Daikin EKMBPP1, Installation Manual

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6 Configuration
Installation manual
20
EKMBPP1
Modbus adapter
4P720139-1B – 2023.09
6.2 P1P2 communication
The EKMBPP1 enters P1P2 search mode in three cases:
1 When the adapter is powered on, it enters the P1P2 search mode.
The adapter cycles between Sub mode and Main mode.
2 If the adapter is in Main mode, it enters the P1P2 search mode when
a communication error occurs with all connected indoor units.
3 If the adapter is in Sub mode, it enters the P1P2 search mode when
a communication error occurs with the main R/C.
When the power is first turned on, the adapter operates in Sub mode.
The adapter waits for an initial request from the main remote controller.
The adapter then switches to Main mode if no initial command is
received for 90 seconds after power ON. In Main mode, the adapter
performs auto addressing and attempts to assign addresses to indoor
units. If there is no response, the adapter will try to auto address again.
If there is still no response, the adapter will switch back to Sub mode.
Upon switching back to Sub mode, the adapter listens for a command
for 15 seconds before switching to Main mode again.
6.3 Modbus protocol
Parameter Value
Network 3 wire RS485
Mode Modbus RTU Slave
Baud rate 9600
Parity None
Stop bits 1
Register Base 0
6.3.1 Modbus address range
Set the Modbus address range (0~63) with the DIP switch. See "3.1
Components" [
4
7] for the location of the LEDs on the PCB.
See "10.1 Modbus addresses" [
4
36] for an overview of all Modbus
address DIP switch combinations.