Haier Air Condition YCJ-A002

Installation

1. 1Connect the ModbusCloud gateway (MCG or MLP series) to the YCJ-A002 via a shielded RS-485 cable, observing correct A/B polarity.
2. 2Set DIP switch BM1 on the YCJ-A002 to positions 0 and 1 to enable Modbus RTU communication.
3. 3Set DIP switch SW1 on the YCJ-A002 according to the address table on page 5 of the specification document to assign the correct Modbus slave address.
4. 4Configure the ModbusCloud gateway serial port to 9600 baud, 8 data bits, 1 stop bit, no parity (9600 8N1).
5. 5Import the Haier YCJ-A002 template in the ModbusCloud platform and assign it to the correct gateway and slave address.
6. 6Verify communication by checking that indoor temperature readings appear on the ModbusCloud dashboard.

Things to watch for

01

Why does the YCJ-A002 make a buzzer sound when I poll it?

This is normal behavior. The YCJ-A002 emits a short buzzer tone each time it receives Modbus data. It does not indicate an error.

02

What baud rate and serial settings should I use?

Use 9600 baud, 8 data bits, 1 stop bit, no parity (9600 8N1). These are the default settings for the YCJ-A002.

03

How do I set the Modbus slave address on the YCJ-A002?

The slave address is configured using DIP switch SW1 on the YCJ-A002. Refer to the address table on page 5 of the specification document for the correct switch positions.

04

Is this template compatible with all Haier AC units?

No. The YCJ-A002 gateway and this template only support cassette, duct, baseboard, and ceiling type indoor units. Check the YCJ-A002 compatibility list before installation.

Registers (4)

1 read / 4 write

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