Wiring specifications
The wiring should be 2-core Sheathed Vinyl Cord or Cable. Wiring Size: 0.75 ~ 1.25 mm2. The maximum length is 500 m (for exact information please contact Daikin Technical Support ot see the specs in Daikin manuals, e.g. BRC Installation Manuals).
Where on the P1P2 network are the interfaces connected?
The RTD interface is placed on the wired remote controller's P1P2 bus network. The connection nodes can be 'anywhere', i.e. a device can be placed anywhere on the bus. So, for example the RTD-NET doesn't need to be wired directly to the indoor unit, but can be wired to the wired remote controller only, which in turn would then be wired to the indoor unit's P1P2 terminals.
How many RTD interfaces on the same P1P2 network?
The RTD interfacs acts as a remote controller and therefore is placed on the P1P2 bus (only the RTD-RA and variants do not support the P1P2 network).
Only 1 RTD interface can be placed on the same P1P2 network.
How many indoor units on the same P1 P2 network
While some RTD interfaces and indoor units support up to 16 indoor units on the same P1P2 network (e.g. RTD-NET, RTD-10), others may only support 1 unit on the same P1P2 network. Please refer to Daikin Technical Support for further details specific to your used product.
Note that when several indoor units are grouped on the same P1P2 network each of these is assigned a P1P2 address. For information about setting an indoor unit's address please contact Daikin Technical Support or consult the indoor unit's and remote controller's installation or service manuals.
How many remote controllers on the same P1P2 network?
Daikin's P1P2 network only allows for 2 remote controllers (RTD acts as 1 remote controller) to be used simultaneously (please see the Daikin indoor unit's Installation Manual or contact Daikin technical Support for further information).
While some RTD interfaces do not require a wired remote controller to be connected for correct operation (e.g. RTD-NET), other RTD interfaces may not operate if a wired remote controller is connected (e.g. RTD-MB/NET). Please refer to the installation instructions of the respective RTD interface and, if applicable, required operation mode of the RTD interface for the specific requirements.
MAIN or SUB P1P2 controller
In the case of 2 remote controllers (2 remote controllers = 1 wired remote controller + 1 RTD) one of the two remote controllers has to be configured as MAIN P1P2 device (master remote controller) and one as SUB P1P2 device (slave).
While some RTD interfaces can operate as both MAIN or SUB P1P2 device (e.g. RTD-NET), other RTD interfaces may require the wired remote controller to be set as either MAIN or SUB P1P2 device. Furthermore, some readback data may only be available for specific P1P2 modes of the RTD interface. Please refer to the installation instructions of the respective RTD interface and, if applicable, required operation mode of the interface for the specific requirements.
Please follow this link for information on how to configure a device to MAIN or SUB P1P2 mode.
Checking the P1P2 communication
LEDs (please see the respective RTD installation instructions for further details):
- LED 1 solid, LED 2 Off, LED 3 flashing: P1P2 communication is established and data is communicated
- LED 1 Off, LED 2 solid, LED 3 flashing: P1P2 communication is established, unit fault is reported and data is communicated
- LED 1 flashing, LED 2 solid, LED 3 Off: P1P2 communication is not established (AC unit missing)
You can check the P1P2 communication with Modbus by reading the Fault Code register, as well as other parameter registers. For testing you can use our software ModTool (click here for further information).
Note: The data communicated across the P1P2 network cannot be read.
Reading the P1P2 communication
We do not offer any tool to read communication data on Daikin's P1P2 network.