Mounting
The FDP3 interface can be mounted on DIN rails, or on a surface using screws of up to 5mm diameter.
Please contact Toshiba Technical Support for further details on mounting a FDP3 interface inside a Toshiba indoor unit, as they as can advise you better on their products.
TCC-net AB network
TCC-NET Terminals A, B on the FDP3 interface connect to the Toshiba TCC-NET remote controller network. The polarity of the AB network is not critical (this means it would work either way around).
*Note that the FDP3 is powered from this connection and communicates with the indoor unit on this network. Therefore, if the indoor unit looses power the FDP3 interface will loose power too.
Up to 8 indoor units can be wired to one FDP3-Modbus (this is called 'group control'). In the case of group control all indoor units in the group receive the same command from the FDP3 interface, but can be monitored individually (for further information read FDP3: How to read data of a unit which is in a group).
Therefore, for individual control install one FDP3 interface for each indoor unit.
Please note that the TCC-NET network is NOT the same as the A-B-C network. If your indoor unit only supports the A-B-C network then contact Toshiba Technical services for information about TCC-link AB connections and A-B-C connections/terminals.
Note: If the application requires more than 8 units in a control group then following option can be considered:
- Use more than one FDP3-Modbus interface and connect 8 indoor units to the first one and the rest of the indoor units to the other FDP3-Modbus interfaces. Via Modbus read all the required parameters from the first FDP3-Modbus interface and write them (via Modbus) to the other FDP3-Modbus interfaces.
Wired remote controller
The FDP3 interface acts as a remote controller and can be connected together with one Toshiba remote controller.
The FDP3 interface can operate without an additional wired remote controller (therefore it is optional).
RS485 network for Modbus communication
The FDP3 interfaces use the RS485 network for Modbus communication. Please read the article RS485 network requirements for further information.
Note that a maximum of 62 FDP3 devices can be placed on a single physical network.
- Each FDP3 has half a standard RS485 network load. An RS485 network can have a maximum of 32 standard network loads. 62 interfaces are allowed based on the assumpotion that the Modbus master is a standard network load.
DIP switches
No specific DIP switch settings are required. However, DIP switches can be used to enable specific functionalities (timeout).
The DIP switches are mainly used to set the Modbus network address.
Modbus
With Modbus indoor units' parameters can be controlled and monitored. For details on available Modbus registers, please click here.
The FDP3-Modbus supports the Standard RTU Modbus protocol. Please see the FDP3-Modbus installation instructions for default Modbus communication parameters, as well as Modbus commands. If Baud rate and parity need to be changed then please follow this link for FDP3 baud rate and parity settings.
The FDP3-Modbus only operate as Modbus slave.
The Modbus registers base is '0'. However, do note that some BMS systems shift the register addresses by '1'.
Note that we offer a software only for testing ModTool communication (see below).
Status LEDs
The FDP3 LEDs signal various statuses during start-up, as well as during operation. For explanation of the LED (LED 1 and LED 2) signals please see the Installation instructions.
Once communication over TCC-Net between FDP3 and indoor unit(s) has been established LED 3 should be flashing indicating that information is being exchanged between the FDP3 interface and the indoor unit(s).
Faults
- LED 1 is Off and LED 2 remains solid (On).
Faults and Fault codes can be monitored via Modus. For further information, please read Fault Detection with FDP3-Modbus.
Testing
For testing purposes with Modbus our free software ModTool can be used (please click here for further information).
It is possible to power an FDP3 from a power supply to the TCC-Net AB terminals. Power supply requirements are 15V-24V DC, 50mA, polarity doesn't matter. However, do note that in this case the Modbus register values are '0', because no indoor units is connected.