This topic lists several operating modes that 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, then an initial operating mode for Telnet
client is selected using the ASCII operating mode (ASCOPRMOD) parameter of
the start TCP/IP Telnet (STRTCPTELN) or TELNET command.