VM1000 Series
‐112‐
Chapter 6 VM1000 Communication Application
VM1000 series provides RS485 communication interface and supports MODBUS
communication protocol. Through computer or PLC, users can achieve centralized
control, set VFD operation command, modify or read function code parameters, read
the working status and fault information etc.
6.1 The Content of Protocol
The serial communication protocol defines the information content and use format
of transmitting the serial communication, which includes: host “polling” (or
broadcasting) format; The encoding method of host includes: function code of
requiring action, data transmission, and error checking etc.If error occurred in the
slave drive while receiving the information or can not complete the requested action
form the host, it will organize a fault message as a response to the host.
6.2 Application
VFD is connectted to the "Single-host and multi-slave" PC / PLC control network
with RS485.
6.3 Bus Structure
(1) Interface: RS485 hardware interface
(2) Transmission mode: asynchronous serial, half-duplex transmission mode. At the
same moment, there is only one can transmit data while the other receive data in
master and slave. During the asynchronous serial communication, data is sent frame
by frame based on the packets.
(3) Topology: In single-host and multi-slave system, slave address range from 1 to
31, 0 is broadcast communication address. Network slave address must be unique.
To Next Page
Loading...
Need help?
General
