User's Manual

GSM/GPRS/GNSS Module Series
MC20 Hardware Design
MC20_Hardware_Design Confidential / Released 50 / 95
Figure 21: Auxiliary and GNSS UART Port Connection in All-in-one Solution
As the GNSS part of MC20 module outputs more data than a single GNSS system, the default output
NMEA types running in 4800bps baud rate and 1Hz update rate will lose some data. The solution to avoid
losing data in 4800bps baud rate and 1Hz update rate is to decrease the output NMEA types. 115200bps
baud rate is enough to transmit GNSS NMEA in default settings and it is thus recommended.
3.6.3.2. Connection in Stand-alone Solution
In stand-alone solution, the GNSS UART Port is connected to the COM port of peripheral. During
firmware upgrade, switch S1 should be kept closed. Otherwise, it should be kept open. A reference design
is shown below.
NOTE