Thermal Solutions APEX APX425C User Manual

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106308-05 - 3/23
APEX Installation, Operating, & Service Instructions
4. Modbus Register List
A list of available Modbus registers and descriptions is stored in the display and provided in Table 10-26. To access
Select
to access the list of available Modbus registers.
Table 10-26: Modbus Register List
ENABLE/DISABLE
Modbus
Register
Protocol
Name Description
Read (R) /
Write (W)
400577
Central Heat
Enable/Disable
Central Heat Enable/Disable
0 = Disable
1 = Enable
When this register is not written every “Modbus Command Time Out” parameter
seconds (default 30 seconds), CH Modbus Stat is reverted to 0 no demand.
W
400563 LLCH Modbus Stat
LL CH Modbus STAT
0 = no demand
1 = demand
When this register is not written every “Modbus Command Time Out” parameter
seconds (default 30 seconds), CH Modbus Stat is reverted to 0 no demand.
W
400203 Burner on/off
Burner On/Off burner.
1 = on
0 = off
R
400006 Demand source
0 = Unknown
1 = No source demand
2 = Central heat
3 = Domestic hot water
4 = Lead Lag slave
5 = Lead Lag master
6 = Central heat frost protection
7 = Domestic hot water frost protection
8 = No demand due to burner switch turned off
9 = Domestic hot water storage
11 = Warm weather shutdown
R
400066 CH heat demand
0=Off,
1=On
R
400083 DHW heat demand
0=Off,
1=On
R
400123
Low Temperature
Loop heat demand
0=Off,
1=On
R
SETPOINTS
410579
CH Modbus
Setpoint
Use this register to change the boiler setpoint.
When this register is not written every “Modbus Command Time Out” parameter
seconds (default 30 seconds), setpoint reverts to local setpoint
valid range 60°F to 190°F
W
410562
CH Sequencer
Modbus Setpoint
Use this register to change the multiple boiler Sequencer setpoint.
When this register is not written every “Modbus Command Time Out” parameter
seconds (default 30 seconds), setpoint reverts to local setpoint
valid range 60°F to 190°F
W
410211 CH setpoint Status of local setpoint R
410453 DHW setpoint Status of local setpoint R
410546 Lead Lag setpoint Status of local setpoint R
410212 CH TOD setpoint Status of local setpoint R
10 Operation (continued)

Thermal Solutions APEX APX425C Specifications

General

Brand	Thermal Solutions
Model	APEX APX425C
Category	Boiler
Language	English