在串行通信時(shí)，要求通信雙方都采用一個(gè)標(biāo)準(zhǔn)接口，使不同的設(shè)備可以方便地連接起來進(jìn)行通信。在設(shè)計(jì)通信接口時(shí)，一般都采用標(biāo)準(zhǔn)接口以提高其通用性。本系統(tǒng)中，上、下位機(jī)進(jìn)行通信首先面臨的問題就是通信標(biāo)準(zhǔn)的選擇問題。
1、RS-232C接口標(biāo)準(zhǔn)
RS-232C接口標(biāo)準(zhǔn)（全稱EIA-RS-232C標(biāo)準(zhǔn)）是在1969年由美國電子工業(yè)聯(lián)合會(huì)（EIA，ElectronicIndustrialAssociate-RecommendedStandard-232C）與Bell公司、調(diào)制解調(diào)器廠家及計(jì)算機(jī)終端生產(chǎn)廠家共同開發(fā)的用于串行接口的通信協(xié)議。它最初是為遠(yuǎn)程通信連接數(shù)據(jù)終端設(shè)備DTE（DataTerminalEquipment）和數(shù)據(jù)通信設(shè)備DCE（DataCommunicationEquipment）而制定的[46]。雖然這個(gè)標(biāo)準(zhǔn)的制定沒有考慮計(jì)算機(jī)系統(tǒng)的應(yīng)用要求，但是廣泛的用于計(jì)算機(jī)與終端或外設(shè)之間的連接。
 
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