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TN3270 terminal emulation software allows any terminal to be used as an IBM 3270-type terminal. Use the commands in this chapter to configure IBM 3270 terminal emulation on your router. For configuration information and examples, refer to the chapter "Configuring TN3270" in this publication. For information about establishing TN3270 connections, refer to the Cisco Access Connection Guide.
To define specific characteristics of keyboard mappings, use the keymap global configuration command. To remove the named keymap from the current image of the configuration file, use the no form of this command.
keymap keymap-name keymap-entry| keymap-name | Name of the file containing the keyboard mappings. The name can be up to 32 characters long and must be unique. |
| keymap-entry | Commands that define the keymap. |
VT100 keyboard emulation
Global configuration
The keymap command maps individual keys on a non-3270 keyboard to perform the function defined for the 3270 keyboard. Use the EXEC command show keymap to test for the availability of a keymap.
The guidelines for creating a keymap file follow.
A keymap consists of an entry for a keyboard. The first part of an entry lists the names of the keyboards that use that entry. These names will often be the same as in the ttycaps file; however, often the terminals from various ttycap entries will all use the same keymap entry. For example, both 925 and 925vb (for 925 with visual bells) would probably use the same keymap entry. Additionally, there are occasions when it is necessary to specify a keyboard name as the name of the entry (for example, if a user requires a custom key layout).
After the names, which are separated by vertical bars (|), comes a left brace ({), the text that forms the definitions, and a right brace (}). Each definition consists of a reserved keyword, which identifies the 3270 function, followed by an equal sign (=), followed by the various ways to generate this particular function, followed by a semicolon (;). Each alternative way to generate the function is a sequence of ASCII characters enclosed inside single quotes ("); the alternatives are separated by vertical bars (|). Inside the single quotes, a few characters are special. A caret (^) specifies that the next character is a control (Ctrl) character. The two-character string caret symbol-a (^a) represents Ctrl-a. The caret symbol-A sequence (^A) generates the same code as caret symbol-a (^a). To generate Delete (or DEL), enter the caret symbol-question mark (^?) sequence.
In addition to the caret, a letter might be preceded by a backslash (\). Because this has little effect for most characters, its use is usually not recommended. In the case of a single quote ('), the backslash prevents that single quote from terminating the string. In the case of a caret (^), the backslash prevents the caret from having its special meaning. To have the backslash be part of the string, it is necessary to place two backslashes (\\) in the keymap. Table 9-1 lists other supported special characters.
| Character | Description |
|---|---|
| \E | Escape character |
| \n | Newline |
| \t | Tab |
| \r | Carriage return |
It is not necessary for each character in a string to be enclosed within single quotes. For example, \E\E\E means three escape characters.
To enter a keymap, provide a unique name for it and explicitly define all special keys you intend to include in it within curly brackets. Also, except for the last line, each line must be terminated with a backslash symbol (\). The last line ends with a right brace (}) symbol and an end-of-line character.
When emulating IBM-style 3270 terminals, a mapping must be performed between sequences of keys pressed at a user's (ASCII) keyboard and the keys available on a 3270-type keyboard. For example, a 3270-type keyboard has a key labeled EEOF that erases the contents of the current field from the location of the cursor to the end. To accomplish this function, the terminal user and a program emulating a 3270-type keyboard must agree on what keys will be typed to invoke the function. The requirements for these sequences follow:
Following are examples of acceptable keymap entries:
pfk1 = '\E1'; pfk2 = '\E2';
Following are examples of unacceptable keymap entries:
pfk1 = '\E1'; pfk11 = '\E11';
In the acceptable example, the keymap entry for pfk1 is not completely included in the keymap entry for pfk2. By contrast, in the unacceptable, or conflicting keymap pair, the sequence used to represent pfk1 is a complete subset of the sequence used to represent pfk11. Refer to the keymap entry provided later in this section for an example of how various keys can be represented to avoid this kind of conflict.
