He reo whānui te kawa Modbus e whakamahia ana i roto i ngā kaiwhakahaere hiko. Mā tēnei kawa, ka taea e ngā kaiwhakahaere te kōrero tetahi ki tetahi, me ētahi atu taputapu mā te whatunga (pēnei i te Ethernet). Kua noho hei paerewa ahumahi whānui. Ka tautuhia e tēnei kawa he kaiwhakahaere e mōhio ana ki te hanganga karere e whakamahia ana, ahakoa te whatunga e kōrero ana rātou. E whakaahua ana me pēhea te tono urunga a te kaiwhakahaere ki ētahi atu taputapu, me pēhea te whakautu ki ngā tono mai i ētahi atu taputapu, me pēhea te kimi me te tuhi hapa. Ka tautuhia te kaupapa rohe karere me te hōputu noa o te ihirangi. I te whakawhitiwhiti kōrero mā te whatunga ModBus, ka whakatau tēnei kawa me mōhio ia kaiwhakahaere ki te wāhitau o tā rātou taputapu, te mōhio ki ngā karere e tukuna ana e te wāhitau, me te whakatau i ngā mahi hei mahi. Mena e hiahiatia ana he whakautu, ka whakaputa te kaiwhakahaere i tētahi karere urupare ka tukuna mā te whakamahi i te ModBus. I ētahi atu whatunga, ka hurihia ngā karere kei roto te kawa Modbus ki ngā hanganga anga, ki ngā hanganga mōkihi rānei e whakamahia ana i runga i taua whatunga. Ka whakawhānuihia hoki e tēnei panonitanga te huarahi motuhake ki te whatunga ki te whakatau i ngā wāhitau wāhanga, ngā ara ara, me te kimi hapa. Kotahi anake te manaaki o te whatunga ModBus, ā, ko ngā waka katoa ka tukuna e ia. Ka taea e te whatunga te tautoko i te 247 ngā kaiwhakahaere pononga mamao, engari ko te maha tuturu o ngā kaiwhakahaere pononga e tautokona ana e whakawhirinaki ana ki ngā taputapu whakawhitiwhiti kōrero e whakamahia ana. Mā te whakamahi i tēnei pūnaha, ka taea e ia PC te whakawhitiwhiti kōrero me te kaihautū matua me te kore e pā ki ia PC ki te mahi i āna ake mahi whakahaere.
E rua ngā momo hei whiriwhiri māu i roto i te pūnaha ModBus: ASCII (American information interchange code) me RTU (Remote Terminal Device). Ko te tikanga, ka whakamahia e ā mātou hua te aratau RTU mō te whakawhitiwhiti kōrero, ā, kei roto i ia paita 8Bit i roto i te karere e rua ngā pūāhua hexadecimal 4Bit. Ko te painga matua o tēnei tikanga he nui ake ngā raraunga ka taea te tuku i te tere baud ōrite i te tikanga ASCII.
Te wā tuku: Hurae-22-2022