FDP3-MODBUS Interface

Use cases

• Monitor current setpoint, minimum setpoint, and maximum setpoint of Toshiba VRF units on a live cloud dashboard.
• Control on/off state and operating mode of Toshiba SMMS or SHRM systems remotely from the ModbusCloud platform.
• Create an alert when a room setpoint deviates from the desired range for more than a configurable time period.
• Adjust temperature setpoints for multiple Toshiba split units across a building from a single dashboard view.
• Generate historical reports on HVAC operating modes and setpoint changes for energy auditing purposes.
• Verify that air conditioning units are switched off outside business hours to reduce energy consumption.

Installation

1. 1Connect the FDP3-MODBUS interface to the TCC-NET A,B terminals on the Toshiba indoor unit or VRF controller, following the wiring diagram in the FDP3 manual.
2. 2Wire the RS-485 A and B lines from the FDP3-MODBUS to the Modbus RTU port on the ModbusCloud gateway (MCG or MLP series), ensuring correct polarity and termination.
3. 3Set the Modbus slave address on the FDP3-MODBUS using the DIP switches or configuration method described in the FDP3 documentation, and confirm the baud rate is 9600.
4. 4Log in to the ModbusCloud platform, add the gateway, and import the Toshiba FDP3-MODBUS template from the template library.
5. 5Assign the template to the correct Modbus slave address and verify that setpoint readings appear on the dashboard.
6. 6Test on/off control and setpoint writes from the dashboard to confirm bidirectional communication is working.

Things to watch for

01

What baud rate should I use for the FDP3-MODBUS interface?

The default baud rate is 9600. Make sure the ModbusCloud gateway serial port is also configured to 9600 baud, 8 data bits, no parity, 1 stop bit (8N1) unless the FDP3 documentation specifies otherwise.

02

Do I need an additional adapter card on the Toshiba indoor unit?

No. The FDP3-MODBUS connects directly to the TCC-NET A,B remote controller network. No other network adapter cards are required, even for split air conditioning units.

03

Can the FDP3-MODBUS coexist with a wired wall controller on the same indoor unit?

Yes. The FDP3-MODBUS sits on the TCC-NET bus alongside standard Toshiba wired remote controllers. Both can operate at the same time, though the last command received by the unit will take priority.

04

I can read setpoint values but writes are not working. What should I check?

Confirm that the Modbus slave address matches on the FDP3-MODBUS and in the ModbusCloud template. Also check that the gateway is sending the correct function code for write operations and that no other master device is conflicting on the RS-485 bus.

Registers (5)

3 read / 3 write

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