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8–14
S30 Dial-backup phone number pointer; default: 0:
S31 Default: 17; contains the ASCII decimal value of the XON character.
S32 Default: 19; contains the ASCII decimal value of the XOFF character.
S33 Reserved.
S34 Default: 30; dial-backup restoral lookback timer, in minutes.
S35 Bit-mapped register; default: 32:
Code Dec. Description
*B0 0 Disables dial backup.
*Bn 1-50 Enables dial backup and sets the dial backup
phone number pointer at location n-1 in the
EEPROM. (See also S44b2)
Note: When the leased line has become unoperational, the modem will
automatically switch to dial line and the originate mode modem
will dial the number according to the pointer saved here if dial
backup was enabled; the answer mode modem will try the leased
line and wait for a ring if dial backup is enabled (a non-zero
number is selected).
Note: In dial backup operation, in addition to switching to the dial-up
line, the modem automatically looks back to determine whether the
leased line is again operational. This timer disconnects the current
dial-up line and attempts to connect on the original leased line. If it
is still unavailable, the dial-up line continues to be used.
Code Bits Bin. Dec. Description
(7) 1 128 Enables an extended numerical result code:
50 to 65 when an error control connection is
made, used with ATV0 (See also S23b6):
50 CONNECT 58 CONNECT 16800
51 CONNECT1200 59 CONNECT 19200
52 CONNECT2400 60 CONNECT 21600
53 CONNECT4800 61 CONNECT 24000
54 CONNECT7200 62 CONNECT 26400
55 CONNECT9600 63 CONNECT 28800
56 CONNECT12000 64 CONNECT 31200
57 CONNECT14400 65 CONNECT 33600