B-2 Appendix B Date Code 20010518
SEL-2020 Instruction Manual
DEFAULT FACTORY SETTINGS
The SEL-2020 optional internal modem is shipped to you with user profile 0 active. This profile
contains modem factory default settings, except for the following items:
• Command characters are not echoed (E0).
• Basic result codes are enabled (X0).
• Modem ignores DTR (&D0).
• Modem will answer on 4 rings (S0=4).
THE MODEM COMMAND SET
In general, all commands except the A/ (repeat the previous command line) command, and the
Escape sequence +++ have the syntax:
AT<CR>
where AT is the attention command alerting the modem that a command follows and <CR>
(carriage return) signifies the end of the command line. The modem recognizes all upper case or
all lower case characters, i.e., AT or at, but not mixed cases, i.e., At or aT. The command may
be a single command:
ATS0=1<CR>
or a sequence:
ATS0=1&D2&W<CR>
The modem examines the command line prefix to determine the communications settings of your
computer (bps and parity) and adopts these settings automatically. They remain in effect until
the modem receives another AT command, you issue a command to change them, or the modem
is turned off.
THE S REGISTERS
Software registers (S registers) contain information that controls the operation of your modem.
The S registers and a description of their functions follow the AT Command Set tables.
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