摘要: http://www.chipkin.com/rs485-cables-why-you-need-3-wires-for-2-two-wire-rs485/ RS485 needs 3 conductors and a shield. Many people say its a two wire n 阅读全文
posted @ 2016-09-12 17:52 aardvark 阅读(6381) 评论(0) 推荐(0) 编辑