7 Remote Control
Page 112 Mk8 MM Expansion Features Installation and Set-Up Guide 04.09.2016
7 REMOTE CONTROL
7.1 Overview
To access data remotely from the Mk8 MM, this can be done by either connecting to a MK7 DTI, or by
using direct Modbus. Direct Modbus cannot be used with sequencing or Mk7 DTI. The MM Direct
Modbus expansion feature must be unlocked.
To activate direct Modbus on the Mk8 MM, the Direct Modbus expansion software feature must be
unlocked. The activation code for the serial number of the MM will need to be purchased using part
number MK8006, and uploaded to the unit via Download Manager software.
Please see Autoflame PC Software Guide for more information on unlocking expansion features on the
Mk8 MM using Download Manager software.
There are a limited number of Modbus addresses available in the Mk8 MM, which can be accessed
directly without the need for a DTI.
When using Modbus direct e.g. connecting to Building Management System from the MM without a
DTI, then neither Autoflame Intelligent Boiler Sequencing nor the DTI can be used.
The MM communicates using an RS485 data link from terminals 27 (-ve) and 28 (+ve). Beldon 9501
data cable is recommended.
Up to 10 MMs can be linked to together and connected to a Building Management System via
terminals 27 and 28. Each Mk8 MM will need to be set with an individual Modbus device ID by setting
expansion option 104.
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.
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