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52 536EX Chipset Developer’s Manual
Intel Confidential
Data Mode AT COMMANDS
+MA=m none
Modulation Automode Control: This command specifies the alternative to the preferred modulation
specified in the +MS=<carrier> command. Alternative modulations are only available when
+MS=,<automode> enables automode. The alternative modulations available for the +MA command are
limited to all modulations the modem supports below the preferred modulation specified by
+MS=<carrier>. The +MA parameters are reset to all modulations supported by the modem below the
preferred modulation whenever the +MS=<carrier> changes the preferred modulation. The order of
priority of alternative modulations is determined by such mechanisms as V.8 and PN2330, not the order
in which they were entered for this command. <carrier> values omitted are no available as alternative
modulations.
m= <carrier>,<carrier>,…<carrier>
Defaults: all modulations below +MS=<carrier> and allowed by the DCE limits in the +MS command
<carrier> specifies the alternative modulations that are available. A table of these modulations are given
in +MS command description.
+MA? will display a list of enabled alternative modulations
+MA=? will display a list of available alternative modulations. This list is determined by the current values
of the +MS parameters for preferred modulation, automode and DTE rate limits. For example:
If +MS=<V32B>, V.34, V.90, and V.92 will not be available because they are above V.32 bis.
If +MS = ,0,, no alternative modulations will be available.
If +MS=V34,1,4800,33600, V.22 bis will not be available because its maximum DCE bit rate is
2400bps.
+MR=m 0
Modulation Reporting Control: Controls whether the “+MCR: and +MRR” result codes are transmitted
from the DCE to the DTE once a connection has been made. If enabled the result code displayed shall
represent the current negotiated DCE-DCE modulation and rate, and are issued before the Error Control
(+ER:) or Data Compression reports (+DR:) and before the final result code “CONNECT”. The format is
as follows:
0 Disables reporting of modulation (no +MCR and +MRR intermediate result code
transmitted)
1 Enables reporting of modulation (+MCR and +MRR intermediate result code transmitted)
Example if +MR = 1
+MCR: V34
+MRR: 33600
Table 18. Data Mode Command Descriptions (Continued)
Command Default Description
NOTE: An asterisk (*) denotes the factory-default setting.