Lochinvar Armor 101 Series, Instructions Manual, Page: 19 / 28

19
ModBus and BACnet Instructions
7
Unit Operation
(continued)
Demand Con fi guration: ENABLE = INACTIVE; BMS = ACTIVE
In this confi guration the unit is controlled by setting the modulation setpoint from 0 - 100%, or the setpoint. Th e setpoint
command will be determined by the parameters in the control.
Rate command will be 0 - 100% of the modulation range.
All sensors and limiting devices should be hardwired to the terminal strip on the back of the unit excluding the 0 - 10Vdc signal.
Th
is signal will be sent to the unit via ModBus or BACnet.
Th e holding registers will need to be set as follows:
For proper hexadecimal conversion of rate percentage, please refer to the Rate and Temperature Conversion section on page 17
of this manual.
Demand Con fi guration: ENABLE = ACTIVE; BMS = ACTIVE
In this confi guration the unit is controlled by providing an enable signal. Th e setpoint command will be determined by the
parameters in the control and a rate command through ModBus or BACnet communications.
Th e rate command will be 0 - 100% of modulation.
All sensors and limiting devices should be hardwired to the terminal strip on the back of the unit excluding the enable and 0-10V
BMS signal. Th
ese signals will be sent to the unit via ModBus or BACnet.
Th e holding objects or registers will need to be set as follows:
For proper hexadecimal conversion of rate percentage, please refer to the Rate and Temperature Conversion section on page 17
of this manual.
NOTE: To ensure proper operation re-send the confi guration bits to holding register 40001 or Object AV0 prior to issuing a
command.
Object Holding Registers De fi nition Bit Value (HEX) Action
AV0 40001 Confi guration 00 05 Set Confi guration to read 40002 & 3
AV1 40002 Coils 00 01 Enables unit (00 00 disables unit)
AV2 40003 Rate Command 00 ## Sets Modulation % or Setpoint
NOTE: To ensure proper operation re-send the confi guration bits to holding register 40001 or Object AV0 prior to issuing a
command.
Object Holding Registers De fi nition Bit Value (HEX) Action
AV0 40001 Confi guration 00 04 Set Confi guration to read 40003
AV2 40003 Rate Command 00 00 Sets Modulation % or Setpoint