ADEPT TECHNOLOGY 10840-13102

ADEPT TECHNOLOGY 10840-13102

ADEPT TECHNOLOGY 10840-13102

ADEPT TECHNOLOGY 10840-13102

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PLC的數(shù)據(jù)通訊根本概念

1．并行通訊與串行通訊
  通訊的根本方法可分為并行通訊與串行通訊兩種方法。
  并行通訊是指數(shù)據(jù)的各個(gè)位同時(shí)進(jìn)行傳輸?shù)囊环N通訊方法
  優(yōu)點(diǎn)：傳輸速度快
  缺點(diǎn)：數(shù)據(jù)有多少位就需要多少根傳輸線，所以在位數(shù)多、傳輸間隔遠(yuǎn)時(shí)，通訊線路復(fù)雜，本錢高。
串行通訊是指數(shù)據(jù)一位一位地傳輸?shù)姆椒ā＿@種通訊方法的數(shù)據(jù)傳輸只需一、兩 根傳輸線，通訊線路簡(jiǎn)單，本錢低，特別適用于長(zhǎng)途通訊，但傳輸速度較慢。多用于傳輸間隔長(zhǎng)、低速度的場(chǎng)合。
  ２．串行通訊的類型
  目前，串行通訊主要有兩種類型：異步通訊和同步通訊。
  ３．串行通訊的銜接方法
  串行通訊有三種銜接方法：?jiǎn)喂し椒ā腚p工方法和全雙工方法。

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