HV580L Series Frequency Inverter
190
Application mode:
The inverter accessing with ―single main multi-slave‖ PC/PLC control network, which equipped with
RS232/RS485 bus.
Bus structure:
(1)Interface mode
RS232/RS485 hardware interface
(2)Transmission mode
Asynchronous serial, half-duplex transmission. At the same time host and slave computer can only permit one
to send data while the other can only receive data. Data in the process of serial asynchronous communication
is in the message format and sent one frame by one frame.
(3)Topological mode
In single-master system, the setup range of slave address is 1 to 247. Zero refers to broadcast communication
address. The address of slave must is exclusive in the network. That is one condition of one slave machine.
Communication information structure
HV580L Modbus protocol communication data format is as below:
Including: starting bit, 8 data bits, parity bit and stop bit.
Starting
bit
Bit1
Bit2
Bit3
Bit4
Bit5
Bit6
Bit7
Bit8
Parity
bit
Stop
bit
The entire message frame must be used as a continuous stream. If the pause time frame prior to the
completion of more than 1.5 byte times, the receiving device will refresh the incomplete message and
assumes that the next byte will be the address field of a new message. Similarly, if a new message starts in
less than 3.5 bytes times following the previous message, the receiving device will consider it a continuation of
the previous message. This will set an error, as the value in the final CRC field will not be valid for the
combined messages. A typical message frame is shown below.
RTU frame format
:
START
3.5-character time
Slave address ADDR
Communication address: 1~247