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4. Interface definition
Power supply
4.1.
Users can choose ① the VCC and GND terminal power supply, E800-DTU can use 8~ 28V DC power supply,
but it is recommended to use 12V or 24V DC power supply.
RS485 interface
4.2.
E800-DTU can use the 485_A terminal and the 485_B terminal in ② to connect the A terminal and the B terminal of the RS-485
of the device respectively.
Pin NO.
Definition
1
VCC
2
GND
3
GNDA
4
B/TXD
5
A/RXD
Note: The DTU will be in poor communication when connecting multiple devices , while connecting a single
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Function
Screwing power interface,
positive
Screwing power interface,
negative
RS232 common terminal
Serial port terminal
Serial port terminal
E800-DTU(433Lxx-485)-V8 UserManual
Description
8 ~ 28V DC, 12V or 24V( recommended )
The power supply negative pole is connected to
the system ground and the housing
Connected to RS 232 device GND
RS-485: Connected to RS 485 device interface
B
RS-232: Output terminal,connected to RS 232
device RXD
RS-485: Connected to RS 485 device interface
A
RS-232: Input terminal, connected to RS 232
device TXD
6
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