
AT Commands for the MT5656ZDX, MT5600ZDX, MT5600BA/BL-Series Modems
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Multi-Tech Systems, Inc. Commands Reference Guide (PN S000273D)
Command: \Nn Error Correction Mode Selection
Values: n = 0–5
Default: 3
Description: \N0 Normal (non-error correction) mode with data buffering. (Forces &Q6.)
\N1 Direct mode. Equivalent of &M0 and &Q0 modes. (Forces &Q0.)
\N2 V.42/MNP reliable (error-correction) mode. Modem attempts first a V.42 connection
and then an MNP connection. Failure to make a reliable connection results in the
modem hanging up. (Forces &Q5, S36=4, and S48=7.)
\N3 V.42/MNP auto-reliable mode. Modem attempts first to connect in V.42 mode, then in
MNP mode, and finally in non-error-correction mode with data buffering. (Forces &Q5,
S36=7, and S48=7.)
\N4 V.42 (LAPM) reliable mode. If modem cannot make a V.42 connection, it disconnects.
(Forces &Q5 and S48=0.) Note: The -K1 command can override the \N4 command.
\N5 MNP reliable mode.If the modem cannot make an MNP connection, it disconnects.
(Forces &Q5, S36=4, and S48=128.)
Command: \Vn Single Line Connect Message
Values: n = 0 or 1
Default: 0
Description: \V0 Disables single line connect message. Connect messages are controlled by the X,
W, and S95 settings.
\V1 Enables single line connect messages in the format: CONNECT <Serial Port
Speed></Modulation></Protocol></Compression> </Line Speed>/<Voice and Data>.
Overrides X, W, and S95 commands. Connect messages display in the single line
format subject to V and Q. In non-verbose mode (V0), single line connect messages
are disabled and a single numeric result code is generated for CONNECT.
Command: +FCLASS= Display Current Fax Class
Values: 0, 1, 2, 8
Default: None
Description: 0 = Data
1 = Fax Class 1, Class 1.0
2 = Fax Class 2, 2.0, 2.1
8 = Voice Commands
10 = Reserved
V.90 Choices: 0, 1, 8, 10. V.92 Choices: 0, 1, 2, 8, 10
Command: +MS= Modulation Selection
Values: See description.
Default: See description.
Description: This extended-format command selects modulation and, optionally, enables or disables
automode, specifies the lowest and highest connection rates, selects µ-Law or A-Law
codec type, and specifies the highest transmit rate using one to five subparameters.
(See the MT5600BA/BL–V.90 Section for V.90 description of this command.)
The command format is:
+MS=[+MS=[<carrier>[,<automode>[,<min_TX_rate>[,<max_TX_rate>[,min_RX_rate>[,<max_RX_rate>]]]]]]
Subparameters that are not entered retain their current value. Commas separate optional
subparameters, and should be inserted to skip a subparameter. Example: +MS=,0,<CR>
disables automode and keeps all other settings at their current values.
+MS? Reports current options in the format
mod,automode,min_RX_rate,max_RX_rate,x_law,reserved,max_TX_rate.
Example: 56,1,300,56000,0,0,33600.
+MS=? Reports supported options in the format (list of supported mod values),(list of
supported automode values),(list of supported min_RX_rate values),(list of
supported max_RX_rate values), (list of supported x_law values), (list of
supported reserved values),(list of supported max_TX_rate values).
Example: (0,1,2,3,9,10,11,12,56,64,69),(0,1),(300-33600),(300-
56000),(0,1),(0,1),(300-33600).
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