User's Manual

GSM/GPRS/GNSS Module Series
MC60 Hardware Design
MC60_Hardware_Design Confidential / Released 51 / 99
the new baud rate by receiving the first “AT” or “at” string. The DTE may receive unknown characters
after switching to a new baud rate.
 It is not recommended to switch to autobauding from a fixed baud rate.
 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.
A reference design for Full-Function UART connection is shown as below when it is applied in
modulation-demodulation.
Figure 21: Reference Design for Full-Function UART
Three-line connection is shown as below.
NOTE