Fuji Electric FRENIC-VG Series - Page 20

5.2.6.1 Data field.................................................................................................................................. 5-28
5.2.6.2 Sum-check field ....................................................................................................................... 5-29
5.2.7 Communication examples ......................................................................................................... 5-29
5.2.7.1 Standard frame ......................................................................................................................... 5-29
5.2.7.2 Option frame ............................................................................................................................ 5-30
5.2.7.3 ASCII code table...................................................................................................................... 5-31
5.2.7.4 Program example ..................................................................................................................... 5-32
5.3 Modbus RTU..................................................................................................................................... 5-33
5.3.1 Message format ......................................................................................................................... 5-33
5.3.2 Transmission frame ................................................................................................................... 5-34
5.3.2.1 Reading function codes ............................................................................................................ 5-35
5.3.2.2 Writing single function codes...................................................................................................5-36
5.3.2.3 Writing multiple function codes............................................................................................... 5-37
5.3.2.4 Maintenance code..................................................................................................................... 5-38
5.3.2.5 Error response .......................................................................................................................... 5-39
5.3.3 Error checking........................................................................................................................... 5-40
5.3.3.1 CRC-16 .................................................................................................................................... 5-40
5.3.3.2 CRC-16 algorithm.................................................................................................................... 5-41
5.3.3.3 CRC-16 calculation example ................................................................................................... 5-42
5.3.3.4 Calculating frame length .......................................................................................................... 5-43
5.3.4 Communication examples ......................................................................................................... 5-44
5.3.4.1 Reading .................................................................................................................................... 5-44
5.4 FRENIC-VG Loader ......................................................................................................................... 5-45
5.4.1 Specifications ............................................................................................................................ 5-45
5.4.2 Connection ................................................................................................................................ 5-46
5.4.2.1 USB connection ....................................................................................................................... 5-46
5.4.2.2 RS-485 connection................................................................................................................... 5-47
5.4.2.3 Communication via MICREX-SX ........................................................................................... 5-47
5.4.3 Function overview..................................................................................................................... 5-48
5.4.3.1 Configuring function codes......................................................................................................5-48
5.4.3.2 Trace functions......................................................................................................................... 5-48
5.4.3.3 Operation monitor .................................................................................................................... 5-50