Opta RS485Another configuration of the Arduino® Opta® microPLC.Links https://store-usa.arduino.cc/products/opta-rs485?_gl=1%2At8jjn5%2A_ga%2AMzc3ODM2OTMyLjE3MDk2NTQ2MjI.%2A_ga_NEXN8H46L5%2AMTcxMzIwODYwNS43LjEuMTcxMzIwOTc1My4wLjAuNzAzMjkzODc3