Table 9-2 is the list of 3270 key names that are supported in this keymap. Note that some of the keys do not really exist on a 3270-type keyboard. An unsupported function will cause the router to send a (possibly visual) bell sequence to the user's terminal.
| 3270 Key Name | Functional Description |
|---|---|
| LPRT1 | Local print |
| DP | Dup character |
| FM | Field mark character |
| CURSEL | Cursor select |
| CENTSIGN | EBCDIC cent sign |
| RESHOW | Redisplay the screen |
| EINP | Erase input |
| EEOF | Erase end of field |
| DELETE | Delete character |
| INSRT | Toggle insert mode |
| TAB | Field tab |
| BTAB | Field back tab |
| COLTAB | Column tab |
| COLBAK | Column back tab |
| INDENT | Indent one tab stop |
| UNDENT | Unindent one tab stop |
| NL | New line |
| HOME | Home the cursor |
| UP | Up cursor |
| DOWN | Down cursor |
| RIGHT | Right cursor |
| LEFT | Left cursor |
| SETTAB | Set a column tab |
| DELTAB | Delete a column tab |
| SETMRG | Set left margin |
| SETHOM | Set home position |
| CLRTAB | Clear all column tabs |
| APLON1 | Apl on |
| APLOFF1 | Apl off |
| APLEND1 | Treat input as ASCII |
| PCON1 | Xon/xoff on |
| PCOFF1 | Xon/xoff off |
| DISC | Disconnect (suspend) |
| INIT1 | New terminal type |
| ALTK1 | Alternate keyboard dvorak |
| FLINP | Flush input |
| ERASE | Erase last character |
| WERASE | Erase last word |
| FERASE | Erase field |
| SYNCH | We are in synch with the user |
| RESET | Reset key, unlock keyboard |
| MASTER_RESET | Reset, unlock, and redisplay |
| XOFF1 | Please hold output |
| XON1 | Please give me output |
| WORDTAB | Tab to beginning of next word |
| WORDBACKTAB | Tab to beginning of current/last word |
| WORDEND | Tab to end of current/next word |
| FIELDEND | Tab to last nonblank of current/next unprotected (writable) field |
| PA1 | Program attention 1 |
| PA2 | Program attention 2 |
| PA3 | Program attention 3 |
| CLEAR | Local clear of the 3270 screen |
| TREQ | Test request |
| ENTER | Enter key |
| PFK1 to PFK30 | Program function key 1 to program function key 30 |
Table 9-3 describes the proper keys used to emulate each 3270 function when using the default key mapping supplied.
| Command Keys | IBM 3270 Key | Default Keys |
|---|---|---|
| Cursor Movement Keys | New Line
Tab Back Tab Back Tab Cursor Left Cursor Right Cursor Up Cursor Down | Ctrl-n or Home
Ctrl-i Ctrl-b Ctrl-b Ctrl-h Ctrl-l Ctrl-k Ctrl-j or LINE FEED |
| Edit Control Keys | Delete Char
Erase EOF Erase Input Insert Mode End Insert | Ctrl-d or RUB
Ctrl-e Ctrl-w ESC Space1 ESC Space |
| Program Function Keys | PF1
PF2 ... PF10 PF11 PF12 PF13 PF14 ... PF24 | ESC 1
ESC 2 ... ESC 0 ESC - ESC = ESC ! ESC @ ... ESC + |
| Program Attention Keys | PA1
PA2 PA3 | Ctrl-p 1
Ctrl-p 2 Ctrl-p 3 |
| Local Control Keys | Reset After Error
Purge Input Buffer Keyboard Unlock Redisplay Screen | Ctrl-r
Ctrl-x Ctrl-t Ctrl-v |
| Other Keys | Enter
Clear Erase current field | Return
Ctrl-z Ctrl-u |
The following example is the default entry used by the TN3270 emulation software when it is unable to locate a valid keymap in the active configuration image. Table 9-2 lists the key names supported by the default Cisco TN3270 keymap.
