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CDE360 Vector Control AC Drive
The AC drive provides RS485 communication interface, for the master-slave communication with
international standard MODBUS-RTU protocol. The user can through the PC/PLC PC to read and
modify the function code, set the control command and the reference frequency converter, working
status monitoring and fault information, to realize the centralized control.
8.1 Protocol Comment
The MODBUS protocol of the AC drive defines the transmission frame content and format to be
used, including: host polling and broadcast frames, slave response frame format; the host frame
includes: the slave address (or broadcast address), the command code, data and CRC check. Slave
response frame is the same. If the error occurs in the received frame from the host, or can't
complete the host required action, the slave machine will organize a fault frame as a response to
feedback to the host.
8.2 Networking Mode
There are two kinds of configuration mode of the AC drive: single host / multi slave mode and single
host / single slave mode.
8.3 Bus Structure
1. Interface mode
RS485 interface, asynchronous, half duplex.
Default data formats: 8-N-1 (8 data bits, no parity, 1 stop bit), 9600bps.
2. Communication mode
From the set range is 1 ~ 247. 0, for broadcast communication.
Each network have unique slave address, this is the foundation and guarantee of MODBUS
communication.
The frequency converter act as slave, point to point communication master-slave, host using the
broadcast address to send frames, no response from the slave.
From the slave's keypad or the means of communication, can be provided to change the
address, baud rate and data format.
Chapter 8 Communication Protocol
Chapter 8 Communication Protocol
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