Chapter 1 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
31
Syntax: ATMS=<carrier>,<automode>,<min_rate>,<max_rate>,<min_rx_rate>,
<max_rx_rate>
<carrier> Values:
V92 V.92
(default)
V90
V.90
V34
V.34
V32B
V.32bis
V32
V.32
V22B
V.22bis
V.22
V.22
Bell212A
Bell
212A*
V23C
V.23, constant carrier, asymmetric FDM
V21
V21
Bell103
Bell
103*
*The +MS command was standardized by ITU-T recommendation V.250. However,
the standard command does not include the additional functionality provided by the
Bell212A and Bell103 values of the <carrier> parameter.
<automode> Values:
Automatic modulation negotiation is enabled or disabled by <automode>.
However, if a value is specified for the <max_rate> then, automatic rate selection
is disabled and the modem will attempt to connect at the specified rate.
0
Disables
automode.
1
Enables
automode.
(Default)
<max rate> Values:
The <max_rate> specifies the highest connections rate for the DCE.
31200
Determined by modulation selected in <carrier>. (Default)
300-56000
Value limited by modulation selected <carrier>.
<max rate> for each <carrier>.
V34
2400 bits/s—33600 bits/s in steps of 2400 bits/s.
V32bis
4800 bits/s—19200 bits/s in steps of 2400 bits/s.
V32
4800 bits/s—14400 bits/s in steps of 2400 bits/s.
V22bis 2400
bits/s.
V22 2200
bits/s.
V23C, Bell212A 1200 bits/s.
V.21, Bell103
300 bits/s.
Valid <max rate> Range
56000
Determined by modulation selected in <carrier>. (Default)
300-56000
Value limited by modulation selected <carrier>.
Valid <max rx rate> Value for each <carrier>
V92
28000 bits/s—56000 bits/s in steps of 1333 bits/s
V90
28000 bits/s—56000 bits/s in steps of 1333 bits/s
V34
2400 bits/s—33600 bits/s in steps of 2400 bits/s
V32bis
4800 bits/s—19200 bits/s in steps of 2400 bits/s
V32
4800 bits/s—14400 bits/s in steps of 2400 bits/s
V22bis 2400
bits/s
V22 2200
bits/s
V23C, Bell212A 1200 bits/s
V.21, Bell103
300 bits/s
Reports
:
+MS?
Reports current or selected options.
+MS?
Reports
supported
options.
Result Code:
OK
ERROR
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