TSBC Instruction Manual Page 26 of 48
Installation
RS485 Modbus Network
The TSBC includes a dependable Modbus communication network. This network allows boilers to be controlled and/or
monitored by a remote system via a RS485 Modbus communication network. Each TSBC is a Modbus slave with the
following available boiler information:
Modbus Addresses
Coil Address Description Read/Write coil = 0 coil = 1 Notes
00001
Outdoor Air Reset Enable/Disable
Disable Enable
00002
Domestic Hot Water Priority (DHWP)
Disable Enable
00003
Local / Remote
Local Remote
00004
Remote On / Off Modbus Command
Y
Off On 1
00005
Spare Input (Programmable)
Off On
00006
Low Water Cutoff Switch
Off On 2
00007
Burner On / Off Switch
Off On 2
00008
Low Water Flow
Off On 2
00009
High and Low Gas Pressure Switches
Off On 2
00010
Operating or High Limit
Off On 2
00011
Low Combustion Air Flow
Off On 2
00012
Fuel Valve Energized
Off On
00013
Flame Safeguard Alarm
Off On
00014
Call For Heat (CFH)
Off On
00015
General Alarm
Off On 4
00016
Vent Inducer
Off On
00017
Boiler Pump
Off On
00018
System Pump
Off On
00019
Spare Output (Programmable)
Off On
00020
State Boiler Disabled
Off On 3
00021
State Weather Shutdown
Off On 3
00022
State Lockout
Off On 3
00023
State Pump Purge
Off On 3
00024
State Limit Hold
Off On 3
00025
State Purge/Pilot Ign
Off On 3
00026
State Low Fire/Ignition
Off On 3
00027
State Main Ignition
Off On 3
00028
State Low Fire Hold
Off On 3
00029
State Boiler Running
Off On 3
00030
State Fan Post Purge
Off On 3
00031
State Pump Cool Down
Off On 3
00032
State Standby
Off
On
3
00033
Annunciator Low Water Level
Off
On
4
00034
Annunciator Off Switch
Off
On
4
00035
Annunciator Low Water Flow
Off
On
4
00036
Annunciator Fuel Limit
Off
On
4
00037
Annunciator High Temp Limit
Off
On
4
00038
Annunciator Low Air Flow
Off
On
4
00039
Annunciator FSG Lockout
Off
On
4
00040
Annunciator Outlet Temp Fail
Off
On
4
00041
Annunciator Inlet Temp Fail
Off
On
4
00042
Annunciator OA Temp Fail
Off
On
4
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