在串行通信时,要求通信双方都采用一个标准接口,使不同的设备可以方便地连接起来进行通信。在设计通信接口时,一般都采用标准接口以提高其通用性。本系统中,上、下位机进行通信首先面临的问题就是通信标准的选择问题。
1、RS-232C接口标准
RS-232C接口标准(全称EIA-RS-232C标准)是在1969年由美国电子工业联合会(EIA,ElectronicIndustrialAssociate-RecommendedStandard-232C)与Bell公司、调制解调器厂家及计算机终端生产厂家共同开发的用于串行接口的通信协议。它最初是为远程通信连接数据终端设备DTE(DataTerminalEquipment)和数据通信设备DCE(DataCommunicationEquipment)而制定的[46]。虽然这个标准的制定没有考虑计算机系统的应用要求,但是广泛的用于计算机与终端或外设之间的连接。
 
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