ciscodefault{
clear = '^z';\
flinp = '^x';\
enter = '^m';\
delete = '^d' | '^?';\
synch = '^r';\
reshow = '^v';\
eeof = '^e';\
tab = '^i';\
btab = '^b';\
nl = '^n';\
left = '^h';\
right = '^l';\
up = '^k';\
down = '^j';\
einp = '^w';\
reset = '^t';\
ferase = '^u';\
insrt = '\E ';\
pa1 = '^p1'; pa2 = '^p2'; pa3 = '^p3';\
pfk1 = '\E1'; pfk2 = '\E2'; pfk3 = '\E3'; pfk4 = '\E4';\
pfk5 = '\E5'; pfk6 = '\E6'; pfk7 = '\E7'; pfk8 = '\E8';\
pfk9 = '\E9'; pfk10 = '\E0'; pfk11 = '\E-'; pfk12 = '\E=';\
pfk13 = '\E!'; pfk14 = '\E@'; pfk15 = '\E#'; pfk16 = '\E$';\
pfk17 = '\E%'; pfk18 = '\E'; pfk19 = '\E&'; pfk20 = '\E*';\
pfk21 = '\E('; pfk22 = '\E)'; pfk23 = '\E_'; pfk24 = '\E+';\
}
keymap-type
show keymap
terminal-type
To specify the keyboard map for a terminal connected to the line, use the keymap-type line configuration command. To reset the keyboard type for the line to the default, use the no form of this command.
keymap-type keymap-name| keymap-name | Name of a keymap defined within the configuration file of the router. The TN3270 terminal-type negotiations use the specified keymap type when setting up a connection with the remote host. |
VT100
Line configuration
The keymap-type command must follow the corresponding keymap global configuration entry in the configuration file.
Setting the keyboard to a different keymap requires that a keymap be defined with the router's configuration either by obtaining a configuration file over the network that includes the keymap definition or by defining the keyboard mapping using the global configuration command keymap.
Use the EXEC command show keymap to test for the availability of a keymap.
The following example sets the keyboard mapping to a keymap named vt100map:
line 3 keymap-type vt100map
Use the show keymap EXEC command to test for the availability of a keymap after a connection on a router takes place.
show keymap [keymap-name | all]| keymap-name | (Optional) Name of the keymap. |
| all | (Optional) Lists the names of all defined keymaps. The name of the default keymap is not listed. |
EXEC
The router searches for the specified keymap in its active configuration image and lists the complete entry if found. If the keymap is not found, an appropriate "not found" message appear.
If you do not use any arguments with the show keymap command, then the keymap currently used for the terminal is displayed.
The following is sample output from the show keymap command:
Router# show keymap
ciscodefault { clear = '^z'; flinp = '^x'; enter = '^m';\
delete = '^d' | '^?';\
synch = '^r'; reshow = '^v'; eeof = '^e'; tab = '^i';\
btab = '^b'; nl = '^n'; left = '^h'; right = '^l';\
up = '^k'; down = '^j'; einp = '^w'; reset = '^t';\
xoff = '^s'; xon = '^q'; escape = '^c'; ferase = '^u';\
insrt = '\E ';\
pa1 = '^p1'; pa2 = '^p2'; pa3 = '^p3';\
pfk1 = '\E1'; pfk2 = '\E2'; pfk3 = '\E3'; pfk4 = '\E4';\
pfk5 = '\E5'; pfk6 = '\E6'; pfk7 = '\E7'; pfk8 = '\E8';\
pfk9 = '\E9'; pfk10 = '\E0'; pfk11 = '\E-'; pfk12 = '\E=';\
pfk13 = '\E!'; pfk14 = '\E@'; pfk15 = '\E#'; pfk16 = '\E$';\
pfk17 = '\E%'; pfk18 = '\E\^'; pfk19 = '\E&'; pfk20 = '\E*';\
pfk21 = '\E('; pfk22 = '\E)'; pfk23 = '\E_'; pfk24 = '\E+';\
}
To determine ASCII-hexadecimal character mappings, use the show tn3270 ascii-hexval EXEC command.
show tn3270 ascii-hexvalThis command has no arguments or keywords.
