Daikin DCOM-LT/MB [6/10] Dcom lt mb reference manual
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Daikin DCOM-LT/MB [6/10] Dcom lt mb reference manual

Daikin DCOM-LT/MB [6/10] Dcom lt mb reference manual
6 DCOM-LT/MB Reference Manual
English
DESCRIPTION OF OPERATION
The DCOM-LT/MB is a control interface for Daikin Altherma
units, refer to Daikin documentation on the Daikin Altherma
model and the controller compatibility. Refer to the DCOM-
LT/MB Reference Manual for a complete guide to DCOM
Modbus Networking.
MODBUS PROTOCOL
The DCOM Modbus Protocol has the following conguration
Network EIA-RS485 2-wire
Protocol Modbus RTU
Conguration 9600 baud, 8 data bits, 1 stop bit
Register Base 0
Register Types Analog Holding, Analog Input
FUNCTION CODES
The following function codes are supported by the interface.
For each code the maximum number of registers that can be
read/or written is listed.
Function Type
Function
Code
Maximum
Count
Input Register Read 4 64
Holding Register Read 3 64
Single Holding Register Write 6 1
Multiple Holding Register Write 16 64
SPECIAL RETURN VALUES
In cases where data is not currently available, or a register is
not supported in the current device conguration, a number
of special return values are assigned. These values will be
returned if the Modbus register is read as a signed or unsigned
16 bit value.
Return
Value
Meaning Description
32767 Register Unsupported Device does not
support requested
register
32766 Register Unavailable Requested register
is not available in
current conguration
32765 Wait for value Requested register
value is not loaded
If the DCOM is timed out or synchronising with the Altherma
master, values will return Wait for value until the value is
loaded.
DATA TYPES
DCOM Modbus registers return data in the formats listed in
the following table.
Data Type Signed Bits Scaling Range
temp16
signed 16 / 100 -327.68 .. 327.67
int16
signed 16 none -32768 .. 32767
text16
unsigned 16 none 2 ASCII
Characters
HOLDING REGISTERS
Register
O󰀨set
Name Type Range
1 Leaving Water Main
Heating Setpoint
int16
25 .. 55ºC
2 Leaving Water Main
Cooling Setpoint
int16
5 .. 22ºC
3 Operation Mode
int16
0: Auto,
1:Heating,
2:Cooling
4 Space Heating/Cooling
On/O󰀨
int16
0:OFF 1:ON
Register
O󰀨set
Name Type Range
6 Room Thermostat
Control Heating
Setpoint
int16
12 .. 30ºC
7 Room Thermostat
Control Cooling
Setpoint
int16
15 .. 35ºC
9 Quiet Mode Operation
int16
0:OFF 1:ON
10 DHW Reheat Setpoint
int16
30 .. 60ºC
12 DHW Reheat On/O󰀨
int16
0:OFF 1:ON
13 DHW Booster Mode
On/O󰀨
int16
0:OFF 1:ON
53 Weather Dependent
Mode
int16
0:Fixed
1: Weather
Dependent
2: Fixed
+Scheduled
3: Weather
Dependent
+Scheduled
54 Weather Dependent
Mode LWT Heating
Setpoint O󰀨set
int16
-10 .. 10ºC
55 Weather Dependent
Mode LWT Cooling
Setpoint O󰀨set
int16
-10 .. 10ºC
INFORMATION
The available range for setpoint registers is
determined by the Minimum and Maximum Setpoint
of the function dened in the Altherma system eld
settings. Consult the Altherma operation manual for
the setpoint ranges of the selected product.
INFORMATION
If a write to a setpoint register is outside of the
congured range of the register then the setpoint
will be set to the nearest valid minimum or maximum
value.
For all other registers, if a value outside of the register
range is written, then the register value is not updated..

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