Uart Interface - Quectel UC20 User Manual

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3.5. UART Interface

UC20 EVB offers two UART interfaces: COM1 (Main UART port) and COM2. And COM2 is reserved.
The UART interface COM1 of the UC20 EVB is intended for the communication between the module and
the host application. This interface can be used for data transmission and AT communication.
The following figure shows the UART block diagram on UC20 EVB.
J301
COM1
DB9
UC20_EVB_User_Guide
RS232
Level Match
RS232
Figure 16: UART Block Diagram
9 8
5 4
Figure 17: Main UART Port (J301)
Confidential / Released
UMTS/HSPA Module Series
UC20 Mini PCIe
J801
3.3V/1.8V
Level Translator
3.3V
7 6
3 2 1
UC20 EVB User Guide
UC20-TE-A
J101
1.8V
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