INDEX
1. Presentation .......................................................................................................... 4
2. Connection ............................................................................................................ 5
2.1 Connect to the AC indoor unit ............................................................................... 5
2.2 Connection to the EIA-485 bus ............................................................................. 6
3. Quick Start Guide ................................................................................................... 6
4. Modbus Interface Specification ................................................................................ 7
4.1 Modbus physical layer.......................................................................................... 7
4.2 Modbus Registers ................................................................................................ 7
4.2.1 Control and status registers ........................................................................... 7
4.2.2 Configuration Registers.................................................................................. 9
4.2.3 Considerations on Temperature Registers ........................................................ 9
4.3 DIP-switch Configuration Interface ...................................................................... 11
4.4 Implemented Functions ..................................................................................... 15
4.5 Device LED indicator ......................................................................................... 15
4.6 EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ...................... 16
5. Electrical and Mechanical features .......................................................................... 17
6. List of supported AC Unit Types. ............................................................................ 18
7. Error Codes ......................................................................................................... 19
8. Annex 1: Master/Slave of Operation Mode ............................................................... 23
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