Multi-Tech Systems MT5634ZBA - Manual (Page 31)

Chapter 4 - AT Commands, S-Registers, Result Codes
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MultiModemDID User Guide
Escape Commands
Command: +++AT<CR> Escape Sequence
Values:
n/a
Description: Puts the modem in command mode (and optionally issues a
command) while remaining online. Type +++AT and up to six
command characters, then press ENTER. Used mostly to issue
the hang-up command: +++ATH<CR>.
Command: %%%AT<CR> Remote Configuration Escape Sequence
Values:
n/a
Description: Initiates remote configuration mode while online with remote
modem. The remote configuration escape character (%) is de-
fined in register S13.