EXEC
Use the show tn3270 ascii-hexval command to display the hexadecimal value of a character on your keyboard. After entering the show tn3270 ascii-hexval command, you are prompted to press a key. The hexadecimal value of the ASCII character is displayed. This command is useful for users who do not know the ASCII codes associated with various keys or do not have manuals for their terminals.
The following are sample output from the show tn3270 ascii-hexval command:
chaff>show tn3270 ascii-hexvalPress key> 7 - hexadecimal value is 0x37. chaff>show tn3270 ascii-hexvalPress key> f - hexadecimal value is 0x66. tarmac>show tn3270 ascii-hexvalPress key> not printable - hexadecimal value is 0xD.
tn3270 character-map
show tn3270 character-map
To display ASCII to EBCDIC character mappings, use the show tn3270 character-map EXEC command.
show tn3270 character-map {all | ebcdic-in-hex}| all | Displays all nonstandard character mappings. |
| ebcdic-in-hex | EBCDIC character whose ASCII mapping you want to display. |
EXEC
The following is sample output of the show tn3270 character map command with the all keyword:
tarmac# show tn3270 character-map all
EBCDIC 0x81 <=> 0x78 ASCII
EBCDIC 0x82 <=> 0x79 ASCII
EBCDIC 0x83 <=> 0x7A ASCII
tn3270 character-map
show tn3270 ascii-hexval
To test for the availability of a ttycap after a connection on a router takes place, use the show ttycap EXEC command.
show ttycap [ttycap-name | all]| ttycap-name | (Optional) Name of a ttycap. |
| all | (Optional) Lists the names of all defined ttycaps. The name of the default keymap is not listed. |
EXEC
The router searches for the specified ttycap in its active configuration image, and lists the complete entry if found. If it is not found, an appropriate "not found" message appear.
If you do not include any arguments with the show ttycap command, then the current keymap used for the terminal is displayed.
The following sample output from the show ttycap command displays current output for the current keymap used by the terminal:
Router# show ttycap
d0|vt100|vt100-am|vt100am|dec vt100:do=^J:co#80:li#24:\
cl=50^[[;H^[[2J:bs:am:cm=5^[[%i%d;%dH:nd=2^[[C:up=2^[[A:\
ce=3^[[K:so=2^[[7m:se=2^[[m:us=2^[[4m:ue=2^[[m:md=2^[[1m:\
me=2^[[m:ho=^[[H:xn:sc=^[7:rc=^[8:cs=^[[%i%d;%dr:
The following sample output from the show ttycap all command displays current output for all the keymaps:
Router# show ttycap all
ttycap3 d0|vt100|vt100-am|vt100am|dec vt100
ttycap2 dl|vt200|vt220|vt200-js|vt220-js|dec vt200 series with jump scroll
ttycap1 ku|h19-u|h19u|heathkit with underscore cursor
The following sample output from the show ttycap ttycap1 command displays current output for the ttycap1:
Router# show ttycap ttycap1
ttycap1 ku|h19-u|h19u|heathkit with underscore cursor:\:vs@:ve@:tc=h19-b:\
:al=1*\EL:am:le=^H:bs:cd=\EJ:ce=\EK:cl=\EE:cm=\EY%+ %+\
:co#80:dc=\EN:\:dl=1*\EM:do=\EB:ei=\EO:ho=\EH\
:im=\E@:li#24:mi:nd=\EC:as=\EF:ae=\EG:\
:ms:pt:sr=\EI:se=\Eq:so=\Ep:up=\EA:vs=\Ex4:ve=\Ey4:\
:kb=^h:ku=\EA:kd=\EB:kl=\ED:kr=\EC:kh=\EH:kn#8:ke=\E>:ks=\E=:\
:k1=\ES:k2=\ET:k3=\EU:k4=\EV:k5=\EW:\
:l6=blue:l7=red:l8=white:k6=\EP:k7=\EQ:k8=\ER:\
:es:hs:ts=\Ej\Ex5\Ex1\EY8%+ \Eo:fs=\Ek\Ey5:ds=\Ey1:
To specify the type of terminal connected to the line, use the terminal-type line configuration command. To reset the terminal type for the line to the default, use the no form of this command.
terminal-type terminal-name| terminal-name | Name of a termcap defined within the configuration file. |
VT100
Line configuration
The terminal-type command must follow the corresponding ttycap global configuration entry in the configuration file. Use the EXEC command show ttycap to test for the availability of a ttycap.
