Specifications

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Chapter 4 - AT Commands, S-Registers and Result Codes
Command: <BREAK>AT<CR> Escape Sequence
Values: n/a
Description: Alternate escape method. Puts modem in com-
mand mode while remaining on line. Send a
<BREAK> signal followed by AT, up to sixty
command characters, and a RETURN. You must
set the modem to %E2 or %E3 before you can
use this escape method.