Ebyte E90-DTU User Manual page 12

Chengdu Ebyte Electronic Technology Co., Ltd.
Pin NO. Definition
1 VCC
2 GND
3 485_B
4 485_A
Note: The transceiver will be in poor communication when connected to multiple devices , it is recommended to be
connected to a single device, please try to use parallel 120Ω resistor between 485_A terminal and 485_B.
Copyright ©2012–2020，成都亿佰特电子科技有限公司
Function
Crimping power interface,
positive
Crimping power interface,
negative
RS-485 interface, interface B
RS-485 interface, interface A
Description
8~28V DC, recommended 12V or 24V
The power supply negative pole is connected to the
system ground and the housing
The RS-485 interface B is connected to the device
interface B
The RS-485 interface A is connected to the device
interface A
E90-DTU （2G4L27） User Manual
11