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8.2.2 AT Command Descriptions
This chapter describes the most important AT commands of the modem. The values marked
with an asterisk (*) are the default values.
+TFORMAT - Sets the data format
Sets the data format of the serial interface.
+TFORMAT="Dataformat"
Dataformat:
DatabitsParityStopbits
Databits: 8, 7
Parity: N (none), O (odd), E (even), X (auto-detection, default)
Stopbits: 1, 2
+TBAUD - Set the baudrate
Sets the baud rate of the serial interface.
+TBAUD="Baudrate"
Baudrate:
AUTO (default), 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200,
230400
&K - Select Serial Port Flow Control
This commandspecifies theDTE-to-modem flow control.Software flowcontrol usesthe charac
-
ters XOFF (13h) and XON (11h) to stop and start data transmission, respectively, both to and
from the DTE. Bidirectional hardware flow control uses RTS/CTS to stop and startdata from the
modem
&K0 Disables flow control
&K3* Bi-directional hardware flow control - RTS/CTS
&K4 XON/XOFF software flow control
&D - DTR (Data Terminal Ready) Option
This command controls how the modem responds to DTR. After toggling DTR, the host should
wait 200 ms before modifying the UART registers or sending a new command to the modem.
This is done because the modem does not send an ‘OK’ message to indicate it has performed
the requested function.
&D0 The modem ignores DTR.
&D1 Themodem switchesfromdata tocommand modewhen anon-to-offtransition ofDTR occurs.
&D2* An on-to-off transition of DTR causes the modem to go on-hook (hang up). While DTR
is off, auto-answer is disabled.
&D3 Anon-to-off transitionof DTRreinitializes the modem.The reinitializeprocedure performsthe
same function as a power-up reset, except that the UART registers are not reconfigured.
AT Commands MIM-A01 Appendix
8-10 MITSUBISHI ELECTRIC
Command Description
&Z Store telephone number (up to 30 digits) to location 'n' (0-3)
%E Auto-retrain control
%G Rate renegotiation
-C Generate data mode calling tone
+ES Error control selection
+MS Modulation selection
*NC CallerID settings
+VCID Country code setting
@D Accept a new firmware image to flash
Tab. 8-23: Overview of AT Commands (2)