6.3 Setup and Configuration
Up to 10 MMs can be linked together and connected to any Management System that supports Modbus protocol
via terminals 27 and 28. Each Mk8 MM needs to be set with an individual Modbus Device ID in expansion option
104.
The following expansion options need to be set on the Mk8 MM for to configure Direct Modbus.
The MM communicates using an RS485 data link from terminals 27 (-ve) and 28 (+ve), the connection must be
screened from the MM side only. Belden 9501 data cable is recommended for the communication.
The following terminals are used for Direct Modbus.
The maximum block of addresses the MM can read and write to is 127, as per Modbus having a built-in limit of
255 byte packets.
If the MM does not receive any Modbus commands for 60 seconds, the Modbus goes ‘offline.’ You can keep the
Modbus ‘online’ with a simple instruction, such as polling or setting a single value to that individual MM. If the
Modbus is ‘offline’ then remote setpoint and firing rate set via Modbus will be disabled. The only exception is the
enable/disable burner which changes the enable/disable button on the MM on the home screen, as this change
will last until the Modbus state is changed again or the enable/disable button is pressed again.
If the MM is powered off or the communications is lost, the Modbus address values from the unit will not be true.
Please check the Modbus settings on your Modbus device before configuring it with the Mk8 MM.
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