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GE2015
Dev Board User Guide
5.2.
UART1
UART1 and USB-UART1 share the same UART1 interface, 8 indicator lights (LRXD/LTXD/LRI/LDCD/LDSR/DTR/LRTS/LCTS) can display the logic level of every pin of UART
interface clearly, as shown in the left figure below. the default of main UART setup is: 115200-8-N-1.
Jumper TP21 and TP20 are used for the connectivity between VCCIO level of UART1 and 3.3V level as shown in the right figure below.
Note: You can choose the VCCIO level either 3.3V or 1.8V by jumper TP2. The detail information please refer to chapter 5.1.4.
All functions of module can be processed by AT command sending from computer and other DTE via communication interface.
Note: These two interfaces of UART1 &UART1-USB cannot be used simultaneously, please shift between TP8 and TP3. Jumper TP8 is used for connecting UART1