RS485使用手册与指南广州周立功单片机发展有限公司 Tel:(020)38730977 38730977 Fax:38730925 http://www.zlgmcu.com 目 录 第1章 RS-485 选型及应用指南 .........................................................................1 1.1 RS-232/422/485 标准 ...............................................................................................1 1.1.1 RS-232 标准 .....................................................................................................2 1.1.2 RS-422/485 标准 ..............................................................................................2 1.2 RS-485/RS-422 芯片 .....................................................................................……