MAC layer based six-channel encoder signal transmission circuit

Abstract

The invention relates to an MAC layer based six-channel encoder signal transmission circuit, and belongs to the technical field of data communication protocol conversion of robots. The MAC layer based six-channel encoder signal transmission circuit is characterized in that an MII digital signal output / input end of an FPGA chip circuit is connected with an MII digital signal input / output end of a PHY chip circuit U1; a differential MAC data frame output / input end of the PHY chip circuit U1 is connected to an RJ45 socket J1 with an isolation transformer, a first-channel to a sixth-channel 485 digital signal input / output ends of the FPGA chip circuit are connected with digital signal output / input ends of 485 transceivers U8-U13 respectively through digital photoelectric couplers U2-U7, and a serial data input / output end of the FPGA chip circuit is connected with a serial data output / input end of an EPCS configuration chip circuit. The circuit provided by the invention can convert RS485 signals of an absolute encoder into MAC data frames stably and transmit the MAC data frames. The transmission distance and the stability of encoder data are increased. Modification is carried out on the basis of the MAC layer data frames, the utilization rate of the data frames is increased, and the timeliness of data transmission and data reception is ensured.

Description

technical field [0001] The invention belongs to the technical field of robot data communication protocol conversion. Background technique [0002] It is inevitable to use various encoders in the industrial robot system, because the working environment of most industrial robots is relatively poor, and the electromagnetic interference is serious. This makes it impossible for traditional RS485, Modbus or common digital signal encoders to perform long-distance transmission in a noisy environment. In addition, the encoder data transmission of the traditional type interface (such as RS485 protocol, Mdobus, or digital pulse interface encoder) requires 4 or more signal lines for each encoder. When the electric control cabinet is far away from the mechanical body, the corresponding cable costs will increase, which increases the cost. The industrial Ethernet network has a long transmission distance and high speed, which can solve the above problems well. Therefore, this kind of cir...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a circuit of 6-way encoder signal transmission based on the MAC layer, in order to solve the problem that existing robots make traditional RS485, Modbus or common digital signal type encoders unable to operate in an environment with severe noise. The problem of long distance transmission and high cost of data cables

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