Nortel M2000 Reference Manual page 84

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The firmware does not perform a range check on the value assigned to
an S register. The range in Table 2 only indicates those values that give
the expected results. Any other values may or may not function as
desired and are not flagged as an error when the command is
processed. Valid ASCII codes range from 0 to 127. Values larger than
127 may disable the function associated with that S register. Values
larger than 255 are accepted without an error, but are stored modulo
256.
The following table contains Hayes keyboard dialing parameter
registers:
Table 2 Hayes Keyboard Dialing parameter registers (Sheet 1 of 2)
Problem User Input
S0 0-255 rings
S1 0-255 rings
S2 0-127 valid ASCII code
S3 1-127 valid ASCII code
S4 0-127 valid ASCII code
S5 0-32, 127 ASCII codes
S7 1-255 s
S8 0-255 s
autobaud and autoparity. Processing of the command line is not
done until the carriage return is received.
Input may be in either upper or lower case, but not mixed.
Simple character editing may be done on each command using the
ASCII backspace.
Each command line can contain several commands. Each line is
limited to 40 characters, excluding AT.
Punctuation characters, like commas or parentheses, are allowed
but are included in the character count of the command line. A
space can also be used, but it is not counted in the character count.
Call setup parameters may be programmed through a register set
called the S–registers. (Refer to Table 2.)
Meridian SL-100 M2000 Digital Telephone Reference Manual
Default Description
1 number of rings before
answer
0 Counts number of rings
43 escape code character
13 carriage return character
10 line feed character
8 backspace character
30 wait time for carrier
2 pause time for comma (,)
(not supported)
Keyboard dialing 17