The Connection Of Uart - Quectel M35 User Manual

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If autobauding is active it is not recommended to switch to multiplex mode.
NOTE
To assure reliable communication and avoid any problems caused by undetermined baud rate between
DCE and DTE, it is strongly recommended to configure a fixed baud rate and save it instead of using
autobauding after start-up. For more details, please refer to the Section ―AT+IPR‖ in document [1].
3.7.1.2.

The Connection of UART

The connection between module and host using UART Port is very flexible. Three connection styles are
illustrated as below.
Reference design for Full-Function UART connection is shown as below when it is applied in
modulation-demodulation.
Module (DCE)
M35_User_Manual
UART port
TXD
RXD
RTS
CTS
DTR
DCD
RI
GND
Figure 17: Reference Design for Full-Function UART
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GSM/GPRS Module Series
M35 User Manual
PC (DTE)
Serial port
TXD
RXD
RTS
CTS
DTR
DCD
RING
GND
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