Instructions

Intesis
®
Modbus RTU – Fujitsu User Manual r1.3 EN
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INDEX
1 Presentation .......................................................................................................................................................... 5
2 Connection ............................................................................................................................................................ 6
Connect to the AC indoor unit ....................................................................................................................... 6
Connection to the EIA-485 bus ..................................................................................................................... 6
3 Quick Start Guide .................................................................................................................................................. 7
4 Modbus Interface Specification ............................................................................................................................. 8
Modbus physical layer ................................................................................................................................... 8
Modbus Registers ......................................................................................................................................... 8
4.2.1 Control and status registers ................................................................................................................... 8
4.2.2 Configuration Registers ....................................................................................................................... 10
4.2.3 Considerations on Temperature Registers .......................................................................................... 10
DIP-switch Configuration Interface .............................................................................................................. 12
Implemented Functions ............................................................................................................................... 14
Device LED indicator ................................................................................................................................... 14
EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ...................................................... 15
5 Mechanical & electrical characteristics ............................................................................................................... 16
6 AC Unit Types compatibility ................................................................................................................................ 17
7 Error codes .......................................................................................................................................................... 18
Intesis Codes ............................................................................................................................................... 18
RAC and VRF J-II / V-II / VR-II series ......................................................................................................... 18
VRF V / S / J Series .................................................................................................................................... 21