Specifications

Chapter7CommunicationProtocolVFD‐G7SeriesFrequencyInverterOperationManual

156
Chapter 7 Communication Protocol
VFD‐G7 series VFD communicatewith PC,PLCetcuppermachines, andtheyneed the
support of standard expansion cards SC‐EXT1‐IO. And the cards supply RS485
communication interface. Between the upper user machine and frequency inverter
communicatethrough the international standardModBus communication, and the upper
user machine as
 host machine, and the frequency inverter as slave machine. The
communication content could be finished as follows: send operating command to
frequency inverter, setting operating frequency, changing function code parameters,
reading frequencyinverter operation situation, monitoring parameters, fault information,
functioncodeetc.
7.1 Communication Allocation
SetbaudrateandparitybitthroughF8.01.
7.2 Protocol Form
Figure7‐1MODBUSprotocolform
7.3 Protocol Form Instruction
7.3.1 Data type
Allthedataispresentedby16system.
7.3.2 Salve machine address
TheaddressoffrequencyinvertershouldbesetthroughF8.00,0isbroadcastaddress,slave
addresscouldbesetto1~247.
7.3.3 Read function code
Functioncode03:presentreadingthevariantthefunctioncode.
Realized function：readingfrequency inverteroperation situation, monitoring parameters,