Ebyte E820-AIO User Manual page 8

Pin Definition
1 DC8-28V
2 AI-
3 AAI-
4 RS485_B
5 RS485_A
6 AI1+
7 AI1-
8 AI2+
9 AI2-
10 AI3+
11 AI3-
12 AI4+
13 AI4-
14 AI-
15 OUT-DC
2.2 Connection method
2.2.1 RS485 connection method
Function
Pressing line power input positive
Pressing line power input negative
Communication common ground
Interface B of RS-485
Interface A of RS-485
Analog signal input channel 1 positive
Analog signal input channel 1
negative
Analog signal input channel 2 positive
Analog signal input channel 2
negative
Analog signal input channel 3 positive
Analog signal input channel 3
negative
Analog signal input channel 4 positive
Analog signal input channel 4
negative
Power supply output negative
Power supply output positive
Power input, range: DC10-28V.
Power supply AI-.
When communicating with RS485, the DTU won't be used, while when
communicating with RS232, it will be grounded.
Interface B of RS-485 connected to Device B.
Interface A of RS-485 connected to Device A.
Input pin of analog signal forms the input with the AI1-.
To be used in pairs with AI1+.
Input pin of analog signal forms the input with the AI2-.
To be used in pairs with AI2+.
Input pin of analog signal forms the input with the AI3-.
To be used in pairs with AI3+.
Input pin of analog signal forms the input with the AI4-.
To be used in pairs with AI4+.
The negative internal of power supply connected to AI-.
Power supply output, the voltage is decided by the pin 1 (internal connecting to
pin 1).
8
Description
12V, and 24V are recommended.