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Appendices
AT% (Percent) Commands
Command OptionsFunction & Description
%An Set auto-reliable fallback character
n=1-127
Specify the ASCII character that tells
the modem to return (or fallback) from
auto-reliable (MNP) mode to a normal
connection on the answering modem
%Cn Data compression option
%C0 No compression
%C1 * MNP 5 compression
%Gn Auto fallback/fall-forward options
%G0 * Disabled
%G1 Enabled
AT\ (Back Slash) Commands
Command OptionsFunction & Description
\An Block size for V.42
\A0 Max. 64 characters
\A1 Max. 128 characters
\A0 Max. 192 characters
\A0 * Max. 256 characters
\Cn Set auto-reliable buffer
\C0 * Doesn’t buffer data
\C1 Buffer data on answering mode for 4
seconds, until 200 characters have
been buffered, and then switch to
normal mode and the buffered
characters are passed to the serial
port. If a SYN character is detected,
reliable mode is attempted
\C2 Doesn’t buffer data on answering
mode upon receipt of auto-reliable
character and passes it to serial port
* Factory default setting