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OnCell G2150I AT Command Set General Commands
3-13
command is ignored and the modem will return a +CME ERROR: <err> response.
Restrictions
• Only basic option and UIH framing is supported.
• Only convergence layers type 1 and 3 are supported.
• Autobauding is not compliant with multiplexing mode. It is neither possible to start
multiplexing when autobauding is active (AT+IPR=0), nor to set autobauding during
multiplexing mode, since the multiplexer uses only a fixed baudrate. In the same way,
the bit rate cannot be changed through the AT+IPR command while multiplexing mode
is active. Therefore, the AT+IPR=<rate> command should not be used and will have no
effect.
• Before starting multiplexing mode, port speed must be configured by the
AT+IPR=<rate> command, to be compliant with values defined in 4.24.3 Defined
valuesfor <port_speed> parameter.
Specific behaviors
• In multiplexing mode, AT configuration commands (AT+CMEE for example), will be
applied to all logical channels.
• In multiplexing mode, unsolicited result code will be sent to all logical channels.
• Since AT commands are grouped by classes, launching an AT command from a port
causes the lock of all commands belonging to the same class. If an AT command of the
locked class is launched from another port, a +CME ERROR: 536 will occur as long as
the class is not released (at first command completion time).
• In internal mode, if GPS is used on UART2, it is not possible to start multiplexing
mode on UART2. In the same way, if multiplexing mode is started on UART2, it is not
possible to use GPS in internal mode.
• If Bluetooth is started, it is not possible to start multiplexing mode on UART2. In the
same way, if multiplexing mode is started on UART2, it is not possible to start
Bluetooth.
• If TMT (Terminal Emulator) is launched on a specific UART, it is not possible to start
multiplexing mode on this UART. TMT must be closed before starting multiplexing
mode. On the other hand, as soon as multiplexing mode is started, HAPC can be started
on a DLCi.
• After an AT+CFUN=1 command during a multiplexing mode session, multiplexing
mode is automatically restarted by the modem with previous parameters and all
previous opened DLCs are reopened with the speed of AT+IPR? Command.
• DCD, RI, and DTR signals are managed virtually; when V24 sets DCD, RI or DTR
signals, an MSC frame is sent to the remote part to indicate a virtual state change. All is
logical, no physical signal is involved.
• +++ Escape Sequence is always available to get offline.
• Flow control can be managed either physically, or virtually by MSC. By default, the
G2150I manages hardware flow control on a UART, which becomes virtual on logical
channels when some DLCs are opened.
• At multiplexing mode session stop, it is not necessary to reset the G2150I; it
automatically goes back into AT mode.
• 2 timeouts are implemented for multiplexing mode connection:
y Multiplexing mode starts the connection: 30 seconds. After this timeout, multiplexing mode is
stopped and a previous physical port is reopened.
y DLC inactivity timeout: 5 minutes This timeout is armed only if no DLC is opened, to avoid to
be blocked into only DLC0 opening channel state. After this timeout, multiplexing mode
stopped and previous physical port is reopened.
Command syntax:
AT+CMUX=<mode>[,<subset>[,<port_speed>[,<N1>[,<T1>[,<N2>[,<T2>[,<T3>]]]]]]]
Response syntax:
+CMUX:<mode>,<subset>,<port_speed>,<N1>,<T1>,<N2>,<T2>,<T3>