CT100 inverter Communication protocol
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9 Communication protocol
The CT100 series inverters provide RS485 communication interface. You can
realize centralized control via PC/PLC (set the run commands and function
parameters of the inverter, read the work state and fault information of the
inverter) to meet the specific requirements.
1. Content
The serial communication protocol defines the content and format of the
transmission information for serial communication, including master polling (or
broadcast) format, master encoding method including the required function
codes, transmission data and error check. The slave response also uses the
same structure including actuation confirmation, return data and error check. If
an error occurs when the slave receives information or the slave cannot
complete the actuation required by the master, it will feedback a response of fault
information to the master.
2. Application mode
The inverter has access to "single- master multi-slaves" PC/PLC control network
with RS485 bus.
Support Modbus protocol and RTU format; broadcast address is 0 and slave
address can be set to 1~247.
3. Bus structure
(1) interface mode
RS485 (CT100 terminals: 485 + and 485-) hardware interface
(2) transmission mode
Asynchronous serial, half duplex transmission. At the same time, only one can
send data and the other can receive data for the master and the slave. Data in
the serial asynchronous communication process, in the form of a message, can
be sent one by one frame.
(3) topology structure
Single-master multi-slaves network, the slave address in the network must be
unique.
4. Description of the protocol
CT100 series inverter communication protocol is an asynchronous serial
master-slave Modbus communication protocol and only one device (master) in
the network can establish a protocol (called "query/command"). Other devices
(slaves) can only provide data to respond to the master's "query/command" or
make the corresponding actuation according to the master's "query/command".
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