The TN3270 terminal-type negotiations use the specified terminal type when setting up a connection with the remote host.
Setting the terminal type to VT220 requires that the ttycap be defined within the router's configuration either by obtaining a configuration file over the network that includes the ttycap definition, or by defining the ttycap mapping via the global configuration command ttycap.
The following example sets the terminal line 5 to type VT220:
line 5 terminal-type VT220
To configure the communication server to use the mask set by the data-character-bits {7 | 8} line configuration command or the terminal data-character bits {7 | 8} EXEC command, use the tn3270 8bit display line configuration command. To restore the default 7-bit mask used for TN3270 connections, use the no form of this command.
tn3270 8bit displayThis command has no arguments or keywords.
Disabled
Line configuration
Use the tn3270 character-map command to map between extended EBCDIC or extended ASCII characters.
The following example configures the communication server to use the mask set by the data-character-bits line configuration and EXEC commands on line 5:
line 5 tn3270 8bit display
A dagger (+) indicates that the command is documented in the Router Products Command Reference publication. Two daggers (++) indicate that the command is documented in the Cisco Access Connection Guide.
data-character-bits+
terminal data-character-bits++
To configure the router to use an 8-bit mask, use the tn3270 8bit transparent-mode command. The no form of this command reverts to the default 7-bit mask used for TN3270 connections.
tn3270 8bit transparent-modeThis command has no arguments or keywords.
Disabled
Line configuration
This command is needed if you are using a file transfer protocol such as Kermit in 8-bit mode or you are using 8-bit graphics, both of which rely on transparent mode.
The following example configures the router to use the mask set by the data-character-bits line configuration and EXEC commands on line 5:
line 5 tn3270 8bit transparent-mode
A dagger (+) indicates that the command is documented in the Router Products Command Reference publication. Two daggers (++) indicate that the command is documented in the Cisco Access Connection Guide.
data-character-bits +
terminal data-character-bits ++
To create a two-way binding between EBCDIC and ASCII characters, use the tn3270 character-map global configuration command. To restore default character mappings, use the no form of this command.
tn3270 character-map ebcdic-in-hex ascii-in-hex| ebcdic-in-hex | Hexadecimal value of an EBCDIC character. |
| ascii-in-hex | Hexadecimal value of an ASCII character. |
| all | Indicates all character mappings. |
Disabled
Global configuration
Use this command to print EBCDIC international characters that are not normally printed, including umlauts (¨) and tildes (~). The command first restores default mapping for both EBCDIC and ASCII characters. In the no form of the command, the all keyword resets all character mappings to Cisco defaults.
Table 9-4 shows the default ASCII and EBCDIC character mappings, in decimal and hexadecimal format.
