资料链接:《485转232通讯问题》http://wenku.baidu.com/link?url=6Q8raMO3j3vhFodfZqAJb6nAi-cQ98iZUOqZjOqPuXrR1h8iVAmLZAexiAqwDDaOEBfjCKLpCa4E5eUvffWSakiQlbVynuBGTs-RiKgJNA7
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