Fuji Electric FRENIC-VG Series - Chapter 5 USING STANDARD

Chapter 5
USING STANDARD RS-485
This chapter describes the use of standard RS-485 communications ports and provides an overview of
FRENIC-VG Loader.
Contents
5.1 Standard RS-485 Communications Ports ............................................................................................5-1
5.1.1 RS-485 common specifications................................................................................................... 5-2
5.1.2 Terminal specifications for RS-485 communications.................................................................. 5-3
5.1.3 Connection method ..................................................................................................................... 5-4
5.1.4 Communications support devices................................................................................................ 5-6
5.1.4.1 Converters .................................................................................................................................. 5-6
5.1.4.2 Cables......................................................................................................................................... 5-7
5.1.5 Link functions ............................................................................................................................. 5-7
5.1.5.1 Link command permission selection.......................................................................................... 5-7
5.1.5.2 Link edit permission selection.................................................................................................... 5-8
5.1.5.3 S range option priority ............................................................................................................... 5-8
5.1.6 Referencing and changing data ...................................................................................................5-9
5.1.6.1 Write restrictions for function codes .......................................................................................... 5-9
5.1.6.2 Negative response and error response...................................................................................... 5-10
5.1.6.3 No response.............................................................................................................................. 5-10
5.1.7 RS-485 function codes .............................................................................................................. 5-11
5.1.7.1 Response interval time (H39)................................................................................................... 5-11
5.1.7.2 Disconnection detection time (H38)......................................................................................... 5-12
5.1.7.3 Character timeouts ................................................................................................................... 5-12
5.1.7.4 Timeouts on the master side.....................................................................................................5-12
5.1.8 Host side procedures ................................................................................................................. 5-13
5.1.8.1 Read procedure ........................................................................................................................ 5-13
5.1.8.2 Write procedure........................................................................................................................ 5-14
5.1.9 RAS........................................................................................................................................... 5-15
5.1.9.1 Communication errors.............................................................................................................. 5-15
5.1.10 Communication error measures................................................................................................. 5-18
5.2 Fuji General-purpose Communications.............................................................................................5-19
5.2.1 Message format ......................................................................................................................... 5-19
5.2.2 Transmission frame ................................................................................................................... 5-19
5.2.3 Standard frame .......................................................................................................................... 5-20
5.2.4 Option frame ............................................................................................................................. 5-23
5.2.5 Negative response frame ........................................................................................................... 5-27
5.2.6 Field descriptions ...................................................................................................................... 5-28
FRENIC- VG
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