HNC Electric HV590 Series, User Manual

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Appendix I H5RS485 Card & RS485Communication Protocol
I.1 H5RS485 card
H5RS485 card produced by HNC is used with HV590 series inverter as RS485
communication card. It contains the following resources
：
Table 2Jumper description
Jumper number Description
J1
SP1 connection mode selection
J2
RS485 Termination resistor selection
I.2 Communication protocol
I.2.1 Protocol content
The serial communication protocol defines the information content and format of the
use of the transmission in serial communication. Including
：
the host polling (or broadcast)
format
、
host encoding methods.Concent including
：
require action of the function code,
data transmission and error checking and so on. Slave machine's response is the same
structure, including
：
action confirmation, return data and error checking. Slave error
occurred when receiving information, or can not do what the host request action, it will
organize a fault messageas the response back to the host computer.
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 rece ive 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.
I.3 Protocol Description
HV590 series inverter communication protocol is an asynchronous serial master -slave
Modbus communication protocol, only one device in the network (master) to establish
protocol (known as the "query / command"). Other device (slave) can only provide data
response to the host query / command, or make the appropriate action according to the