Yarjejeniyar Modbus harshe ne na duniya da ake amfani da shi a cikin masu sarrafa lantarki. Ta hanyar wannan yarjejeniya, masu sarrafawa za su iya sadarwa da juna da kuma wasu na'urori ta hanyar hanyar sadarwa (kamar Ethernet). Ya zama mizani na masana'antu na duniya. Wannan yarjejeniya tana bayyana mai sarrafawa wanda ya san tsarin saƙon da ake amfani da shi, ba tare da la'akari da hanyar sadarwar da suke sadarwa a kai ba. Yana bayyana yadda mai sarrafawa ke neman damar shiga wasu na'urori, yadda ake amsa buƙatun wasu na'urori, da kuma yadda ake gano kurakurai da yin rajista. Yana ƙayyade tsarin yankin saƙon da tsarin da aka saba amfani da shi. Lokacin sadarwa ta hanyar hanyar sadarwa ta ModBus, wannan yarjejeniya tana ƙayyade cewa kowane mai sarrafawa yana buƙatar sanin adireshin na'urarsa, gane saƙonnin da aka aika ta adireshin, da kuma tantance matakan da za a ɗauka. Idan ana buƙatar amsa, mai sarrafawa yana samar da saƙon ra'ayi kuma yana aika shi ta amfani da ModBus. A wasu hanyoyin sadarwa, ana canza saƙonnin da ke ɗauke da yarjejeniyar Modbus zuwa tsarin firam ko fakiti da ake amfani da su akan wannan hanyar sadarwa. Wannan canji kuma yana faɗaɗa hanyar takamaiman hanyar sadarwa don warware adiresoshin sashe, hanyoyin hanya, da gano kurakurai. Hanyar sadarwa ta ModBus tana da mai masauki ɗaya kawai kuma duk zirga-zirgar da yake yi tana da shi. Cibiyar sadarwa za ta iya tallafawa har zuwa masu sarrafa bayin nesa guda 247, amma ainihin adadin masu sarrafa bayin da ake tallafawa ya dogara ne da kayan aikin sadarwa da ake amfani da su. Ta amfani da wannan tsarin, kowace kwamfuta za ta iya musayar bayanai da mai masaukin tsakiya ba tare da shafar kowace kwamfuta don yin ayyukan sarrafa kanta ba.
Akwai hanyoyi guda biyu da za a zaɓa daga cikin tsarin ModBus: ASCII (lambar musayar bayanai ta Amurka) da RTU (Na'urar Tashar Nesa). Kayayyakinmu gabaɗaya suna amfani da yanayin RTU don sadarwa, kuma kowace byte ta 8Bit a cikin saƙon tana ɗauke da haruffa biyu na hexadecimal na 4Bit. Babban fa'idar wannan hanyar ita ce tana iya aika ƙarin bayanai a daidai ƙimar baud fiye da hanyar ASCII.
Lokacin Saƙo: Yuli-22-2022