Chengdu Ebyte Electronic Technology Co., Ltd.
Copyright©2012–2021,Chengdu Ebyte Electronic Technology Co., Ltd.
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4. Interface definition
4.1.
Power interface
Users can choose
⑥
DC power interface,using the power adapter supply with the interface of the 5.5mm outer diameter , 2.5mm
diameter ;
Also users can choose the VCC and GND terminal power supply from
②
, both are optional
；
8 ~ 28V DC power supply, it is recommended to use 12V or 24V DC power supply for E90-DTU.
4.2.
RS232
The E90-DTU can be connected to the device via RS-232 using the standard DB-9 interface.
4.3.
RS485
E90-DTU can be connected to the 485_A terminal and 485_B terminal from
②
with the RS-485 A terminal and B terminal of
other device respectively.
Pin No.
Definition
Function
Description
1
VCC
Crimping power interface, positive
8 ~ 28V DC, recommended 12V or 24V
2
GND
Crimping power interface, negative
The power supply negative pole is connected to the system
ground and the housing
3
485_B
RS-485 interface, interface B
The RS-485 interface B is connected to the device interface B
4
485_A
RS-485 interface, interface A
The RS-485 interface A is connected to the device interface 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.
