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Modbus Address - This is the address of a specific SYNC
boiler. This address is set by dip switches on the Modbus
communication board. The value displayed here should
be the same as the value of the dip switches. The Building
Automation System should use this address to communicate
with the boiler.
Boiler Enable - This displays the enable status that has been
transmitted to the boiler by the Building Automation System.
Boiler State - This displays the state code of the boiler. Please
reference the SYNC Modbus Instruction Manual for a full
definition of each code.
Boiler Command - This displays the value written to register
40003 of the Modbus communication board by the Building
Automation System. The value is displayed as the percent of
firing rate, 80 = 80% firing rate.
Effective Setpoint - This displays the value written to register
40003 of the Modbus communication board by the Building
Automation System. The value is displayed as the effective
setpoint in degrees (°F or °C).
Note: The boiler can be configured to operate off the boiler
command or the effective setpoint. The boiler configuration
determines which value is meaningful.
The Building Screen displays information that is specific to the Building Automation System and is being transmitted through
the Modbus communication link:
Service Manual