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Systemair NOVA drive 370
10 Modbus control
10.1 Control
As soon as a valid message is received trough Modbus, NOVA will switch from analog to Modbus communication and
will continue operating in this manner until power is reset.
10.2 Connection
The interface to Modbus follows:
Interface RS485
Baudrate 9600
Data bits 8
Parity None
Stop bits 1
Default address 7
Table 3 – Modbus connection details
10.3 Addressing
The default address for the inverter is 7. The address can be changed trough Modbus. To change the address follow
the following steps:
1. Connect to the inverter using the current address
2. Change the address in register 0x4F to the desired one
3. Wait 10 seconds
4. Turn off the device (wait 60 seconds)
5. Turn on the device
6. You can connect using the new address specified in point 2
7. If unknown address has been set. A Modbus scan tool must be used to find the set address
10.4 Modbus registers
The following Modbus registers are available. All the registers are either input registers (16-bit read-only denoted by R)
or holding registers (16-bit read-write denoted by RW).
Register Address Type Description
Backwards compatible control
Operation 0x01 RW Bit 0: Run(1) / Stop(0)
Bit 3: Clear fault (it can be combined with Run)
SpeedSet 0x02 RW Speed set 0-100%, written 0-1000 for quantification
SupplyVoltage 0x03 R DC link voltage in [V]
FaultContents 0x04 R Bits are set for each fault according to Table 9
OutputSpeed 0x05 R Estimated motor speed in [rpm]
OutputVoltage 0x06 R Motor RMS voltage in [V]
OutputCurrent 0x07 R Motor RMS current in [mA]
OutputPower 0x08 R Motor power in [W]
InputPower 0x09 R Added for compatibility reasons. Same as OutputPower
AccOperationTime 0x0A R Total time the motor has been running x10 in hours. A value of 5
for example means 50 hours.
MaxSpeed 0x0B R Max speed as set in [rpm]
MinSpeed 0x0C R Min speed as set in [rpm]
SW version 0x0D R Backwards compatible SW version, always increasing
HW version 0x0E R HW version of PCB
Application type 0x0F R Application type, for backwards compatibility, set as 0
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