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Appendix B – Modem Commands
This appendix describes the AT commands supported by the MultiAccess MA30120 modems along with
application specific usage. The primary purpose of this appendix is for use with Customer specific inbound or
outbound data applications that use the MultiAccess modems set to a usage of "Modem Sharing".
COMPATIBILITY: The industry standard AT Command set, was devised to control the operation of
standalone (traditional) modems. Such modems connect to the telephony network in the same way as a
private telephone, with a ring detector and a hook relay. Their data connection is an RS-232 serial interface,
with control signals such as DTR, RTS, DCD, and so on. Many of the functions associated with these
traditional interfaces have no counterpart in the MA30120 modems. Wherever possible, support for common
AT commands and S-Registers has been added with a view to ease of software compatibility. Please refer to
section 3 of this appendix for additional details.
Note: Due to the nature of the Multi Access modems, user defined parameters (non factory defaults) must be
issued to the modem before each call attempt.
The following sections within this appendix depict the AT commands supported by the MultiAccess.
1) AT Command Syntax Convention
2) Standard AT Commands Supported
3) Standard AT Commands Accepted with No Effect
4) S Registers
5) Advanced MultiAccess Modem Commands
6) Application Notes
7) ASCII Conversion Chart
"AT" Command Syntax Convention
"AT" Command Input Processing
In conformance to convention, the "AT" prefix is omitted from commands in the descriptions below. Thus, the
answer command documented in the "AT Commands
sent as a single command.
Commands may be chained, (directly concatenated) in which case the "AT" prefix should only precede the first
command. For example, the command input string "ATE0V0" would both disable command echo and set the
result code format to numeric.
All input command strings must be terminated by a carriage return (cr). Any line feed (lf) after the carriage
return is ignored. The characters that the parser interprets as carriage return and line feed can be chosen as
described in Parser Characters Settings.
The command "A/" is an exception to all three of the above rules in that it must not have an "AT" prefix, cannot
be chained and must not be terminated by a carriage return, refer to "AT" Commands Supported.
MultiAccess Communications Server MA30120 User Guide
Supported"
section as "A" would actually appear "ATA" if
Appendix B – Modem Commands
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