Yintoni iprotokholi yonxibelelwano yeModbus-RTU yemitha yokuhamba kweLanry?

I-Modbus protocol lulwimi olusetyenziswa kwihlabathi liphela kubalawuli be-elektroniki. Ngale protocol, abalawuli banokunxibelelana kunye nezinye izixhobo ngenethiwekhi (njenge-Ethernet). Ibe ngumgangatho weshishini jikelele. Le protocol ichaza umlawuli oqondayo ngesakhiwo semiyalezo esetyenziswayo, nokuba inethiwekhi banxibelelana ngayo. Ichaza indlela umlawuli acela ngayo ukufikelela kwezinye izixhobo, indlela yokuphendula kwizicelo ezivela kwezinye izixhobo, kunye nendlela yokufumanisa nokubhala iimpazamo. Ichaza iskimu yedomeyini yomyalezo kunye nefomathi eqhelekileyo yomxholo. Xa unxibelelana ngenethiwekhi yeModBus, le protocol imisela ukuba umlawuli ngamnye kufuneka azi idilesi yesixhobo sakhe, aqaphele imiyalezo ethunyelwe yidilesi, kwaye amisele ukuba zeziphi izenzo ekufuneka zithathwe. Ukuba impendulo iyafuneka, umlawuli uvelisa umyalezo wempendulo aze awuthumele esebenzisa iModBus. Kwezinye iinethiwekhi, imiyalezo equlethe i-Modbus protocol iguqulwa ibe yifreyimu okanye izakhiwo zepakethi ezisetyenziswa kuloo nethiwekhi. Olu tshintsho lukwandisa indlela ethile yenethiwekhi yokusombulula iidilesi zecandelo, iindlela zokuhambisa, kunye nokuchongwa kweempazamo. Inethiwekhi yeModBus inomphathi omnye kuphela kwaye zonke izithuthi zihanjiswa nguye. Inethiwekhi inokuxhasa ukuya kuthi ga kwi-247 remote slave controllers, kodwa inani langempela labalawuli be-slave abaxhaswayo lixhomekeke kwizixhobo zonxibelelwano ezisetyenzisiweyo. Ngokusebenzisa le nkqubo, iPC nganye inokutshintshiselana ngolwazi ne-central host ngaphandle kokuchaphazela iPC nganye ukuba yenze imisebenzi yayo yokulawula.

Kukho iindlela ezimbini onokukhetha kuzo kwinkqubo yeModBus: i-ASCII (ikhowudi yokutshintshana kolwazi lwaseMelika) kunye ne-RTU (isixhobo seRemote Terminal). Iimveliso zethu zihlala zisebenzisa imo ye-RTU kunxibelelwano, kwaye i-byte nganye ye-8Bit kumyalezo ineempawu ezimbini ze-4Bit hexadecimal. Inzuzo ephambili yale ndlela kukuba inokudlulisa idatha engaphezulu ngesantya esifanayo se-baud kunendlela ye-ASCII.