IMO Precision Controls i3 Tutorial page 5

The Modbus master protocol utilises the Modbus function codes 03 to read single and
multiple registers, 10 to write to multiple registers and 06 to write to single registers.
Most Modbus slave devices only use the function codes 03 to read and 06 to write.
3
Therefore the i can communicate with any Modbus enabled device.
Now the protocol has been selected the 3 buttons can now be selected. Start by setting
up the network.
The network has to match the slowest device, so checking the equipments'
capabilities before setting up the network is essential. All devices on the network must
be configured to the same parameters.
In this small example the Network parameters to suit all devices will be:
Baud Rate = 9600, RS485 (Half Duplex), Modbus RTU, 8 data bits, 2 stop bits.
Protocol
help can be
accessed
here by
pressing
the button.
Once
complete
please click
the OK
button.
www.imopc.com 5
To see the
status of
the network
assign a
%R register
here.