MODBUS Installation and Operation Manual
15
HT# 059266-00A
SrC reg /
VarIaBle#
DeSCrIPTIOn
MUlT
(if not 1)
UOM
range / STaTeS / SPeCIal
ValUeS
reaD
Only
102
System Sensor Trim
°C, °F
-3 – +3°C, -5 – +5°F
103
Valve Position
%
0 – 100
X
104
Valve Close Overdrive
Seconds
0 – 90
105
Valve Close Trim
%
0 – 5
106
Valve Mode
0=Positioning
Sensor,1=Time-Based
107
Valve Open Trim
%
0 – 5
108
Valve Trim
%
0 – 20
109
District Steam Delay
Minutes
0 – 30
110
System Setpoint
°C, °F
21 – 122°C, 70 – 250°F
SrC Platinum notes
♦1
If specified, divide a read value by this to obtain the actual value – Multiply desired value by this before writing .
♦2
For variables that specify them, if a read value is a special value (32000 - 32005), do not divide by ‘MULT' .
♦3
Strings are packed 2 characters per register, most significant byte first .
♦4
Multi-register values are stored
big endian
(first register x 65536 + second register = value) .
note:
All variables are stored as ‘Holding Registers’ . MODBUS functions :
• ‘Read Holding Registers’ (function code 3),
• ‘Write Single Register' (function code 6),
• and ‘Write Multiple Registers’ (function code 16) are supported .
note:
All variables with multiple UOM’s depend upon the value of ‘Input Mode’ to determine which to use .
note:
Use 'District Steam Delay' when 'Operating Mode' is set to District Steam . Use 'System Setpoint', 'System
Differential' and 'Thermal Lockout Enable' when 'Operation Mode' is set to Burner/valve .
note:
Use 'Vari-Boost Adjustment' when 'Boost Mode' is set to Vari-Day or Vari+ESD . Use 'Manual Boost Time' when
'Vari-Boost Adjustment' is set to Manual Boost .
note:
The SRC Platinum has a schedule, which is 7-days, 4 day/night pairs per day . For example: Register
38 is the first DAY schedule of Monday; Register 39 is the first NIGHT schedule of Monday; Register 46
is the first DAY schedule of Tuesday; Register 47 is the first NIGHT schedule of Tuesday and so on .
note:
Use SRC Platinum Installation and Operation manual for supplementary information .
