Solar Pump Inverter Chapter 7 Communication protocol
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Chapter 7 Communication protocol
The CT112&CT112A 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 (CT112 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.
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