14 Direct Modbus
Mk8 MM Manual Page | 256
14.4 Modbus Addresses
There are 4 types of Modbus addresses:
0x Read/Write Digital outputs – off/on commands
These are binary values and have a 0/1
value indicating an off/on or no/yes value.
1x Read Digital inputs – off/on signals/indications
3x Read Analogue inputs – variable data in
These are multiple integer values and can
have a value of 0 to 65534 and do not
contain decimal points i.e. channel 1
position Modbus value is 900 which is
equivalent to 90.0°.
4x Read/Write Analogue outputs – variable adjustments
# Type Description Details
1 = Burner is disabled
Value changes state of enable/disable button on MM
home screen; changes are kept if MM loses comms with
Modbus device sending commands
0 = Running interlock (T53) is off
1 = Running interlock (T53) is on
1 = Trim optioned
Returns value 0 when option 12 is set for monitoring only.
1 = EGA is trimming
Returns value 0 is actual temperature/pressure is below
1 = Cooler is not ready
Returns value 0 if EGA is in error state
0 = Temperature OK
1 = Temperature not OK
2
2
1 = NO
2
cell optioned
See option 36, valid for Mk7 EGA only
2
2
1 = SO
2
cell optioned
See option 36, valid for Mk7 EGA only
0 = EGA is not sampling
1 = EGA is sampling
0 = MM not in hand mode
1 = MM in hand mode
0 = MM not in low flame hold
1 = MM in low flame hold
1 = Burner disabled
Returns state of enable/disable button on MM home
screen and same value as address 00001
0 = Water level not optioned
1 = water level optioned
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