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VT connection settings

In addition to the Common connection settings, VT hosts require additional settings. These settings vary depending on the protocol you are using; Telnet or SSH. The settings are applicable to both protocols unless noted.

VT session configuration options

VT Settings Description
Terminal ID This setting determines the response that Host Access for the Cloud sends to the host after a primary device attributes (DA) request. This response lets the host know what terminal functions it can perform. The Host Access for the Cloud response for each Terminal ID is exactly the same as the VT terminal's response; some applications may require a specific DA response. This terminal ID setting is independent of the Terminal type setting. The options are: VT220, VT420, VT100, DEC-VT100, and VT52.
Allow unknown hosts (SSH) This setting provides the administrator with the ability to decide whether the web client will allow unknown hosts. Options are:
  • Yes - Unknown hosts and all SSH connections are permitted. Web client users are not prompted about whether hosts should be trusted.
  • Ask - The web client user is prompted whether the host should be trusted when they connect to an unknown host they haven't encountered before. If they choose to trust the host, then its public key is stored in their user preferences and subsequent connections will not elicit a prompt unless the host key changes.
  • No - No unknown hosts are permitted. Only those hosts the administrator chooses to trust when configuring the session are permitted. End users are never prompted and the session will either connect or not connect depending on the administrator’s choices.
Suppress banner messages (SSH) When enabled, the SSH banner is not displayed. This option is useful when recording SSH login macros.
Local Echo (Telnet) Automatic (default). How Host Access for the Cloud responds to remote echo from a Telnet host: Automatic attempts to negotiate remote echo, but does what the host commands. Yes means Host Access for the Cloud negotiates local echo with the host, but always echoes, while No means Host Access for the Cloud negotiates remote echo with the host, but does not echo.
Renegotiate Echo (Telnet) No (default). When set to Yes, passwords are not displayed on the local screen, but all other typed text is visible. Host Access for the Cloud supports the Telnet Suppress Local Echo (SLE) option when connected to a host in half-duplex mode. This means that Host Access for the Cloud will suppress character echo to the host computer, and with SLE support Host Access for the Cloud can be instructed to suppress echo locally.
Set Host Window Size Yes (default). This setting sends the number of rows and columns to the Telnet host whenever they change. This enables the Telnet host to properly control the cursor if the window size is changed.
Request Binary (Telnet) No (default). Telnet defines a 7-bit data path between the host and the terminal. This type of data path is not compatible with certain national character sets. Fortunately, many hosts allow for 8-bit data without zeroing the 8th bit, which resolves this problem. In some cases, however, it may be necessary to force the host to use an 8-bit data path by selecting this check box.
Send LF after CR (Telnet) No (default). A "true" Telnet host expects to see a CrNu (carriage return/null) character sequence to indicate the end of a line sent from a terminal. There are some hosts on the Internet that are not true Telnet hosts, and they expect to see a Lf (linefeed) character following the Cr at the end of a line. If you're connecting to this type of Telnet host, select Yes.
Ctrl-break sends (Telnet) Choose what sequence Ctrl-break sends to the host when pressed. Options are: Telnet break sequence (the default), Interrupt process, or Nothing.
Host Character Set The default value for the Host character set depends on the type of terminal you are emulating. This setting reflects the current terminal state of VT Host Character Set, which can be changed by the host. The associated default setting, saved with the model is DEC Supplemental.
Auto Answerback No (default). This setting specifies whether the answerback message (set with the Answerback property) is automatically sent to the host after a communications line connection.
Answerback String This setting allows you to enter an answerback message if the host expects an answer in response to an ENQ character.

The answerback string supports characters with codes less than or equal to 0xFFFF via Unicode escape sequences. The escape sequence begins with \u followed by exactly four hexadecimal digits. You can embed Unicode escape sequences in any string. For example, this embedded \u0045 will be interpreted as this embedded E, since 45 is the hexadecimal code for the character E.

To pass Unicode escape sequences to the host, escape the sequence with a leading backslash. For example, to send the string literal \u001C to the host, map a key to \\u001C. Host Access for the Cloud will convert this to the string \u001C when that key is pressed and send the 6 characters of the resulting string to the host.

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