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8
Modbus Instructions
Input Registers
Address Description Default Unit Min. Max. Resolution
30001 Discrete Inputs 1 - 16 0 NA 0 65535 1
30002 Discrete Inputs 17 - 32 0 NA 0 65535 1
30003 Discrete Inputs 33 - 48 0 NA 0 65535 1
30004 System / Cascade Setpoint 0 Degrees Celsius 0 130 0,5
30006 Cascade Total Power 0 % 100 800 1
30007 Cascade Current Power 0 % 0 800 1
30008 Outlet Setpoint 1 0 Degrees Celsius 0 130 0,5
30009 Outlet Temperature 1 0 Degrees Celsius 0 130 0,1
30010 Inlet Temperature 1 0 Degrees Celsius -20 130 0,1
30011 Flue Temperature 1 0 Degrees Celsius -20 130 0,1
30012 Firing Rate 1 0 % 0 100 1
30014 Boiler 1 Status Code 0 NA 0 65535 1
30015 Boiler 1 Blocking Code 0 NA 0 65535 1
30016 Boiler 1 Lockout Code 0 NA 0 65535 1
30017 Outlet Setpoint 2 0 Degrees Celsius 0 130 0,5
30018 Outlet Temperature 2 0 Degrees Celsius 0 130 0,1
30019 Inlet Temperature 2 0 Degrees Celsius -20 130 0,1
30020 Flue Temperature 2 0 Degrees Celsius -20 130 0,1
30021 Firing Rate 2 0 % 0 100 1
30023 Boiler 2 Status Code 0 NA 0 65535 1
30024 Boiler 2 Blocking Code 0 NA 0 65535 1
30025 Boiler 2 Lockout Code 0 NA 0 65535 1
Holding Registers
40001 Configuration 0 NA 0 65535 1
40002 Coils 0 NA 0 65535 1
40003
0-10 Volt Input / Rate Command /
Setpoint Command
0 % 0 100 1
40004 Tank Setpoint 0 Degrees Celsius 0 87,5 0,5
40005 Tank Temperature 0 Degrees Celsius -20 130 0,1
40006 Outdoor Temperature 0 Degrees Celsius -40 60 0,1
40007 System Supply Temperature 0 Degrees Celsius -20 130 0,1
SYNC Boiler Memory Map
3 Memory Map
Configuration Bits
Address 40001 contains configuration bits sent from the BAS to the boiler. These bits tell the boiler to use its own internal inputs,
or inputs from the BAS. When a bit is set to 1, the boiler will ignore the corresponding value contained internally, and expect the
BAS to write that value into the Holding Registers. The configuration bits are as follows:
Bit 4: System Supply Temperature
Bit 5: Outdoor Temperature
Bit 6: Tank Temperature
Bit 7: System Return Temperature
Bit 8 - 15: Not Used (Default = 0)
Bit 0 (LSB): Boiler Enable
Bit 1: Tank Thermostat
Bit 2: Rate Command / 10 - 10V Input / Setpoint Command
Bit 3: Tank Setpoint