Contents
Preface ............................................................................................................................................................................. i
Safety warnings............................................................................................................................................................ i
Disclaimer..................................................................................................................................................................... i
Amendment Register ..................................................................................................................................................... ii
1. Safety precautions................................................................................................................................................ 4
2. Overview................................................................................................................................................................ 5
3. DIP switch settings............................................................................................................................................... 6
3.1. RS-485 Node address.................................................................................................................................... 6
3.2. RS-485 communication settings..................................................................................................................... 6
3.3. Protocol selection ........................................................................................................................................... 7
3.4.Deadband mode............................................................................................................................................. 7
4. Deadband Mode.................................................................................................................................................... 8
4.1. Settings .......................................................................................................................................................... 8
4.2. Operation........................................................................................................................................................ 8
4.3. Initialisation..................................................................................................................................................... 9
5. Setpoint Offset.................................................................................................................................................... 10
5.1. Settings ........................................................................................................................................................ 10
5.2. Operation...................................................................................................................................................... 10
6. RS-485 termination............................................................................................................................................. 12
7. Installation........................................................................................................................................................... 13
7.1. Physical connection...................................................................................................................................... 13
7.2. Power supply................................................................................................................................................ 13
7.3. Modbus connections .................................................................................................................................... 13
7.4. Unit type selection ........................................................................................................................................ 13
8. Status LEDs ........................................................................................................................................................ 14
8.1. AC ACK........................................................................................................................................................ 14
8.2. RS-485 ACK................................................................................................................................................. 14
9. BACnet ................................................................................................................................................................ 15
9.1. BACnet MS/TP ............................................................................................................................................. 15
9.2. Object types supported ................................................................................................................................ 15
9.3. Object list...................................................................................................................................................... 16
10. Modbus connection............................................................................................................................................ 17
10.1. Modbus background..................................................................................................................................... 17
10.2. Modbus registers.......................................................................................................................................... 17
10.3. Modbus connections .................................................................................................................................... 17
11. Modbus tables – Air-To-Air systems................................................................................................................. 19
11.1. Holding registers .......................................................................................................................................... 19
11.2. Input registers............................................................................................................................................... 21
11.3. Discrete Inputs ............................................................................................................................................. 21
11.4. Coils ............................................................................................................................................................. 21
Modbus tables – Air-To-Water systems ..................................................................................................................... 22
11.5. Holding registers .......................................................................................................................................... 22
11.6. Input registers............................................................................................................................................... 34
11.7. Coils ............................................................................................................................................................. 40
11.8. Discrete Inputs ............................................................................................................................................. 41
Appendix A – Compatible Air-To-Air units................................................................................................................. 44
Appendix B – Compatible Air-To-Water units............................................................................................................ 45
