User Manual

61
Chapter 4—AT Commands, S-Registers, Result Codes
Command: Bn Communication Standard Setting
Values: n = 0–3, 15, 16
Default: 1 and 16
Description: B0 Select ITU-T V.22 mode when modem is at 1200 bps.
B1 Select Bell 212A when modem is at 1200 bps.
B2 Deselect V.23 reverse channel (same as B3).
B3 Deselect V.23 reverse channel (same as B2).
B15 Select V.21 when the modem is at 300 bps.
B16 Select Bell 103J when the modem is at 300 bps.
Command: Ds Dial
Values: s = dial string (phone number and dial modifiers)
Default: none
Description: Dial telephone number s, where s may up to 40 characters long and include the 0–9, *,
#, A, B, C, and D characters, and the L, P, T, W, S, comma (,), semicolon (;), !, @, ^ and
$ dial string modifiers.
Dial string modifiers:
L Redial last number. (Must be placed immediately after ATD.)
P Select pulse-dialing until a T is encountered. Affects current and subsequent dialing.
T Select tone-dialing until a P is encountered. Affects current and subsequent dialing.
W Wait for a new dial tone before continuing to dial. (X2, X4, X5, X6, or X7 must be
selected.)
, Pause during dialing for time set in register S8.
; Return to command mode after dialing. Place at end of dial string.
! Hook flash. Causes the modem to go on-hook for one-half second, then off-hook
again.
@Wait for quiet answer. Causes modem to wait for a ring back, then 5 seconds of si-
lence, before processing next part of command. If silence is not detected, the modem
returns a NO ANSWER code.
^ Disable data calling tone transmission.
$ Detect AT&T call card “bong” tone. The character should follow the phone number
and precede the user’s call card number: ATDT1028806127853500$123456789.
Command: DS=n Dial Stored Telephone Number
Values: n = 0, 1, 2
Default: none
Description: Dials a number previously stored in directory number y by the &Zn=x command. Ex-
ample: ATDS=1.
Command: En Echo Command Mode Characters
Values: n = 0 or 1
Default: 1
Description: E0 Does not echo keyboard input to the terminal.
E1 Does echo keyboard input to the terminal.
Command: Fn Echo Online Data Characters
Values: n = 0 or 1
Default: 1
Description: F0 Enables online data character echo. (Not supported.)
F1 Disables online data character echo (included for backward compatibility with
some software).