Windows Marketplace V.90 - Manual (Page 29)

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Bn Communication Standard Setting
This command determines CCITT vs. Bell standard.
B0: Selects CCITT V.22 mode when the modem is at 1200 bits/s.
B1: Selects Bell 212A when the modem is at 1200 bits/s (default).
B2: Unselects V23 reverse channel ( same as B3).
B3: Unselects V23 reverse channel ( same as B2).
B15: Selects V.21 when the modem is at 300 bits/s.
B16: Selects Bell 103J when the modem is at 300 bits/s (default).
Result Codes:
OK n = 0, 1, 15, 16
ERROR Otherwise
Cn Carrier Control
The modem will accept the C1 command without error in order to ensure back-
ward compatibility with communications software that issues the C1 command.
However, this modem does not support the C0 command. The C0 command may
instruct some other modems to not send carrier (i.e., it puts them in a receive-only
mode).
C0: Transmit carrier always off.
C1: Normal transmit carrier switching.
Result Codes:
OK n = 1
ERROR Otherwise
Dn Dial
This command instructs the modem to begin the dialing sequence. The dial string
(n, including modifiers and the telephone number) is entered after the ATD com-
mand.
A dial string can be up to 40 characters long. Any digit or symbol (0-9, *, #, A, B,
C, D) may be dialed as touch-tone digits. Characters such as spaces, hyphens, and
parentheses do not count, they are ignored by the modem and may be included in
the dial string to enhance readability.
The following may be used as dial string modifiers: