Service manual

4 Memory Map
ModBus Communication Instructions
10
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
Memory Map
Coils
Address Description Default Unit Min. Max. Resolution
00001 Room Thermostat 1 0 1=ON / 0=OFF 0 1 1
00002 Room Thermostat 2 0 1=ON / 0=OFF 0 1 1
00003 Room Thermostat 3 0 1=ON / 0=OFF 0 1 1
00005 Tank Thermostat 0 1=ON / 0=OFF 0 1 1
Discrete Inputs
10002 Flow Switch 0 1=ON / 0=OFF 0 1 1
10003 Gas Pressure Switch 0 1=ON / 0=OFF 0 1 1
10004 Louver Proving Switch 0 1=ON / 0=OFF 0 1 1
10005 Air Pressure Switch 0 1=ON / 0=OFF 0 1 1
10006 Blocked Drain Switch 0 1=ON / 0=OFF 0 1 1
10007 Auto Reset High Limit 0 1=ON / 0=OFF 0 1 1
10008 Flame 0 1=ON / 0=OFF 0 1 1
10009 Room Thermostat 1 0 1=ON / 0=OFF 0 1 1
10010 Tank Thermostat 0 1=ON / 0=OFF 0 1 1
10024 Room Thermostat 2 0 1=ON / 0=OFF 0 1 1
10033 Run-time Contacts 0 1=ON / 0=OFF 0 1 1
10034 Alarm Contacts 0 1=ON / 0=OFF 0 1 1
10035 CH Pump 0 1=ON / 0=OFF 0 1 1
10036 DHW Pump 0 1=ON / 0=OFF 0 1 1
10038 Gas Valve 0 1=ON / 0=OFF 0 1 1
10039 System Pump 0 1=ON / 0=OFF 0 1 1