AT_CommandCodes

Modem commands can be used with AT (Hayes) compatible modems. Each command is prefixed by 'AT'.

Code	Description
+++	Escape Code
A	Answer Phone Line
AT	Attention
E	Inhibit Echo (stop seeing double characters)
E1	Enable command echo (default)
H	Hang Up
H1	Pick up phone line
I	Report ID code
I1	Perform checksum on the ROM (return 3 ASCII numbers)
I2	Perform checksum on the ROM (return OK or Error)
I3	Report ROM revision number
I4	Report supported protocols (encrypted format)
I5	Report Firmware copyright Info
I10	Report optional features
L	Low speaker volume
L2	Medium speaker volume (default)
L3	High Speaker volume
M	Speaker always off
M1	Speaker On until carrier is detected (default)
M2	Speaker Always On
M3	Speaker Off while dialing
N	Connect at the rate specified by S37
N1	Connect at the highest rate supported
O	Go online
O1	Go online and retrain

&C	DCD signal always on
&C1	DCD shows when remote modem carrier is present

&D0	Ignore On/Off DTR transition
&D1	Use asynchronous command state
&D2	Disconnect and return to command state

&F	Direct mode with NO flow control
&F2	with flow control

&K	Disable flow control
&K3	Enable bidirectional hardware flow control (RTS/CTS)
&K4	Enable software flow control (XON/XOFF)
&K5	Enable transparent software flow control

&Q0	Asynchronous Direct Mode
&Q5	Reliable mode

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