M12 Hardware Design
M12_Hardware_Design_V3.3 - 44 -
MCU/ARM
/TXD
/RXD
VDD_EXT
4.7K
VCC_MCU
4.7K
5.6K
4.7K
VDD_EXT
TXD
RXD
RTS
CTS
DTR
RI
/RTS
/CTS
GND
GPIO DCD
Module
GPIO
EINT
VCC_MCU
Voltage level: 5V
4.7K
GND
Figure 25: 5V level match circuit
The following picture is an example of connection between module and PC. A RS232 level shifter
IC or circuit must be inserted between module and PC, since these three UART ports do not
support the RS232 level, while support the CMOS level only.
To Next Page
Loading...
Need help?
General