| Character | ASCII Decimal | ASCII Hexadecimal | EBCDIC Decimal | EBCDIC Hexadecimal |
|---|---|---|---|---|
| ! | 33 | 0x21 | 90 | 0x5a |
| " | 34 | 0x22 | 127 | 0x7f |
| # | 35 | 0x23 | 123 | 0x7b |
| $ | 36 | 0x24 | 91 | 0x5b |
| % | 37 | 0x25 | 108 | 0x6c |
| & | 38 | 0x26 | 80 | 0x50 |
| ' | 39 | 0x27 | 125 | 0x7d |
| ( | 40 | 0x28 | 77 | 0x4d |
| ) | 41 | 0x29 | 93 | 0x5d |
| * | 42 | 0x2a | 92 | 0x5c |
| + | 43 | 0x2b | 78 | 0x4e |
| , | 44 | 0x2c | 107 | 0x6b |
| - | 45 | 0x2d | 96 | 0x60 |
| . | 46 | 0x2e | 75 | 0x4b |
| / | 47 | 0x2f | 97 | 0x61 |
| 0 | 48 | 0x30 | 240 | 0xf0 |
| 1 | 49 | 0x31 | 241 | 0xf1 |
| 2 | 50 | 0x32 | 242 | 0xf2 |
| 3 | 51 | 0x33 | 243 | 0xf3 |
| 4 | 52 | 0x34 | 244 | 0xf4 |
| 5 | 53 | 0x35 | 245 | 0xf5 |
| 6 | 54 | 0x36 | 246 | 0xf6 |
| 7 | 55 | 0x37 | 247 | 0xf7 |
| 8 | 56 | 0x38 | 248 | 0xf8 |
| 9 | 57 | 0x39 | 249 | 0xf9 |
| : | 58 | 0x3a | 122 | 0x7a |
| ; | 59 | 0x3b | 94 | 0x5e |
| < | 60 | 0x3c | 76 | 0x4c |
| = | 61 | 0x3d | 126 | 0x7e |
| > | 62 | 0x3e | 110 | 0x6e |
| ? | 63 | 0x3f | 111 | 0x6f |
| @ | 64 | 0x40 | 124 | 0x7c |
| A | 65 | 0x41 | 193 | 0xc1 |
| B | 66 | 0x42 | 194 | 0xc2 |
| C | 67 | 0x43 | 195 | 0xc3 |
| D | 68 | 0x44 | 196 | 0xc4 |
| E | 69 | 0x45 | 197 | 0xc5 |
| F | 70 | 0x46 | 198 | 0xc6 |
| G | 71 | 0x47 | 199 | 0xc7 |
| H | 72 | 0x48 | 200 | 0xc8 |
| I | 73 | 0x49 | 201 | 0xc9 |
| J | 74 | 0x4a | 209 | 0xd1 |
| K | 75 | 0x4b | 210 | 0xd2 |
| L | 76 | 0x4c | 211 | 0xd3 |
| M | 77 | 0x4d | 212 | 0xd4 |
| N | 78 | 0x4e | 213 | 0xd5 |
| O | 79 | 0x4f | 214 | 0xd6 |
| P | 80 | 0x50 | 215 | 0xd7 |
| Q | 81 | 0x51 | 216 | 0xd8 |
| R | 82 | 0x52 | 217 | 0xd9 |
| S | 83 | 0x53 | 226 | 0xe2 |
| T | 84 | 0x54 | 227 | 0xe3 |
| U | 85 | 0x55 | 228 | 0xe4 |
| V | 86 | 0x56 | 229 | 0xe5 |
| W | 87 | 0x57 | 230 | 0xe6 |
| X | 88 | 0x58 | 231 | 0xe7 |
| Y | 89 | 0x59 | 232 | 0xe8 |
| Z | 90 | 0x5a | 233 | 0xe9 |
| [ | 91 | 0x5b | 173 | 0xad |
| \ | 92 | 0x5c | 224 | 0xe0 |
| ] | 93 | 0x5d | 189 | 0xbd |
| ^ | 94 | 0x5e | 95 | 0x5f |
| _ | 95 | 0x5f | 109 | 0x6d |
| ` | 96 | 0x60 | 121 | 0x79 |
| a | 97 | 0x61 | 129 | 0x81 |
| b | 98 | 0x62 | 130 | 0x82 |
| c | 99 | 0x63 | 131 | 0x83 |
| d | 100 | 0x64 | 132 | 0x84 |
| e | 101 | 0x65 | 133 | 0x85 |
| f | 102 | 0x66 | 134 | 0x86 |
| g | 103 | 0x67 | 135 | 0x87 |
| h | 104 | 0x68 | 136 | 0x88 |
| i | 105 | 0x69 | 137 | 0x89 |
| j | 106 | 0x6a | 145 | 0x91 |
| k | 107 | 0x6b | 146 | 0x92 |
| l | 108 | 0x6c | 147 | 0x93 |
| m | 109 | 0x6d | 148 | 0x94 |
| n | 110 | 0x6e | 149 | 0x95 |
| o | 111 | 0x6f | 150 | 0x96 |
| p | 112 | 0x70 | 151 | 0x97 |
| q | 113 | 0x71 | 152 | 0x98 |
| r | 114 | 0x72 | 153 | 0x99 |
| s | 115 | 0x73 | 162 | 0xa2 |
| t | 116 | 0x74 | 163 | 0xa3 |
| u | 117 | 0x75 | 164 | 0xa4 |
| v | 118 | 0x76 | 165 | 0xa5 |
| w | 119 | 0x77 | 166 | 0xa6 |
| x | 120 | 0x78 | 167 | 0xa7 |
| y | 121 | 0x79 | 168 | 0xa8 |
| z | 122 | 0x7a | 169 | 0xa9 |
| { | 123 | 0x7b | 192 | 0xc0 |
| | | 124 | 0x7c | 79 | 0x4f |
| } | 125 | 0x7d | 208 | 0xd0 |
| ~ | 126 | 0x7e | 161 | 0xa1 |
The following example creates a two-way binding between an EBCDIC character and an ASCII character:
tn3270 character-map 0x81 0x78
show tn3270 character-map
show tn3270 ascii-hexval
