低速串行總線一般僅包含網絡概念的OSI(Open System Interconnection)模(mo)型(xing)中(zhong)的(de)協(xie)議(yi)層(ceng)以(yi)下(xia)的(de)信(xin)息(xi),用(yong)戶(hu)在(zai)對(dui)變(bian)頻(pin)器(qi)進(jin)行(xing)通(tong)訊(xun)控(kong)製(zhi)時(shi)需(xu)要(yao)編(bian)寫(xie)相(xiang)應(ying)的(de)通(tong)訊(xun)程(cheng)序(xu),同(tong)時(shi)由(you)於(yu)傳(chuan)輸(shu)速(su)率(lv)較(jiao)低(di),在(zai)響(xiang)應(ying)時(shi)間(jian)要(yao)求(qiu)較(jiao)高(gao)的(de)場(chang)合(he)有(you)一(yi)定(ding)的(de)局(ju)限(xian)性(xing)。但(dan)低(di)速(su)串(chuan)行(xing)總(zong)線(xian)一(yi)般(ban)是(shi)控(kong)製(zhi)器(qi)和(he)變(bian)頻(pin)器(qi)的(de)基(ji)本(ben)配(pei)置(zhi),無(wu)需(xu)增(zeng)加(jia)額(e)外(wai)成(cheng)本(ben),在(zai)價(jia)格(ge)上(shang)有(you)明(ming)顯(xian)的(de)優(you)勢(shi)。