Iphrothokholi ye-Modbus iwulimi olusetshenziswa kakhulu kubalawuli be-elekthronikhi. Ngale phrothokholi, abalawuli bangaxhumana bodwa kanye namanye amadivayisi ngenethiwekhi (njenge-Ethernet). Sekuyindinganiso yemboni esetshenziswa kakhulu. Le phrothokholi ichaza isilawuli esiqaphela isakhiwo semiyalezo esisetshenziswayo, kungakhathaliseki ukuthi inethiwekhi baxhumana kanjani. Ichaza indlela isilawuli esicela ngayo ukufinyelela kwamanye amadivayisi, indlela yokuphendula izicelo ezivela kwamanye amadivayisi, kanye nendlela yokuthola nokufaka amaphutha. Icacisa i-schema yesizinda semiyalezo kanye nefomethi evamile yokuqukethwe. Uma ixhumana ngenethiwekhi ye-ModBus, le phrothokholi inquma ukuthi isilawuli ngasinye sidinga ukwazi ikheli laso ledivayisi, siqaphele imiyalezo ethunyelwe ngekheli, futhi sinqume ukuthi yiziphi izinyathelo okufanele sizithathe. Uma kudingeka impendulo, isilawuli sikhiqiza umlayezo wempendulo bese siwuthumela sisebenzisa i-ModBus. Kwamanye amanethiwekhi, imiyalezo equkethe iphrothokholi ye-Modbus iguqulwa ibe yizinhlaka noma izakhiwo zamaphakethe ezisetshenziswa kuleyo nethiwekhi. Lokhu kuguqulwa kwandisa nendlela ethile yenethiwekhi yokuxazulula amakheli esigaba, izindlela zokuqondisa, kanye nokutholwa kwamaphutha. Inethiwekhi ye-ModBus inomsingathi oyedwa kuphela futhi yonke ithrafikhi iqondiswa nguye. Inethiwekhi ingasekela abalawuli bezigqila abakude abangafika ku-247, kodwa inani langempela labalawuli bezigqila abasekelwayo lincike emishinini yokuxhumana esetshenziswayo. Ngokusebenzisa lolu hlelo, i-PC ngayinye ingashintshana ngolwazi ne-host ephakathi ngaphandle kokuthinta i-PC ngayinye ukwenza imisebenzi yayo yokulawula.
Kunezindlela ezimbili ongakhetha kuzo ohlelweni lwe-ModBus: i-ASCII (ikhodi yokushintshana kolwazi lwaseMelika) kanye ne-RTU (Idivayisi Yesiphetho Ekude). Imikhiqizo yethu ngokuvamile isebenzisa imodi ye-RTU yokuxhumana, futhi i-byte ngayinye ye-8Bit kumyalezo iqukethe izinhlamvu ezimbili ze-hexadecimal ze-4Bit. Inzuzo enkulu yale ndlela ukuthi ingadlulisela idatha eningi ngesilinganiso esifanayo se-baud kunendlela ye-ASCII.
Isikhathi sokuthunyelwe: Julayi-22-2022