发表于:2003-12-25 09:27:00
43楼
RS-232、RS-422与RS-485标准及应用
http://www.chinakong.net/artical/bus/120.asp
工业自动化系列专业参考书籍
http://www.icpdas.com.cn/products/books/book_c.htm
RS422/485 Application Note
http://www.bb-elec.com/tech_articles/rs422_485_app_note/table_of_contents.asp?PathId=593