Modbus i runga i te RS485: Aratohu Tātari Hōhonu me te Whakatinanatanga

Kei te whanake tonu te ao o te aunoatanga ahumahi, ā, kei te ngākau o te whakawhitiwhiti kōrero whai hua i roto i ngā pūnaha aunoatanga ko te kawa pakari o Modbus i runga i te RS485. Kua roa tēnei kawa whakawhitiwhiti kōrero e tū pakari ana, ā, he mea nui mō te whakawhitiwhiti kōrero raupapa korekore i waenga i ngā momo taputapu.

I whakawhanakehia tuatahitia a Modbus i te mutunga o te tekau tau atu i 1970 e Modicon (ināianei ko Schneider Electric), ā, i hangaia kia taea ai te whakawhitiwhiti raraunga ōrite i roto i ngā pūnaha aunoa. Nā te whakakotahitanga o tēnei me te paerewa RS485 pakari kua whakaratohia he tikanga pono, whai hua hoki mō ngā ahumahi mō te whakawhitiwhiti i waenga i ngā taputapu.

Ko te whāinga o tēnei aratohu he tuku i tētahi māramatanga matatini ki ngā tohunga o te rāngai whakahaere ahumahi mō Modbus i runga i te RS485. Ka rukuhia e mātou ōna wāhanga, ōna tikanga, me āna tono mahi, me te whakanui i tōna hiranga pumau i roto i te ao aunoa o ēnei rā.

Te tango matua

1.  Kia mārama ki ngā kaupapa matua o ngā kawa RS485 me Modbus.
2. Akohia ngā painga o te whakamahi i a Modbus i runga ake i te RS485 i roto i te aunoatanga ahumahi.
3. Whiwhi māramatanga ki te wikitoria i ngā wero whakatinanatanga noa.
4. Whakatauritea a Modbus ki runga i te RS485 me ētahi atu kawa whakawhitiwhiti kōrero.
5. Tūhurahia ngā tono mahi me ngā tūmanakohanga ā muri ake nei o Modbus mā runga i te RS485.
6. 
   

He aha te RS485?

7. He kawa rongonui te paerewa RS485 mō te whakawhitiwhiti kōrero raupapa, i hangaia hei tuku raraunga puta noa i ngā tawhiti roa. Ko ngā mātāpono taketake o te RS485 e ahu mai ana i te tohu rerekētanga, he huarahi e whakarei ake ana i te ātete haruru. Mā te whakamahi i ngā takirua rerekētanga hei tuku tohu, ka taea e te RS485 te whakaiti i te pokanoa e tūpono ana ki ngā taiao ahumahi.
   
   
8. Ko tētahi āhuatanga motuhake o te paerewa RS485 ko tōna āhua haurua-rua. I roto i te pūnaha haurua-rua, ka taea te tuku raraunga i ngā taha e rua, engari kāore i te wā kotahi. Mā tēnei whakaritenga ka mārama, ka ārai hoki i te tukinga raraunga, he mea nui rawa atu i roto i ngā whakatakotoranga uaua.
   
   
9. He rite tonu te RS485 ki te whakawhitiwhiti kōrero tawhiti. Ka taea e ia te pupuri i te tuku raraunga pono puta noa i te tawhiti tae atu ki te 4000 putu, ā, he mea tino nui i roto i ngā tono nui ina ngoikore ētahi atu paerewa whakawhitiwhiti kōrero.
   
   

Āhuatanga	Whakamārama
Paerewa RS485	Kawa mō te tawhiti pono whakawhitiwhiti kōrero raupapa.
Tohu Rerekētanga	Whakarei ake ārai haruru, he mea nui i roto i ngā taiao ahumahi.
Haurua-Duplex	Ka āhei te whakawhiti raraunga e rua ngā taha engari kāore i te wā kotahi.
Ārai i te Haruru	Ka whakaiti i te pokanoa, ka whakarite i te pono o ngā raraunga.
Whakawhitiwhiti Kōrero Tawhiti	Whai hua te tuku raraunga i ngā tawhiti whānui.

10. Ko te tikanga, he otinga pakari te paerewa RS485 mō ngā hiahia whakawhitiwhiti kōrero tawhiti, he tino pai tana ātete ki te haruru, ā, he whakarato ratonga pono hoki i roto i ngā taiao ahumahi uaua.
    
    

He aha te Kawa Modbus?

11. Ko te kawa modbus he kawa whakawhitiwhiti kōrero e whakamahia whānuitia ana, i hangaia mō ngā taputapu ahumahi. I tīmatahia e Modicon i te tau 1979, ā, mā tēnei kawa ka taea e ngā taputapu hiko te whakawhitiwhiti kōrero pai i roto i te whatunga, ahakoa ngā rerekētanga o ngā kaihanga.
    
    
12. Ko tētahi āhuatanga matua o te kawa modbus ko tōna hoahoa matua-pononga. I roto i tēnei tatūnga, ka whakahaerehia te whatunga e te pūrere matua, ka tukuna ngā whakahau ki tētahi, neke atu rānei, me te whiwhi raraunga mai i tētahi, neke atu rānei o ngā pūrere pononga. Ka taea anake e ia pononga te whakautu ki ngā whakahau mai i te rangatira, kia pai ai te whakawhitiwhiti raraunga me te taunga tika.
    
    
13. E rua ngā momo matua e tautokohia ana e te kawa modbus: modbus RTU me te modbus ASCII. Ka whakakōwaea e te Modbus RTU ngā raraunga i roto i te āhua rua, e whakapai ake ana i te tere o te tuku raraunga me te whakaiti i ngā whakaroa. I tetahi atu taha, ka whakamahia e te modbus ASCII te tuhinga māori mō te whakakōwae raraunga, kia māmā ake ai te pānui me te patuiro engari he puhoi ake i te modbus RTU.
    
