7
Contents
Preface ........................................................................................................................................................................... iii
Safety warnings...........................................................................................................................................................iii
Disclaimer....................................................................................................................................................................iv
Amendment Register ..................................................................................................................................................... v
Firmware revision history............................................................................................................................................. vi
1.Safety precautions................................................................................................................................................ 8
2.Overview................................................................................................................................................................ 9
3.DIP switch settings............................................................................................................................................. 10
3.1.RS-485 Node address.................................................................................................................................. 10
3.2.RS-485 communication settings................................................................................................................... 10
3.3.Protocol selection ......................................................................................................................................... 11
3.4.Deadband mode........................................................................................................................................... 11
4.Deadband Mode.................................................................................................................................................. 12
4.1.Settings ........................................................................................................................................................ 12
4.2.Operation ..................................................................................................................................................... 12
4.3.Initialisation .................................................................................................................................................. 13
5.Setpoint Offset.................................................................................................................................................... 14
5.1.Settings ........................................................................................................................................................ 14
5.2.Operation ..................................................................................................................................................... 14
6.RS-485 termination ............................................................................................................................................. 16
7.Installation........................................................................................................................................................... 17
7.1.Physical connection...................................................................................................................................... 17
7.2.Power supply................................................................................................................................................ 17
7.3.Modbus connections .................................................................................................................................... 17
7.4.Unit type selection ........................................................................................................................................ 17
7.5.Using Twin/Triple/Quad systems.................................................................................................................. 18
7.5.1.When fault Modbus register is being used ............................................................................................ 18
7.5.2.When fault Modbus register is not being used ...................................................................................... 18
7.6.Using single split units in a group ................................................................................................................. 19
7.6.1.When fault Modbus register is being used ............................................................................................ 19
7.6.2.When fault Modbus register is not being used ...................................................................................... 19
7.7.Using MXZ split units.................................................................................................................................... 20
8.Status LEDs ........................................................................................................................................................ 21
8.1.AC ACK........................................................................................................................................................ 21
8.2.RS-485 ACK................................................................................................................................................. 21
9.BACnet ................................................................................................................................................................ 22
9.1.BACnet MS/TP ............................................................................................................................................. 22
9.2.BTL Listing ................................................................................................................................................... 22
9.3.Object types supported ................................................................................................................................ 23
9.4.Object list ..................................................................................................................................................... 24
10.Modbus connection............................................................................................................................................ 25
10.1.Modbus background..................................................................................................................................... 25
10.2.Modbus registers.......................................................................................................................................... 25
10.3.Modbus connections .................................................................................................................................... 25
11.Modbus tables – Air-To-Air systems................................................................................................................. 27
11.1.Holding registers .......................................................................................................................................... 27
11.2.Input registers............................................................................................................................................... 29
11.3.Discrete Inputs ............................................................................................................................................. 30
11.4.Coils ............................................................................................................................................................. 30
12.Modbus tables – Air-To-Water systems............................................................................................................ 31
12.1.Holding registers .......................................................................................................................................... 31
12.2.Input registers............................................................................................................................................... 55
12.3.Coils ............................................................................................................................................................. 69
12.4.Discrete Inputs ............................................................................................................................................. 70
13.Modbus tables – Lossnay systems................................................................................................................... 75
13.1.Holding registers .......................................................................................................................................... 75
13.1.Input registers............................................................................................................................................... 82
13.1.Coils ............................................................................................................................................................. 85
13.1.Discrete Inputs ............................................................................................................................................. 85
Appendix A – Compatible Air-To-Air units................................................................................................................. 88
Appendix B – Compatible Air-To-Water units............................................................................................................ 90
Appendix C – Compatible Lossnay units................................................................................................................... 91
