User Manual

Chengdu Ebyte Electronic Technology Co.,Ltd
E32-DTU User Manual
6
4. Interface definition
4.1. Power supply Interface
You can select the
DC power adapter, which provides power with an external diameter of 5.5mm and an internal diameter of
2.5mm.
The VCC terminal and GND terminal in
can also be used for power supply, just select either of the power supply modes.
E32-dtus can use 8 to 28V DC power supplies. 12V or 24V DC power supplies are recommended.
4.2. RS232 interface definition
The E32-DTU can be connected to the device via RS-232 using a standard DB-9 interface.
4.3. RS485 Interface definition
The E32-DTU can connect terminals 485_A and 485_B in step 2 to terminals A and B of RS-485.
Pin
Standard
definition
Function
Description
1
VCC
Press-line power interface,
positive pole
Dc ranges from 8V to 28V. 12V or 24V is recommended
2
GND
Press-line power interface,
negative terminal
The negative terminal of the power supply is connected
with the system and the housing
3
485_B
RS-485 port, port B
RS-485 Port B Connects to port B on the device
4
485_A
RS-485 port, port A
RS-485 Port A Port A connects to port A of the device
Note: Communication failure occurs when the radio station is connected to multiple devices, but does not occur when the radio
station is connected to a single device. Connect terminals 485_A and 485_B in parallel with 120Ω resistance.