Affiliations: College of Physics and Information Engineering, Fuzhou University, Fuzhou, Fujian, China
Correspondence:
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Corresponding author: XuFei Sun, College of Physics and Information Engineering, Fuzhou University, Fuzhou, Fujian, China. E-mail:[email protected]
Abstract: This paper describes a fieldbus of which the physical
layer using CAN (Controller Area Network) transmission line and the data
link layer using SPI (Serial Peripheral Interface) interface protocol. It
applies to the two-way information exchange between the controller (master)
and the sensor/actuator (slave), to build the underlying network monitoring
system. The bus takes the advantage of the electrical characteristics of CAN
transmission line, and the bus inherits its anti-interference ability and
the advantage of long transmission distance. Also, it inherits the merits of
SPI bus communication such as fast, easy to use and low cost. Compared with
the half duplex distributed network constructed by EIA-485, the slave in
this bus is a pure hardware device, saving the MCU chip and software
programming. This paper presents a new bus communication protocols and
hardware structure of slave interface module and describes the working
principle of the interface circuit. Finally, experimental data and test
results are given, verifying the feasibility and communication features of
this type of bus and the interface module design.
Keywords: Fieldbus, SPI interface, CAN transmission line, communication protocol
