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Chapter Four Interface Definition
4.1 Power Interface Description
The user can choose
⑥
DC power interface to supply power, and use the interface to supply power for a power adapter with an
outer diameter of 5.5mm and an inner diameter of 2.5mm;
It can also be powered by the VCC terminal and GND terminal in
②
, just choose any one of the power supply methods;
E78-DTU can be powered by 8~28V DC power supply, 12V or 24V DC power supply is recommended.
4.2 RS485 interface definition
E78-DTU ( 900 LN22) can use the 485_A terminal and 485_B terminal in
②
to connect to the A terminal and B terminal of the
RS-485 of the device respectively.
Pin
number
Standard
definition
Features
Explanation
1
VCC
Crimp type power interface,
positive
DC 8~28V, 12V or 24V is recommended
2
GND
Crimp type power interface,
negative pole
The negative pole of the power supply is connected to
the system ground and the shell
3
485_B
RS485 interface, B interface
RS485 interface B interface is connected with device B
interface
4
485_A
RS485 interface, A interface
RS485 interface A interface is connected with device A
interface
