8
Input Registers
Address
Description
Default
Unit
Min.
Max.
Resolution
30001
Discrete Inputs 1 - 16
0
N/A
0
65535
1
30002
Discrete Inputs 17 - 32
0
N/A
0
65535
1
30003
Discrete Inputs 33 - 48
0
N/A
0
65535
1
30004
System / Cascade Setpoint
0
Degrees Celsius
0
130
0,5
30006
Cascade Total Power
0
%
100
800
1
30007
Cascade Current Power
0
%
0
800
1
30009
Outlet Temperature
0
Degrees Celsius
0
130
0,1
30010
Inlet Temperature
0
Degrees Celsius
-20
130
0,1
30011
Flue Temperature
0
Degrees Celsius
-20
130
0,1
30012
Firing Rate
0
%
0
100
1
30014
Status Code
0
N/A
0
65535
1
30015
Blocking Code
0
N/A
0
65535
1
30016
Lockout Code
0
N/A
0
65535
1
30026
Discrete Inputs 49 - 64
0
N/A
0
65535
1
30027
Lockout Code Leader
0
N/A
0
65535
1
30028
Lockout Code Member 1
0
N/A
0
65535
1
30029
Lockout Code Member 2
0
N/A
0
65535
1
30030
Lockout Code Member 3
0
N/A
0
65535
1
30031
Lockout Code Member 4
0
N/A
0
65535
1
30032
Lockout Code Member 5
0
N/A
0
65535
1
30033
Lockout Code Member 6
0
N/A
0
65535
1
30034
Lockout Code Member 7
0
N/A
0
65535
1
Holding Registers
40001
Con
fi
guration
0
N/A
0
65535
1
40002
Coils
0
N/A
0
65535
1
40003
0-10 Volt Input / Rate Command / Setpoint
Command
0
%
0
100
1
40004
Tank Setpoint
0
Degrees Celsius
0
87,5
0,5
40005
Tank Temperature
0
Degrees Celsius
-20
130
0,1
Memory Map
3
ModBus Memory Map
Con
fi
guration Bits
Address 40001 contains confi guration bits sent from the BAS to the unit. Th
ese bits tell the unit to use its own internal inputs,
or inputs from the BAS. When a bit is set to 1, the unit will ignore the corresponding value contained internally, and expect the
BAS to write that value into the Holding Registers. Th
e confi guration bits are as follows:
Bit 3: Tank Setpoint
Bit 6: Tank Temperature
Bit 8 - 15: Not Used (Default = 0)
Bit 0 (LSB): Enable
Bit 1: Tank Th
ermostat
Bit 2: Rate Command / 10 - 10V Input / Setpoint Command
ModBus and BACnet Instructions