To permit the use of extended features, use the tn3270 datastream line configuration command. Use the no form of this command to restore the default setting of support for normal features.
tn3270 datastream {extended | normal}| extended | Appends "-E" to the terminal type string sent to the IBM host. |
| normal | Restores the default for support of normal features. |
Normal
Line configuration
Use the tn3270 datastream command to allow the use of extended features over routers that support such features.
The following example configures the router to add "-E" to the terminal type string sent to the IBM host:
line 5 tn3270 datastream extended
To specify the processing of null characters on a terminal screen, use the tn3270 null-processing line configuration command. Use the no form of this command to restore the default of improved null-character processing.
tn3270 null-processing {3270 | improved}| 3270 | Emulating a 3278x terminal, specifies the compression of null characters out of strings. |
| improved | Emulating a 7171 controller, specifies the conversion of null characters into spaces. |
Improved
Line configuration
If a user enters data at a terminal keyboard, then uses an arrow key to move the cursor across the display screen and enters more data, the blanks spaces are filled with nulls.
Use this command to manage the processing of null characters on the terminal screen. If you use the 3270 parameter, all null characters are compressed out of the character string. The improved parameter converts all null characters to spaces.
The following example configures the router to convert null characters to spaces:
line 5 tn3270 null-processing improved
To specify the locking of the user's keyboard until the Reset key is pressed, use the tn3270 reset-required line configuration command. Use the no form of this command to restore the default setting so that pressing the Reset key is not required.
tn3270 reset-requiredThis command has no arguments or keywords.
Disabled
Line configuration
Use this command to emulate the behavior of the 3278x terminal, on which the keyboard is locked and further input is denied until the Reset key is pressed. The majority of 3270 terminal emulations leave the keyboard unlocked and remove any error message at the next keystroke.
The following example configures the router to lock the user's keyboard until the Reset key is press:
line 5 tn3270 reset-required
To define characteristics of a terminal emulation file, use the ttycap global configuration command. To delete any named ttycap entry from the configuration file, use the no form of this command.
ttycap ttycap-name termcap-entry| termcap-name | Name of a file. It can be up to 32 characters long and must be unique. |
| termcap-entry | Commands that define the ttycap. Consists of two parts (see "Usage Guidelines" for details). |
VT100 terminal emulation
Global configuration
Use the EXEC command show ttycap to test for the availability of a ttycap.
The termcap-entry consists of two parts: a name portion and a capabilities portion.
The name portion is a series of names that can be used to refer to a specific terminal type. Generally, these names should represent commonly recognized terminal names (such as VT100 and VT200). Multiple names can be used. Each name is separated by a vertical bar symbol (|). The series is terminated by a colon symbol ( : ).
