abc 2000 Series User Manual page 175

Communication Protocol
MT-
2000 series inverter provides RS232
interface, and support the Modbus communication protocol. Users
can be achieved by computing machine or PLC central control,
through the communication protocol set inverter running commands,
modify or read function code parameters, read the inverter working
condition and fault information, etc.
1 ,
The agreement content
The serial communication protocol defines the serial communication
transmission of information content and format.Including: host
polling or wide planting format;Host encoding method, the content
includes: the function of the required action code, data transmission
and error checking, etc.From the ring of machine should be used
is the same structure, content including: action confirmation, return
the data and error checking, etc.If there was an error in receiving
information from a machine, or cannot achieve the requirements of
the host, it will organize a fault feedback information in response to
the host.
2,
Appllcallon methods
Application mode inverter with RS232
"from" single main PC/PLC control nelwor1<.
3, Bus structure
(1)
The interface way RS232
(2) Asynchronous serial transmission mode, half-duplex
transmission mode.At the same time the host and the only one to
send data from the machine and the other can only receive data.
Data in 1he process of serial asynchronous communication, the form
Appendix B
I
RS485 interface hardware
170
· ·
I RS485 communication
I
RS485 bus access to the