描述
PLC通信主要采用串行異步通信，其常用的串行通信接口標(biāo)準(zhǔn)有RS-232C、RS-422A和RS-485等。
1．RS-232C
RS-232C是美國(guó)電子工業(yè)協(xié)會(huì)EIA于1969年公布的通信協(xié)議，它的全稱是“數(shù)據(jù)終端設(shè)備（DTE）和數(shù)據(jù)通信設(shè)備（DCE）之間串行二進(jìn)制數(shù)據(jù)交換接口技術(shù)標(biāo)準(zhǔn)”。RS-232C接口標(biāo)準(zhǔn)是目前計(jì)算機(jī)和PLC中最常用的一種串行通信接口。
RS-232C采用負(fù)邏輯，用-5～-15V表示邏輯“l(fā)”，用+5～+15V表示邏輯“0”。噪聲容限為2V，即要求接收器能識(shí)別低至+3V的信號(hào)作為邏輯“0”，高到-3V的信號(hào)作為邏輯“1”。RS-232C只能進(jìn)行一對(duì)一的通信，RS-232C可使用9針或25針的D型連接器，表1列出了RS-232C接口各引腳信號(hào)的定義以及9針與25針引腳的對(duì)應(yīng)關(guān)系。PLC一般使用9針的連接器
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