7
DIP Switches
Terminal block
VII. Product interface definition
Pin
Pin name
Definition
1
GND
Grounding
2
AI
1
Analog input 1 –
External temperature sensor
3
AI2
Analog input 2
4
NO4
Relay normal open
-
HF
5
NO3
Relay normal open
-
MF
6
NO2
Relay normal open
-
LF
7
NO1
Relay normal open–
ON/OFF
8
B2
Modbus slave B
9
A2
Modbus slave A
10
B1
Modbus host B
11
A1
Modbus host A
12
GND
Grounding
13
Vin
9
-
24V DC input
14
Vout
9
-
24V DC output
Switch
Number
Switch Definition
ON
OFF
1
Modbus terminal resistor
2
Modbus slave position [3]
3
Modbus slave position [2]
4
Modbus slave position [1]
5
Modbus slave position [0]
6
Maximum wind speed [1]
7
Maximum wind speed [0]
8
Control mode selection
*
The above are the default states of DIP switches
Table 1. Terminal block pin function definition
Table 2. DIP switch function definition
VIII. Wiring diagram
–
Connecting to the central control unit
The central control unit can read the sensor data of UNOnext and the status of the ventilation equipment via the RS485
physical line and the Modbus RTU protocol