基于EnDat数据传输周期的多卡同步采集方法

Synchronous Acquisition Method between DAQ Cards Based on EnDat Data Transmission Period

在基于内置传感器的数控机床性能测试中,以三通方式采集EnDat编码器信号与其它类型编码器信号时,存在同步不准的问题,故提出了一种以EnDat信号采集卡为主卡,EnDat数据传输周期分频信号作为采样时钟的多卡同步采集方法。基于CPLD+MCU实现了EnDat数据传输周期的获取及分频电路的设计。通过在数控磨齿机上进行EnDat数据传输周期获取实验,验证了EnDat数据传输周期获取方法及分频电路设计的正确性,并在该数控磨齿机的传动链测试实验中验证了基于EnDat数据传输周期的多卡同步采集方法的可行性。

In the performance test of CNC machine tool based on built-in sensors, there exists a problem that synchronization is not accurate when EnDat encoder signal and the other encoders signal are acquired by tee way. A method is proposed that EnDat data acquisition card serves as main card, and the frequency division signal of EnDat data transmission period is used as sample clock to realize synchronous acquisition between multiple DAQ Cards. The acquisition of EnDat data transmission period and the design of frequency division circuit were realized based on CPLD＋MCU, which have been verified to be true through an experiment made on a numerical control gear grinding machine to acquire EnDat data transmission period. Moreover, the method feasibility of synchronous acquisition between multiple DAQ Cards based on EnDat data trans-mission period has been proved in the test experiment of transmission chain of the CNC gear grinding ma-chine.