Rev 3.1 01/11/23 - 23 - Model 600 User Guide
OSA sensor can be used on one device and be sent to other Model 600 units by the Modbus polling
agent.
6.3 Operational Cooling Setpoint
Modbus holding register 102 is used to display the current cooling setpoint. This will either be the
locally stored value, or a polling agent can write a value to this register. Write the desired cooling
setpoint to this register when you want to coordinate Lead/Lag operation between multiple units and or
change the setting based on time or occupancy. Writing a value of 65535 will cause the Model 600 to
use the locally stored value of Modbus register 1100.
6.4 Operational Econ Setpoint
Modbus holding register 103 is used to display the current economizer cooling setpoint. This will either
be the locally stored value, or a polling agent can write a value to this register. Write the desired econ
cooling setpoint to this register when you want to coordinate Lead/Lag operation between multiple
units and or change the setting based on time or occupancy. Writing a value of 65535 will cause the
Model 600 to use the locally stored value of Modbus register 1101.
6.5 Operational Heating Setpoint
Modbus holding register 104 is used to display the current heating setpoint. This will either be the
locally stored value, or polling agent can write a value to this register. Write the desired heating
setpoint to this register when you want to coordinate Lead/Lag operation between multiple units and or
change the setting based on time or occupancy. Writing a value of 65535 will cause the Model 600 to
use the locally stored value of Modbus register 1104.
6.6 Comfort Mode
Modbus holding register 107 is used to remotely set the unit into comfort mode. Write a 1 to enable
comfort mode which will then timeout based up the defined comfort mode time. Write a 0 to disable
comfort mode.
6.7 Lead Switch Request
Modbus holding register 108 is used to which HVAC unit is the current lead system. Writing a value
greater than zero will switch the lead unit. Writing a 0 will resume local operation.
6.8 Econ Disable
Holding register 109 is used to disable the economizer mode on a Model 600. Writing a value greater
than 0 will disable economizer operation. Writing a 0 to the register will allow the Model 600 to
continue economizer operation as needed.
6.9 HVAC Shutdown
Holding register 110 is used to force both HVAC units to off mode. Writing a value greater than zero will
force off the HVAC units. Writing a 0 will resume local operation.
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