Design of a CAN bus interface for photoelectric encoder in the spaceflight camera
2009
In order to make photoelectric encoder usable in a spaceflight camera which adopts CAN bus as the communication
method, CAN bus interface of the photoelectric encoder is designed in this paper. CAN bus interface hardware circuit of
photoelectric encoder consists of CAN bus controller SJA 1000, CAN bus transceiver TJA1050 and singlechip. CAN bus
interface controlling software program is completed in C language. A ten-meter shield twisted pair line is used as the
transmission medium in the spaceflight camera, and speed rate is 600kbps.The experiments show that: the photoelectric
encoder with CAN bus interface which has the advantages of more reliability, real-time, transfer rate and transfer
distance overcomes communication line's shortcomings of classical photoelectric encoder system. The system works
well in automatic measuring and controlling system.
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