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ERV
SYSTEM MONITORING
12.8 MODBUS REGISTER LIST
Modbus Registers with an offset of 0 have been duplicated at register 98 to accommodate
Automated Logic Systems and other systems that cannot map 0.
TYPE
#
VARIABLE
DESCRIPTION
RANGE
READ/WRITE
MODE (RET)
Coil
0
OnOffUnitMng.BmsOnOff
BMS On/Off Command
Off/On
Read_Writeable
Coil
1
OnOffUnitMng.BmsEfOnly
BMS Exhaust Fan Only Command Off/On
Read_Writeable
Coil
2
AlarmMng.AlrmResByBms
Alarm Reset BMS Command
OK/Reset
Read_Writeable
Coil
4
BMS_SetHeatCool
BMS Set Heat/Cool Capability
No/Allow
Read_Writeable (X)
Coil
5
BMS_HeatCoolMode
BMS Heat/Cool Mode Setting
Heat/Cool
Read_Writeable (X)
Coil
3
OnOffUnitMng.BmsUnocc
BMS Unoccupied Command
Occ/Unocc
Read_Writeable
Coil
6
BMS_HW_Valve_Control
BMS HW Valve Control
No/Allow
Read_Writeable
Coil
7
Heating_Enable_1.Val
Heating Stage 1 BMS Enable
Off/On
Read_Writeable
Coil
98
OnOffUnitMng.BmsOnOff
BMS On/Off Command
Off/On
Read_NoWrite
DiscreteInput
0
OA_Damp.Val
OA Damper Command
Closed/Open
Read_NoWrite
DiscreteInput
1
RA_Damp.Val
RA Damper Command
Closed/Open
Read_NoWrite
DiscreteInput
16
Tempering_Mode.Val
Tempering Mode
Heat/Cool
Read_NoWrite
DiscreteInput
2
AlarmMng.AlrmRes
Alarm Reset Status
No/Yes
Read_NoWrite
DiscreteInput
3
SF_Status.Val
SF Status from Current Sensor
Off/On
Read_NoWrite
DiscreteInput
4
EF_Status.Val
EF Status from Current Sensor
Off/On
Read_NoWrite
DiscreteInput
5
Alarm_Out.Val
Serious Alarm (Also a physical
output)
OK/Alarm
Read_NoWrite
DiscreteInput
6
Heating_Enable_1.Val
Heating Stage 1
Off/On
Read_NoWrite
DiscreteInput
7
Cooling_Stage_1.Val
Cooling Stage 1
Off/On
Read_NoWrite
DiscreteInput
8
Cooling_Stage_2.Val
Cooling Stage 2
Off/On
Read_NoWrite
DiscreteInput
9
UnitOn
Unit On Status
Off/On
Read_NoWrite
DiscreteInput
10
OfflineAlrm_CPCOE_1.Active Device offline alarm CPCOE
OK/Alarm
Read_NoWrite
DiscreteInput
21
Al_SupplyFan.Active
Supply Fan Start Alarm
OK/Alarm
Read_NoWrite
DiscreteInput
22
Al_ExhaustFan.Active
Exhaust Fan Start Alarm
OK/Alarm
Read_NoWrite
DiscreteInput
12
Bypass_Damp.Val
Bypass Damper Command
Close/Open
Read_NoWrite
DiscreteInput
13
Heating_Enable_2.Val
Heating Stage 2
Off/On
Read_NoWrite
DiscreteInput
20
Any_Alarm_Out.Val
Any Alarm is True Status
OK/Alarm
Read_NoWrite
DiscreteInput
98
OA_Damp.Val
OA Damper Command
Closed/Open
Read_NoWrite
HoldingRegister
44
HeatingCommand_BMS
Heating Command from BMS
%
Read_Writeable
HoldingRegister
0
RA_Flt_AlarmHigh
RA Filter Alarm Level
iwc
Read_Writeable (X)