Specifications

4P357732-1 – 2014.04 Page 1 of 58
Design guide Modbus Interface DIII
EKMBDXA7V1
Table of Contents
Safety Precautions ...................................................................................................................................... 3
1. Introduction ............................................................................................................................................. 3
1.1 System layout .................................................................................................................................... 3
1.2 Limitations ......................................................................................................................................... 4
1.3 Specifications .................................................................................................................................... 4
1.3.1 Dimensions and field wiring ....................................................................................................... 5
1.3.2 Wiring diagram ........................................................................................................................... 6
1.3.3 LED meaning .............................................................................................................................. 6
1.3.4 Termination resistance ............................................................................................................... 6
1.3.5 Push buttons .............................................................................................................................. 6
1.3.6 Dipswitch meaning ..................................................................................................................... 7
1.4 Overview of compatible Daikin units ranges with DIII connection ................................................... 8
1.4.1 Overview of compatible Daikin models with DIII connection (detail) ......................................10
1.5 Overview of compatibilty with other DIII centralised control equipment ........................................14
2. Modbus communication .......................................................................................................................15
2.1 Modbus Interface DIII settings ........................................................................................................15
2.2 Communication format ...................................................................................................................16
2.2.1 Function format ........................................................................................................................16
2.2.2 Character format ......................................................................................................................19
2.2.3 Silent internal time ....................................................................................................................19
2.2.5 Response time .........................................................................................................................19
2.3 Communication procedure .............................................................................................................20
2.3.1 System initialisation ..................................................................................................................20
2.3.2 Monitor and operate units from the BMS.................................................................................21
2.3.3 Other DIII devices exist in the same system ............................................................................25
3. Modbus registers ..................................................................................................................................26
3.1. Input registers ................................................................................................................................26
3.2 Holding registers .............................................................................................................................37
4. Software of Modbus Interface DIII ........................................................................................................45
4.1 Software releases ............................................................................................................................45
4.2 Software update with Updater ........................................................................................................45
4.2.1 Updater .....................................................................................................................................45
4.2.2 Method 1) Update with the PC USB cable EKPCCAB3. .........................................................47
4.2.3 Method 2) Update with a USB/RS485 converter. ....................................................................49