User's Manual

GSM/GPRS/GNSS Module Series
MC20 Hardware Design
MC20_Hardware_Design Confidential / Released 26 / 95
transmitted through UART port, thus realizing communication between the module and the MCU.
In stand-alone solution, GSM data and AT commands are transmitted through UART port; while GNSS
data such as PMTK command and NMEA sentences output are transmitted through GNSS UART port.
The hardware difference between all-in-one solution and stand-alone solution mainly lies in the
connection method of UART, UART_AUX, and GNSS_UART. The corresponding schematic diagrams are
shown below.
Figure 3: All-in-one Solution Schematic Diagram
Figure 4: Stand-alone Solution Schematic Diagram