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修复485收发器框图路径错误

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CaoWangrenbo
2024-03-26 17:48:04 +08:00
parent 1563630ad8
commit b4b56840d5
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@@ -140,7 +140,7 @@ T_{NRST} = 20us
=== RS-485 通信接口设计
image::doc_attachments、2024-03-26T09-20-09-142Z.png[RS-485 收发器原理图]
image::doc_attachments/2024-03-26T09-20-09-142Z.png[RS-485 收发器原理图]
本设计考虑到设备在工业场景下工作的可能，并考虑到方便接入现有的现场控制总线，所以采用了工业上常用的 RS-485 总线接口。为了简化主控操作，在考虑到通常工业总线通信波特率较低的情况下，设计使用了自动换向电路，不需要主控在操作前对收发器进行读写状态转换。本设计中 RS-485 收发器选用 SP3485 芯片。该芯片内部框图如图所示、