Mounting
The RTD interface can be mounted on DIN rails, or on a surface using screws of up to 5mm diameter.
The RTD-10 is supplied with 4 mounting pillars that can be used to mount the interface within units with compatible mounting holes.
Please contact Daikin Technical Support for further details on mounting a RTD interface inside a Daikin indoor unit, as they as can advise you better on their products.
Power
The RTD requires a 15V to 24VDC power connection (see the power ratings, as well as WARNINGS and CAUTIONS on page 4 of attached installation instructions). Power can be supplied from VRV indoor unit PCB X18A or X35A connection, a Skyair indoor unit PCB X35A connection or VAM PCB X11A connection (Please contact Daikin Technical Support for further details on powering the RTD from a unit). A 1m cable and connector is supplied with the RTD.
An external DC power supply can be used as power source, too.
P1P2
Please follow this link for information about P1P2 network requirements.
Please note that RTD-10 acts as a remote controller. As such it sends a specific command to the indoor unit. If you require information on how the indoor unit works when a specific command is recieved (e.g. when in Cooling mode and Return Air temperature is below requested setpoint) then please contact Daikin Technical Support.
Wired remote controller
The RTD-10 can operate without an additional wired remote controller (therefore it is optional).
- With respect to compatibility of wired remote controllers to our RTD interfaces, please read this article.
The RTD-10 can operate as both MAIN or SUB P1P2 device. To read some data the RTD-10 needs to be set as MAIN P1P2 device (see attached installation instructions and readback data). When operating the RTD-10 in Duty/Standby mode please set the RTD-10 as MAIN P1P2 device.
Please follow this link for information on how to configure a device to MAIN or SUB P1P2 mode.
Infrared remote controller
When using infrared remote controllers the BRC infra-red receivers must be configured to operate in SUB (S) mode.
RS485
RS485 Cables must use stranded 24awg shielded or unshielded twisted pair to Cat3, Cat4 or Cat5 specification. Use a twisted pair for connections DB,DA and an extra core for connection GND. Install RS485 cable as shown in figure 4 of the RTD-10 installation instructions. For further details see page 5 of the installation instructions (RS485 Network Installation).
DIP switches
The RTD-10 offers several operation modes which can be set using the DIP switches. See the article 'What is the RTD-10 used for?' and the RTD-10 installation instructions for details on DIP switch settings.
Hardwired Inputs (S1 - S6)
Dependent on the operation mode of the RTD-10 various parameters can be controlled using the hardwired inputs (S1 - S6). The use of any of the inputs is optional, i.e. if your application doesn't require the use of hardwired inputs then they can be left open.
- If electric resistors (no specific resistors required) are used for control then the resistance values should be within +/-250 ohms of the quoted value. Open circuit is R>200kΩ.
- If several electrical resistance values are wired simultaneously (in parallel) on an Input (e.g. 2.2kOhm, 3.3kOhm, and 4.7kOhm) then the RTD-10 interface will only see the total electric resistance value on its input (Note: total value of parallel electric resistances: 1/Rtotal = 1/R1 + 1/R2 + 1/R3...)
- If Voltage is used for control then Voltage values should be within +/- 0.25V of the quoted value. Open circuit for V<1V.
- If the input value is too close to the outer range (+/- 250 Ohms or +/- 0.25 V) of a quoted value the RTD-10 may not react. Therefore, please make sure you're well within the range and test.
- Note that controlling is done 'externally' with your BMS system (Modbus and/or hardwired inputs). How ever the external control is implemented it does not affect the RTD-10 operation, as long as the input values are correct.
Please see the RTD-10 installation instructions for information on parameters controlled with hardwired inputs and the required Voltage/Resistance values.
Modbus
The RTD-10 supports the Standard RTU Modbus protocol. Please follow this link for RTD baud rate and parity settings. The RTD-10 uses the same Modbus registers as the RTD-NET (see this article).
*Note: If you wish to use the RTD-10 like a RTD-NET, i.e. only control via Modbus, then operate the RTD-10 in Standard operation mode.
The RTD-10 only operates as Modbus slave, except when operated in Duty/Standby mode. For the case of Duty/Standby operation please see the article RTD-10 Duty/Standby mode: Installation Instructions (point 7).
Relays
The relays are Volt-free contacts (dry contacts) and operate as described in the RTD-10 installation instructions. Please note the allowed power ratings (see this article).
The relays' default status is normally open and they close when there is respective signal. Hence, when the indoor unit is ON relay R1 closes (even when only the Fan is operating).
If necessary, the relays can be reconfigured using the DIP switches as described in this article. Please change ONLY if really necessary.
Status LEDs
The RTD 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 page 8 and respective figures in the Installation instructions.
Once communication over P1P2 between RTD-10 and indoor unit(s) has been established LED 3 should be flashing indicating that information is being exchanged between the RTD and the indoor unit(s).
Fault Signals
A Fault is signalled by relay R2 (unless otherwise configured). The exact fault code can be read either on the wired remote controller display or via Modbus (see the article RTD Fault Codes).
Testing
Testing can be performed via hardwired inputs (S1 - S6), as well as Modbus. It can be tested without connecting an indoor unit. For information on testing via Modbus, please follow this link.
Note that if the RTD is not connected to any indoor unit then the parameters will be reset to default. When connected to an indoor unit then the values you have set will be stored.