Control LinearModule with RS485
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 I had moved the grbl into the linear module, u can control 999 modules on a rs485 bus. Video: https://m5stack.oss-cn-shenzhen.aliyuncs.com/video/Blog/Twitch201904/LinearModule_RS485.mp4 
 Twitter: https://twitter.com/M5Stack/status/1121796847087960064