Table Of Contents - Fuji Electric FRENIC-AQUA series User Manual

CHAPTER 1 OVERVIEW
1.1 Features ................................................................................................................................... 1-1
1.2 List of Functions ....................................................................................................................... 1-3
CHAPTER 2 COMMON SPECIFICATIONS
2.1 Specifications of RS-485 Communications .............................................................................. 2-1
2.1.1 RJ-45 connector (modular jack) specifications ................................................................ 2-3
2.1.2 Terminal block specifications ........................................................................................... 2-4
2.1.3 Connection cable specifications....................................................................................... 2-5
2.2 Connections ............................................................................................................................. 2-6
2.2.1 Basic connection .............................................................................................................. 2-6
2.2.2 Connection notes ........................................................................................................... 2-10
2.2.3 Connection devices........................................................................................................ 2-13
2.2.4 Measures against noise ................................................................................................. 2-14
2.3 Switching to Communications ................................................................................................ 2-16
2.3.1 Functions for the switching ............................................................................................ 2-16
2.3.2 Link functions (Mode selection) ..................................................................................... 2-17
2.3.3 How to switch communications enabled/disabled ......................................................... 2-18
2.3.4 Loader link functions (Mode selection) .......................................................................... 2-19
2.4 Making RS-485-related Settings ............................................................................................ 2-20
2.4.1 Link function (RS-485 setting)........................................................................................ 2-20
2.5 Selecting Data Clear Processing for Communications Error ................................................. 2-23
CHAPTER 3 Modbus RTU PROTOCOL
3.1 Messages ................................................................................................................................. 3-1
3.1.1 Message formats.............................................................................................................. 3-1
3.1.2 Message types ................................................................................................................. 3-1
3.1.3 Message frames .............................................................................................................. 3-2
3.1.4 Message categories......................................................................................................... 3-4
3.1.5 Communications examples............................................................................................ 3-12
3.2 Host Side Procedures ............................................................................................................ 3-13
3.2.1 Inverter's response time................................................................................................. 3-13
3.2.2 Timeout processing........................................................................................................ 3-14
3.2.3 Receiving preparation complete time and message timing from the host ..................... 3-15
3.2.4 Frame synchronization method...................................................................................... 3-15
3.3 Communications Errors.......................................................................................................... 3-16
3.3.1 Categories of communications errors ............................................................................ 3-16
3.3.2 Operations in case of errors........................................................................................... 3-17
3.4 CRC-16 .................................................................................................................................. 3-20
3.4.1 Overview of the CRC-16 ................................................................................................ 3-20
3.4.2 Algorithm ........................................................................................................................ 3-20
3.4.3 Calculation example....................................................................................................... 3-22
3.4.4 Frame length calculation................................................................................................ 3-23

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