BAT C OMMANDS,
REGISTERS, AND RESULT
CODES
The 3Com Impact ISDN digital modem commands are
summarized in Table B-1, modem commands for the internal
analog modem in Table B-1, remote S registers in Table B-3,
and digital modem result codes in Table B-4.
AT Command Set for the 3Com Impact
Digital Modem
Table B-1 summarizes the AT command set.
Table B-1 AT Command Set Summary
Command Function (Example) Description
AAnswer incoming circuit-switched
digital modem call (AT A)
Answers an incoming call.
&C Serial port CD control (AT &C2) &C0 forces CD to remain on at all times.
&C1 forces CD to follow the state of
carrier from the remote system. CD turns
on after CONNECT message is sent to
host (default).
&C2 forces CD to remain on except
temporarily after disconnect.
D (ATD5551234) Dials an outgoing 56/64 Kbps
circuit-switched digital connection.
DT (ATDT5551234) Dials an outgoing analog modem call,
using the optional V.32bis modem, at a
maximum modem line speed of
14.4 Kbps using touch-tone dialing.
DP (ATDP5551234) Dials an outgoing analog modem call,
using the optional V.32bis modem, at a
maximum modem line speed of
14.4 Kbps using pulse dialing.
(continued)