VT220 workstation operating modes

Several operating modes are supported while the system negotiates the VT220 workstation type.

These operating modes are as follows:

• VT200 mode with 7-bit controls is the default mode and uses the standard ANSI functions. This mode provides the full range of VT220 capabilities in an 8-bit communications environment with 7-bit controls. This mode supports the DEC multinational character set or national replacement character (NRC) sets, depending on the character set mode selected.

• VT200 mode with 8-bit controls uses the standard ANSI functions and provides the full range of VT220 capabilities in an 8-bit communications environment with 8-bit controls. This mode supports the DEC multinational character set or NRC sets, depending on the character set mode selected.

• VT100 mode uses standard ANSI functions. This mode restricts the use of the keyboard to VT100 keys. All data has a 7-bit restriction, and only ASCII, NRC, or special graphics characters generate.

• VT52 mode uses DEC private functions (not ANSI). This mode restricts the use of the keyboard to VT52 keys.

If VT220 mode is negotiated, an initial operating mode for the Telnet client is selected using the ASCII operating mode (ASCOPRMOD) parameter of the start TCP/IP Telnet (STRTCPTELN) or TELNET command.

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