The following example illustrates a name specification for a VT100 termcap.
d0|vt100|vt100-am|vt100am|dec vt100:
The capabilities portion of the termcap-entry consists of a sequence of termcap capabilities. These capabilities can include boolean flags, string sequences, or numeric sequences. Each individual capability is terminated using a colon symbol ( : ).
A Boolean flag can be set to true by including the two-character capability name in the termcap entry. The absence of any supported flag results in the flag being set to false.
The following is an example of a backspace Boolean flag:
bs:
A string sequence is a two-character capability name followed by an equal sign (=) and the character sequence.
The following example illustrates the capability for homing the cursor:
ho=\E[H:
The sequence \E represents the ESC character.
Control characters can be represented in string sequences by entering a two-character sequence starting with a caret symbol (^), followed by the character to be used as a control character.
The following example illustrates the definition of a control character:
bc=^h:
In this example, the backspace is entered into the termcap-entry as the string sequence as the characters "^h."
A numeric sequence is a two-character capability name followed by an number symbol (#) and the number.
The following example represents the number of columns on a screen:
co#80:
Use the backslash symbol ( \ ) to extend the definition to multiple lines. The end of the ttycap termcap-entry is specified by a colon terminating a line followed by an end-of-line character and no backslash.
For the definitions of supported Boolean-flag ttycap capabilities, see Table 9-5. For the definitions of supported string-sequence ttycap capabilities, see Table 9-6. For the definitions of supported number-sequence ttycap capabilities, see Table 9-7.
| Boolean Flag | Description |
|---|---|
| am | Automatic margin |
| bs | Terminal can backspace with bs |
| ms | Safe to move in standout modes |
| nc | No currently working carriage return |
| xn | NEWLINE ignored after 80 cols (Concept) |
| xs | Standout not erased by overwriting (Hewlett-Packard) |
| String Sequence | Description |
|---|---|
| AL | Add line below with cursor sequence |
| bc | Backspace if not ^h |
| bt | Backtab sequence |
| ce | Clear to end of line |
| cl | Clear screen, cursor to upper left |
| cm | Move cursor to row # and col # |
| cr | Carriage return sequence |
| cs | Change scrolling region |
| DL | Delete the line the cursor is on |
| ei | End insert mode |
| ho | Home, move cursor to upper left |
| ic | Character insert |
| im | Begin insert mode |
| is | Initialization string (typically tab stop initialization) |
| ll | Move cursor to lower left corner |
| md | Turn on bold (extra bright) character attribute |
| me | Turn off all character attributes |
| nd | Nondestructive space |
| nl | Newline sequence |
| pc | Pad character if not NULL |
| rc | Restore cursor position |
| rs | Resets terminal to known starting state |
| sc | Save cursor position |
| se | End standout mode (highlight) |
| so | Start standout mode (highlight) |
| ta | Tab |
| te | End programs that use cursor motion |
| ti | Initialization for programs that use cursor motion |
| uc | Underline character at cursor |
| ue | End underline mode |
| up | Move cursor up |
| us | Begin underline mode |
| vb | Visual bell |
| vs | Visual cursor |
| ve | Normal cursor |
| Number Sequence | Description |
|---|---|
| li | Lines on the screen. |
| co | Columns on the screen. |
| sg | Standout glitch, number of spaces printed when entering or leaving standout display mode. |
| ug | Underline glitch, number of spaces printed when entering or leaving underline mode. |
The following is an example of a ttycap file. See the chapter "Configuring TN3270" earlier in this publication and the tn3270.examples file in the Cisco ftp.cisco.com directory for more examples.
ttycap ttycap1\ d0|vt100|vt100-am|vt100am|dec vt100:do=^J:co#80:li#24:\ cl=50^[[;H^[[2J:bs:am:cm=5^[[%i%d;%dH:nd=2^[[C:up=2^[[A:\ ce=3^[[K:so=2^[[7m:se=2^[[m:us=2^[[4m:ue=2^[[m:md=2^[[1m:\ me=2^[[m:ho=^[[H:xn:sc=^[7:rc=^[8:cs=^[[%i%d;%dr:
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