4-2
4.2.
S-REGISTER DEFINITIONS
S0 - Number of Rings to Auto-Answer
Sets the number of the rings required before the modem automatically answers a call. Setting this register to zero disables auto-answer
mode.
Range:
0-255 rings
Default:
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 second
interval.
Range:
0-255 rings
Default:
0
S2 - Escape Character
S2 holds the decimal value of the ASCII character 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.
Range:
0-255, ASCII decimal
Default:
43 (+)
S3 - Carriage Return Character
Sets the command line and result code terminator character. Pertains to asynchronous operation only.
Range:
0-127, ASCII decimal
Default:
13 (Carriage Return)
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
Range:
0-127, ASCII decimal
Default:
10 (Line Feed)
S5 - Backspace Character
Sets the character recognized as a backspace. Pertains to asynchronous operation only. The modem will not recognize the Backspace
character 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 transmitted each time the modem processes the Backspace character.
Range:
0-32, ASCII decimal
Default:
8 (Backspace)
S6 - Wait Time for Dial Tone Before Blind Dialing, or After
“
W
”
Dial Modifier
Sets the length of time, in seconds, that the modem will wait before starting to dial after going off-hook when blind dialing. This operation,
however, may be affected by some ATX options according to country restrictions. The
“
Wait for Dial Tone
”
call progress feature (W dial
modifier in the dial string) will override the value in register S6. The modem always pauses for a minimum of 2 seconds, even if the value of
S6 is less than 2 seconds.
Range:
2-255 seconds
Default:
2
S7 - Wait Time For Carrier After Dial, For Silence, or For Dial Tone After
“
W
”
Dial Modifier
1.
Sets the length of time, in seconds, that the modem will wait for carrier before hanging up. The timer is started when the modem
finishes dialing (originate), or 2 seconds after going off-hook (answer). In originate mode, the timer is reset upon detection of answer
tone if allowed by country restrictions.
2.
Sets the length of time, in seconds, that modem will wait for silence when encountering the @ dial modifier before continuing with the
next dial string parameter.
3.
For US models, S7 sets the length of time, in seconds, that the modem will wait for dial tone when encountering a
“
W
”
dial modifier
before continuing with the next dial string parameter.
Range:
1-255 seconds
Default:
50
