
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</ol>
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</div>
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</div>
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<div class="section" id="rzaiwmodevtxxx__SPTSTDV"><a name="rzaiwmodevtxxx__SPTSTDV"><!-- --></a><h4 class="sectiontitle">Set the default network virtual terminal type</h4><p>The
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default network virtual terminal type parameter specifies the mode to use
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when the Telnet server is not able to negotiate one of the supported terminal
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types.</p>
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<p>To set the value of the Default network virtual terminal to either
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*VT100 for VT100/VT220 mode, or *NVT for ASCII line mode, complete the following
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steps:</p>
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<ol><li>Start iSeries Navigator
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and expand <span class="menucascade"><span class="uicontrol">your iSeries server</span> > <span class="uicontrol">Network</span> > <span class="uicontrol">Servers</span> > <span class="uicontrol">TCP/IP</span></span>.</li>
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<li>Right-click <span class="uicontrol">TELNET</span> and select <span class="uicontrol">Properties</span>.</li>
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<li>Click the <span class="uicontrol">General</span> tab and select the appropriate
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value next to <span class="uicontrol">Default network virtual terminal</span>.</li>
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<li>Click <span class="uicontrol">OK</span>.</li>
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</ol>
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</div>
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<div class="section" id="rzaiwmodevtxxx__SPTSTAMT"><a name="rzaiwmodevtxxx__SPTSTAMT"><!-- --></a><h4 class="sectiontitle">Set the ASCII/EBCDIC mapping tables</h4><p>The iSeries Telnet
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server uses default ASCII-to-EBCDIC and EBCDIC-to-ASCII mapping tables based
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on the CCSID parameter in the TCP/IP Telnet attributes. The default is to
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use the DEC multinational character set (*MULTINAT). Other 7-bit and 8-bit
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ASCII CCSIDs, and any of the 7-bit DEC national replacement character sets
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are also acceptable to use.</p>
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<div class="note"><span class="notetitle">Note:</span> For VT220 8-bit mode, the mapping tables
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are not available. In this mode, the system uses the DEC replacement character
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sets. For the VT220 7-bit mode, you can use either the mapping tables or the
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DEC replacement character sets.</div>
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<p>There are three ways to change the
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default. You can change the CCSID parameter, specify different values for
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the VTxxx outgoing (TBLVTOUT) and incoming tables(TBLVTIN), or change the
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default tables for the current session.</p>
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<ul><li>To change the values for the tables, complete the following steps: <ol><li>Start iSeries Navigator
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and expand <span class="menucascade"><span class="uicontrol">your iSeries server</span> > <span class="uicontrol">Network</span> > <span class="uicontrol">Servers</span> > <span class="uicontrol">TCP/IP</span></span>.</li>
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<li>Right-click <span class="uicontrol">TELNET</span> and select <span class="uicontrol">Properties</span>.</li>
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<li>Click the <span class="uicontrol">Mappings</span> tab.</li>
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<li>Select the <span class="uicontrol">Use specified mapping tables</span> checkbox
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and click <span class="uicontrol">Tables</span>.</li>
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<li>Select the <span class="uicontrol">Use outgoing mapping table</span> and <span class="uicontrol">Use
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incoming mapping table</span> checkboxes to change the CCSID parameter.</li>
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<li>Click <span class="uicontrol">OK</span>.</li>
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<li>Click <span class="uicontrol">OK</span>.</li>
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</ol>
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</li>
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<li>To change the default tables for the current session, use the Set VT Mapping
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Tables (SETVTTBL) command.</li>
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</ul>
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<p>Another way to access this command is to use option 2 on the CHGTCPTELN
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command.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiwemultypes.htm" title="The preferred emulation for the iSeries is 5250 emulation. However, the iSeries also supports 3270 and VTxxx emulation.">iSeries supported emulation types</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzaiwtcnumkeypads.htm" title="This topic lists the keys on the auxiliary keypad that normally transmit the codes for the numerals, decimal point, minus sign, and comma.">Numeric keypad</a></div>
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<div><a href="rzaiwtceditingkeypad.htm" title="This table shows the keys that transmit codes for the editing keypad key.">Editing keypad</a></div>
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</div>
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</div>
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</body>
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</html>
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