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52 Chapter 7 Special Features: Modem Emulation
S-Registers
Register Function Range Units Saved Default
S0
Rings to Auto-Answer
Sets the number of rings required before the
Digi Device Server automatically answers a
call. Setting this register to Zero disables auto-
answer mode.
0-255 Rings * 0
S1
Ring Counter
S1 is incremented each time the modem
detects a ring signal on the telephone line. S1
is cleared if no rings occur over an eight sec-
ond interval.
0-255 Rings 0
S2
Escape Character
S2 holds the decimal value of the ASCII char-
acter used as the escape character. The
default value corresponds to an ASCII ’+’. A
value over 127 disables the escape process,
i.e., no escape character will be recognized.
0-255 ASCII * 43
S3
Carriage Return Character
Sets the command line and result code termi-
nator character. Pertains to asynchronous
operation only.
0-127 ASCII 13
S4
Line Feed Character
Sets the character recognized as a line feed.
Pertains to asynchronous operation only. The
Line Feed control character is output after the
Carriage Return control character if verbose
result codes are used.
0-127 ASCII 10
S5
Backspace Character
Sets the character recognized as a backspace.
Pertains to asynchronous operation only. The
modem will not recognize the Backspace char-
acter if it is set to a value that is greater than 32
ASCII. This character can be used to edit a
command line. When the echo command is
enabled, the modem echoes back to the local
DTE the Backspace character, an ASCII space
character and a second Backspace character;
this means a total of three characters are trans-
mitted each time the modem processes the
Backspace character.
0-32 ASCII 8
S6 Accepted but ignored. 2-255 s * 2
S7 Accepted but ignored. 1-255 s * 50
S8 Accepted but ignored. 0-255 s * 2
S9 Accepted but ignored. 1-255 0.1 s * 6
S10 Accepted but ignored. 1-255 0.1 s * 14
S11 Accepted but ignored. 50-255 0.001 s * 95
S12
Escape Prompt Delay
Defines the maximum period, in fiftieths of a
second, allowed between receipt of the last
character of the three escape character
sequence from the DTE and sending of the OK
result code to the DTE. If any characters are
detected during this time, the OK will not be
sent. Note that sending of the OK result code
does not affect entry into command mode.
0-255 0.02 s * 50