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7
Modbus Instructions
Primary Data Tables
Table Data Type Read / Write
Discrete Inputs Single Bit Read Only
Coils Single Bit Read / Write
Input Registers 16-Bit Word Read Only
Holding Registers 16 Bit Word Read / Write
SYNC Boiler Memory Map
Coils
Address Description Default Unit Min. Max. Resolution
00001 Boiler Enable / Room Thermostat 1 / Stage 1 0 1=ON / 0=OFF 0 1 1
00005 Tank Thermostat 0 1=ON / 0=OFF 0 1 1
Discrete Inputs
10001 Manual Reset High Limit 1 0 1=ON / 0=OFF 0 1 1
10002 Flow Switch 1 0 1=ON / 0=OFF 0 1 1
10003 Gas Pressure Switch 1 0 1=ON / 0=OFF 0 1 1
10004 Louver Proving Switch 1 0 1=ON / 0=OFF 0 1 1
10005 Air Pressure Switch / Flap Valve 1 0 1=ON / 0=OFF 0 1 1
10006 Blocked Drain Switch 1 0 1=ON / 0=OFF 0 1 1
10007 Auto Reset High Limit 1 0 1=ON / 0=OFF 0 1 1
10008 Flame 1 0 1=ON / 0=OFF 0 1 1
10009 Enable / Room Thermostat 1 / Stage 1 0 1=ON / 0=OFF 0 1 1
10010 Tank Thermostat 0 1=ON / 0=OFF 0 1 1
10017 Manual Reset High Limit 2 0 1=ON / 0=OFF 0 1 1
10018 Flow Switch 2 0 1=ON / 0=OFF 0 1 1
10019 Gas Pressure Switch 2 0 1=ON / 0=OFF 0 1 1
10020 Louver Proving Switch 2 0 1=ON / 0=OFF 0 1 1
10021 Air Pressure Switch / Flap Valve 2 0 1=ON / 0=OFF 0 1 1
10022 Blocked Drain Switch 2 0 1=ON / 0=OFF 0 1 1
10023 Flame 2 0 1=ON / 0=OFF 0 1 1
10033 Run-time Contacts 0 1=ON / 0=OFF 0 1 1
10034 Alarm Contacts 1 0 1=ON / 0=OFF 0 1 1
10035 CH Pump 1 0 1=ON / 0=OFF 0 1 1
10036 DHW Pump 1 0 1=ON / 0=OFF 0 1 1
10038 Gas Valve 1 0 1=ON / 0=OFF 0 1 1
10039 System Pump 0 1=ON / 0=OFF 0 1 1
10041 Run-time Contacts 2 0 1=ON / 0=OFF 0 1 1
10042 Alarm Contacts 2 0 1=ON / 0=OFF 0 1 1
10043 CH Pump 2 0 1=ON / 0=OFF 0 1 1
10046 Gas Valve 2 0 1=ON / 0=OFF 0 1 1
3 Memory Map