    
14. He whānuitia te whakaaetia o tēnei kawa whakawhitiwhiti kōrero maha-whakamahinga puta noa i ngā pūnaha whakahaere ahumahi. Nā tōna ngāwari ki te whakatū me te tiaki, me te kaha ki te whakauru atu ki ngā taputapu maha, kua waiho hei tikanga whakawhitiwhiti kōrero paerewa i roto i ngā ahumahi mai i te hanga ki te whakahaere pūngao.

15. 
    

He aha te Modbus RS-485?

Mā te whakakotahi i te kawa Modbus me te paparanga ā-tinana RS485 ka hangaia he hoahoa whakawhitiwhiti kōrero whai hua e mōhiotia ana ko Modbus RS-485. E whakamahia whānuitia ana tēnei whakaurunga i roto i ngā pūnaha whakahaere ahumahi, e whakamahi ana i ngā kaha o ngā hangarau e rua hei whakarei ake i te tuku raraunga me te pono o te pūnaha.

Ko te ataahua o te RS485 kei roto i tana āhua whatunga maha-taka, e āhei ai ngā taputapu maha ki te hono i runga i te pahi kotahi. He tino pai tēnei whakaritenga mō te kawa Modbus, e āhei ai te whakawhitiwhiti kōrero māmā i waenga i ngā taputapu maha me te kore e uaua te whirihoranga matua-pononga. Mā te tautoko i te 32 ngā pona i runga i te wāhanga whatunga kotahi, ka arotauhia e Modbus RS-485 te whai huatanga me te tauine o ngā pūnaha whakahaere ahumahi.

Ko tētahi o ngā āhuatanga tino hira o Modbus i runga i te RS485 ko ana tikanga kaha ki te kimi hapa. Ka whakarite te kawa i te pono o ngā raraunga mā roto i ngā rautaki maha pērā i ngā tirotiro ōrite me ngā tirotiro tauutuutu hurihuri (CRC). He mea nui ēnei tikanga kimi hapa hei pupuri i te whakawhitiwhiti kōrero pono i roto i ngā taiao e pāngia ana e te haruru hiko me ētahi atu pokanoa.

Ko tētahi atu āhuatanga nui o Modbus RS-485 ko te whakamutu pahi. Mā te whakamutu tika ka whakarite i te pono o te tohu mā te ārai i ngā whakaata tohu ka taea te whakapōturi i te tuku raraunga. I te nuinga o te wā, ka whakanohoia ngā ātete whakamutu ki ngā pito o te pahi RS485 kia ōrite ki te aukati taura, ā, ka whakarei ake i te mahi whānui o te whatunga Modbus.

Hei whakarāpopototanga, ka honoa e Modbus RS-485 te kawa Modbus pakari me te paparanga tinana RS485 maha-whakamahinga, ka whakatū i tētahi otinga whakawhitiwhiti pono me te whai hua mō ngā tono whakahaere ahumahi. Ko tana tautoko mō ngā whirihoranga maha-taka, ngā tikanga kimi hapa whānui, me te whakamutu pahi e tika ana e whakaatu ana i tōna hiranga ki te whakarei ake i te mahi me te pono o te pūnaha.

Ngā tikanga o te Modbus i runga i te RS485

Ko te whakawhitiwhiti kōrero i waenga i te taputapu matua modbus me ngā taputapu pononga modbus i roto i te whatunga RS485 he tikanga taipitopito hei whakarite i te whakawhitiwhiti raraunga whai hua. Ko te ngako o tēnei whakawhitiwhiti kōrero kei roto i te anga raraunga, e kawe ana i ngā raraunga hanganga mai i te rangatira ki te pononga, me te ritenga ke.

He maha ngā wāhanga matua o tētahi anga raraunga noa i roto i te Modbus: te wāhitau o te pūrere, te waehere mahi, ngā raraunga, me te tirotiro crc. Ka tautuhia e te wāhitau o te pūrere te kaiwhiwhi e hiahiatia ana, ko te waehere mahi ia e tohu ana i te mahi hei mahi. Ka whakaemihia e ngā raraunga ngā mōhiohio e tika ana mō taua mahi, ā, ka whakarite te CRC (Cyclic Redundancy Check) i te pono o ngā raraunga mā te kite i ngā hapa i te wā e tukuna ana.

He mea nui te tirotiro crc mō te kimi hapa. Mā tēnei uara rua-paita e tāpirihia ana ki te pito o te anga raraunga ka taea e ngā taputapu te manatoko i te tika o ngā raraunga kua riro mai, ka whakarei ake i te pono o te whakawhitiwhiti kōrero.

Ko ngā whakaritenga pūmārō mō te whakatinanatanga o te Modbus RS485 ko te tauranga raupapa mō ia pūrere me ngā taura e tika ana hei hono i te whatunga. Ko te puranga kawa i runga i ngā pūrere matua me ngā pūrere pononga e whakahaere ana i tēnei whakawhitiwhiti kōrero, e whakarite ana kia tika te hanga, te tuku, me te whiwhi i ngā anga raraunga.

Anei tētahi whakamārama taipitopito mō te hanganga anga raraunga Modbus RS485:

Ko te whakatinanatanga pai o te Modbus mā te RS485 me mārama ki ēnei wāhanga me ō rātou tūranga i roto i te puranga kawa. Mā te tukutahi i waenga i te taputapu me te pūmanawa ka whakarite kia pai te whakawhitiwhiti kōrero, ka waiho te Modbus mā te RS485 hei otinga pakari mō ngā tono ahumahi.

He aha i whiriwhiri ai i a Modbus i runga i te RS485?

Ngā Auahatanga Hou me te Tirohanga ki te Ao o Muri Mai