Implemented Modbus Functions - HMS Networks Intesis INMBSDAI001I000 User Manual

INMBSDAI001I000 Modbus RTU Gateway
When the gateway detects a change of any of the values of {S
(S ) to the indoor unit.
AC
After a device boot, the value for the external temperature reference (register 22/23) is -32768 (0x8000).
This value means that no external temperature reference has yet been provided to the object, so the system
is not applying the virtual temperature function.
NOTE
The use of the external temperature reference (register 22/23) (e.g., writing a value different
than -32768 / 0x8000 in it) has the following relevant consequences:
• The virtual temperature mechanism is applied. The temperature setpoint value shown by the
remote controller or any other control system connected to the indoor unit may differ from
the value shown in register 4/5.
• The user is not allowed to change the setpoint using the unit's remote controller, as
the setpoint of the indoor unit becomes exclusively controlled by the virtual temperature
mechanism.
• AC real temperature setpoint (R) (protocol address register 23 / PLC address register 24)
As mentioned above, the actual temperature setpoint in the indoor unit and the temperature setpoint
requested from the gateway might differ when a value in the external temperature reference (register 22/23)
is entered. This register always holds the current temperature setpoint that is being used by the indoor unit;
this value is the actual temperature setpoint that will be shown in any present remote controller.
NOTICE
Temperature values for these registers are expressed in the temperature scale and magnitude set
via the corresponding DIP switch block.
These are the available options:
• Celsius value: The value in the Modbus register is stored in degree Celsius (i.e. a "22" value in
the Modbus register must be interpreted as 22°C). This is the default value.
• Tenths of value: The value in the Modbus register is stored in decidegree Celsius (i.e. a "220"
value in the Modbus register must be interpreted as 22.0°C).
• Fahrenheit value: The value in the Modbus register is stored in degree Fahrenheit (i.e. a "72"
value in the Modbus register must be interpreted as 72°F (~22°C).
See DIP Switch Configuration (page 10)

5.3. Implemented Modbus Functions

The INMBSDAI001I000 gateway implements the following standard Modbus functions:
• 03: Read Holding Registers
• 04: Read Input Registers
• 06: Write Single Register
• 16: Write Multiple Registers
IMPORTANT
Even though function 16 is available, the gateway does not allow writing operations on more than
one register with the same request, so the length field when using this function should always be
one.
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for more information.
Implemented Modbus Functions
}, it will send the new setpoint
AC
USER MANUAL Version 1.0.0