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M12 Hardware Design

M12_HD_V3.3 - 42 -

460800bps.

Computer

TXD

RXD

GND

Module (DCE)

Debug port

DBG_TXD

DBG_RXD

GND

Figure 22: Connection of debug port

3.8.3. UART3 Port

UART3:

 Two data lines: TXD3and RXD3

 UART3 port is used for AT command only and does not support GPRS data, CSD,

Multiplexing function etc.

 UART3 supports the communication baud rates as the following:

4800, 9600, 14400, 19200,28800,38400,57600,115200

 The default baud rate setting is 115200bps, and autobauding is not supported. The baud rate

can be modified by “AT+QSEDCB” command. For more details, please refer to document

[1].

Host (DTE)

Controller

TXD

RXD

GND

Module (DCE)

TXD3

RXD3

GND

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