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Chapter 5 – AT Commands, S-Registers, and Result Codes
SocketModem Global MT5634SMI Developer’s Guide 35
V.92 Commands
Command: +MS= Modulation Selection
Values: See description.
Defaults: See description.
Description: This extended-format command selects modulation, enables or disables automode, and
specifies the highest downstream and upstream connection rates using one to four
subparameters.
The command syntax is
+MS=[mod][,[automode][,[0][,[max_rate][,[0][,[max_rx_rate]]]]]]<CR>
Subparameters that are not entered retain their current value. Commas separate optional
subparameters, and must be inserted to skip a subparameter. Example: +MS=,0<CR>
disables automode and keeps all other settings at their current values.
+MS=? Reports supported options in the format (list of supported mod values),(list of supported
automode values),(0),(list of supported max_rate values),(0),(list of supported max_rx_rate
values). Example: +MS: (BELL103, V21, BELL212A, V22, V22B, V23C, V32, V32B, V34,
V90, V92), (0, 1), (0), (0-33600), (0), (0-56000)
+MS? Reports current options in the format mod, automode, 0, max_rate, 0, max_rx_rate.
Example: +MS: V92, 1, 0, 31200, 0, 56000.
Subparameters
mod Specifies the preferred modulation (automode enabled) or the modulation to use in
originating or answering a connection (automode disabled). The default is V92.
mod
Modulation Possible rates (bps)
1
V92
2
V92 56000, 54666, 53333, 52000, 50666, 49333,
48000, 46666, 45333, 44000, 42666, 41333.
40000, 38666, 37333, 36000, 34666, 33333,
32000, 30666, 29333, or 28000
V903 V.90 56000, 54666, 53333, 52000, 50666, 49333,
48000, 46666, 45333, 44000, 42666, 41333.
40000, 38666, 37333, 36000, 34666, 33333,
32000, 30666, 29333, or 28000
V34 V.34 33600, 31200, 28800, 26400, 24000,
21600,19200, 16800, 14400, 12000, 9600,
7200, 4800, or 2400
V32B V.32bis 14400, 12000, 9600, 7200, or 4800
V32 V.32 9600 or 4800
V22B V.22bis 2400 or 1200
V22 V.22 1200
V23C V.23 1200
V21 V.21 300
Bell212A Bell 212A 1200
Bell103 Bell 103 300
Notes:
1. See optional <automode>, <max_rate>, and <max_RX_rate>
subparameters.
2. Selects V.92 modulation as first priority. If a V.92 connection
cannot be established, the modem attempts V.90, V.34, V.32bis, etc.
3. Selects V.90 modulation as first priority. If a V.90 connection
cannot be established, the modem attempts V.34, V.32bis, etc.