Quectel EG915U-EU Manual page 49

NOTE
1. Transistor circuit solution is not suitable for applications with baud rates exceeding 460 kbps.
Module's CTS connect to MCU's CTS, module's RTS connect to MCU's RTS. In addition, pay
2.
attention to UART's CTS and RTS input and output directions.
EG915U-EU_Hardware_Design
VDD_EXT
MCU/ARM
TXD
RXD
10K
VCC_MCU
RTS
CTS
GPIO
EINT
GPIO
GND
Figure 24: Reference Circuit with Transistor Circuit
4.7K
VDD_EXT
1 nF
10K
MAIN_RXD
MAIN_TXD
1 nF
VDD_EXT
4.7K
MAIN_RTS
MAIN_CTS
MAIN_DTR
MAIN_RI
MAIN_DCD
GND
LTE Standard Module Series
Module
48 / 81