GSM/GPRS Module Series
M35 User Manual
M35_User_Manual Confidential / Released 40 / 85
If autobauding is active it is not recommended to switch to multiplex mode.
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.
TXD
RXD
RTS
CTS
DTR
DCD
RI
TXD
RXD
RTS
CTS
DTR
DCD
RING
Module (DCE)
Serial portUART port
GND GND
PC (DTE)
Figure 17: Reference Design for Full-Function UART
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