r6781-12 Conexant Systems, Inc., r6781-12 Datasheet - Page 57

• Manufacturer Part Number: r6781-12
• Description: Embedded Modem Family
• Manufacturer: Conexant Systems, Inc.

EmbeddedModem Family
Table 5-2. S Register Description (1 of 8)
D224ATLVDSC
Register
S3
S4
S5
S6
S7
S0
S1
S2
Default
00
00
43
13
10
08
02
30
0
–
Range
0
0
2
1
0–255
0–255
0–127
32, 127
–
–
–
–
127
127
255
255
Seconds
Seconds
ASCII
ASCII
ASCII
Units
Rings
Rings
ASCII
Conexant
Ring to Answer On. Assigning S0 a value from 1 to 255 places the
modem in auto-answer mode. The modem will auto answer after
the specified number of rings has occurred.
Ring Count. S1 is incremented each time a ring is detected. It will
be cleared if no ring occurs within 8 seconds after the last ring.
Escape Code Character. S2 holds the ASCII value used for the
escape code. The + character responds to the factory default value.
Values greater than 127 disable the escape code operation. To
enter the command mode when the escape code is disabled, a loss
of carrier must occur or DTR must be set to a 0 (dependent on &D
command).
Carriage Return Character. S3 holds the ASCII value for the
carriage return; 13 is the standard value. The character in S3 is
both the command line terminator and the result code terminator.
Line Feed Character. S4 holds the ASCII value for the line feed.
The line feed character is output after the carriage return only
when English word result codes have been selected (V1). If a line
feed character is not desired, it may be changed to a null, but it
cannot be totally disabled.
Backspace Character. S5 holds the ASCII value for the backspace
character. This character is both the backspace key and the
character echoed to move the cursor back one position. Normally
a value of 8 is used. The backspace character must not be set to a
value corresponding to a printable ASCII character (i.e., between
33 and 126) or to a value greater than 127. A backspace is used as
follows:
back over the last character entered. The last character in the com-
mand buffer is deleted.
Wait for Dial Tone. S6 specifies the wait time before dialing. The
delay allows time for the dial tone to occur on the telephone line.
The minimum time is 2 seconds. Values greater than 2 seconds
may be necessary if trouble is encountered getting dial tones.
Wait for Carrier After Dial. S7 specifies the delay time that the
modem waits for the carrier signal from the remote modem before
hanging up. Typically, a delay time of 30 seconds is enough, but it
can be extended to 255 seconds. If the carrier is not detected
within the specified time period, the modem hangs up and sends
the NO CARRIER result code. If carrier is detected, the modem
returns the CONNECT result code and goes on-line.
Setting S0 to 0 disables auto-answer.
The keystroke is echoed back to the terminal and the cursor moved
Description
5-3