Computer Busses

C

Modem Codes

C.1 AT commands

The AT commands are preceded by the attention code AT. They are:

A	Go on-line in answer mode
Instructs the modem to go off-hook immediately and then make a connection with a remote modem
Bn	Select protocol to 300 bps to 1200 bps
B0	Selects CCITT operation at 300 bps or 1200 bps
B1	Selects BELL operation at 300 bps or 1200 bps
D	Go on-line in originate mode
Instructs the modem to go off-hook and automatically dials the number contained in the dial string which follows the D command
En	Command echo
E0	Disable command echo	E1 Enables command echo (default)
Fn	Select line modulation
F0	Select auto-detect mode
F1	Select V.21 or Bell 103
F4	Select V.22 or Bell 212A 1200 bps
F5	Select V.22bis line modulation.
F6	Select V.32bis or V.32 4800 bps line modulation ...