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MODBUS REGISTERS AND FUNCTION CODES
The device supports the following Modbus registers and function codes. The parameter memory durability allows at least 1 million writing
cycles.
Supported MODBUS functions:
0x01
Read Coils
0x02
Read Discrete Inputs
0x03
Read Holding Registers
0x04
Read Input Registers
0x05
Write Single Coil
0x06
Write Single Register
0x0F
Write Multiple Coils
0x10
Write Multiple Registers
0x17
Read/Write Multiple Registers
NOTE: If you try to write a parameter value that is beyond the parameter value range, the value will be replaced by the nearest acceptable
value. For example, if you write 270 to the register 40011, the value will be replaced by 260.
Register
Parameter description
COILS
Cooling PWM overdrive enable (A1)
1
Cooling 0-10V overdrive enable (Y3)
2
Heating PWM overdrive enable (A2)
3
Heating 0-10V overdrive enable (Y4)
4
VAV overdrive enable (Y1)
5
FAN overdrive enable (Y2)
6
On/Off damper overdrive enable (B1)
7
Light control overdrive enable (B2)
8
Overdrive On/off damper by Modbus (B1)
9
Overdrive Light control by Modbus (B2)
10
SERVICE ALARM RESET
11
Cooling disabled
12
Heating disabled
13
NIGHT MODE
14
Cooling output mode (0:DIR, 1:REV)
15
Heating output mode (0:DIR, 1:REV)
16
Number of cooling stages (0:1 stage, 1:2 stages)
17
Sequence of cooling stages (0:Valve first , 1:VAV first)
18
Fan stage simultaneously with valve stage
19
Night operation mode (0:Dead zone, 1:Frost guard)
20
Effective set point after night mode to day mode change
21
(0:User, 1:Modbus)
Valve jam prevention
22
Fan type (0: 3-speed, 1:EC)
23
Fan speed 3 disabled
24
Effective fan speed after night mode to day mode change
25
(0:User, 1:Modbus)
VAV for heating
26
Display (0:temperature, 1:Set point)
27
DI2 operation direction (0:NC, 1:NO)
28
Thermostat function, cooling (0: P/PI, 1:thermostat)
29
Thermostat function, heating (0: P/PI, 1:thermostat)
30
Produal Oy
Keltakalliontie 18, 48770 Kotka FINLAND
Tel: +358-5-230 9200 / Fax: +358-5-230 9210
Data Type
Value
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
Bit
Off=0, On=1
info@produal.fi
USER GUIDE
HLS 44
18 (20)
Range
Default
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
1
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
0
Off - On
1
Off - On
0
Off - On
0
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