CAN Bus vs RS-485 Ko tēhea te Kawa Whakawhitiwhiti Kōrero e Pai Ake Ana

Te Mārama ki te Pahi CAN

Tirohanga Whānui

He rawe te CAN Bus nā te mea he pūnaha maha-matua. Ko te tikanga he maha ngā taputapu ka taea te kōrero me te kore e hiahiatia he kaiwhakahaere matua kotahi. Ka whakamahia e ia te tirotiro hapa atamai hei tuku raraunga pono. Engari ko te arotahi ki te pūtake mai, ki te wāhi e haere atu ai rānei ngā karere, ka tirohia e ia te mea e kīia ana e te karere. Nā tēnei ka pai mō ngā mahi wā-tūturu.

He hanganga kua whakaritea te pūnaha CAN. Ka whakamahia e ia ngā anga raraunga me ngā wāhanga pēnei i ngā ID me ngā āpure raraunga. Ka āwhina ēnei wāhanga ki te whakarōpū i ngā karere me te pupuri i te rere pai o ngā mea. Mai i tōna tīmatanga i te tau 1993, kua tino pai ake te pūnaha. I te tau 2018, i puta mai te putanga CAN XL, ā, i eke ki te tere o te 10 Mbps.

Ngā Āhuatanga Matua

He āhuatanga motuhake tō te CAN Bus. He pūnaha pāho tōna e whakamahia ana, kia taea ai e ngā taputapu katoa te whakarongo ki ngā karere. Mā tēnei ka ngāwari te mahi tahi a ngā taputapu. Ka whakatikahia hoki e ia ngā hapa, he mea nui tēnei mō te haumaru.

Ko tētahi atu āhuatanga pai ko tōna ngāwari. Ka taea e koe te hono i ētahi taputapu, maha rānei, ā, he pai te mahi. Ka penapena hiko anō hoki mā te whakaara i ētahi taputapu anake ina hiahiatia. Nā ēnei āhuatanga he kōwhiringa pai mō ngā pūnaha uaua.

Ngā tono

I hangaia tuatahitia te Pahi CAN mō ngā motuka engari kei te whakamahia i ngā wāhi katoa ināianei. Ka kitea i roto i ngā wheketere, i ngā hōhipera, me ngā whare. Hei tauira, ka āwhina i ngā ararewa kia oma haumaru, kia maeneene hoki. Nā tōna kaha ki te whakatika i a ia anō ka tino pai mō ngā mahi haumaru. Ahakoa i roto i ngā motuka, i ngā mīhini, i ngā whare rānei, e whakaatu ana te Pahi CAN i tōna whai huatanga.

Te Mārama ki te RS-485

Tirohanga Whānui

He kaha te RS-485, ā, he pai te mahi mō ngā tawhiti tawhiti. Ka whakatakotohia e ia ngā ture mō te nekehanga raraunga me te mahi a ngā tohu hiko. Ka whakahaerehia e tēnei pūnaha ngā wāhi haruru mā te whakamahi i ngā tohu taurite hei whakaiti i te haruru. Ka tukuna pono ngā raraunga mā te huri i ngā tohu hiko ki ngā tohu matihiko. Ka whakamahia e te RS-485 te ngaohiko iti rawa o te +/- 200 mV, ka ngāwari ai mō ngā tatūnga rerekē. Nā ēnei āhuatanga he kōwhiringa pai mō ngā taiao uaua.

Ngā Āhuatanga Matua

He āhuatanga whai hua a RS-485, e kiia ana ko TIA-485, ko EIA-485 rānei. Ka āraihia e ōna tohu taurite te haruru, e āwhina ana i ngā wāhi haruru. Ka taea e ngā taputapu maha te whakamahi i te whatunga kotahi, pērā i ngā pūnaha Modbus, Profibus rānei. Ka taea e te RS-485 te whakawhitiwhiti kōrero rua-ara i runga i te raina kotahi, e kiia nei ko te haurua-rua. He pai te mahi i ngā tawhiti roa, he mea pai mō ngā wheketere. Mā ēnei āhuatanga ka waiho te RS-485 hei pūnaha whai hua, pono hoki.

Ngā tono

He tino pai te RS-485 mō ngā wāhi e hiahia ana ki te whakawhitiwhiti kōrero tawhiti. E whakamahia ana i roto i ngā wheketere, i ngā pūnaha hanga whare, me ngā taputapu hiko. Ka kitea anō hoki i roto i ngā tereina me ngā mīhini hauora. Ka honoa e ia ngā taputapu maha ki te whatunga kotahi, ahakoa i ngā wāhi haruru. Hei tauira, i roto i ngā wheketere, ka honoa e ia ngā pūoko me ngā kaiwhakahaere kia mau tonu te haere o ngā mea. Ka mahi tahi te RS-485 me ngā pūnaha tawhito, ā, he māmā noa iho te whakamahi i roto i ngā ahumahi maha.

Te whakataurite i te CAN Bus me te RS-485

Ngā Reiti Raraunga

He rerekē ngā tere raraunga o te CAN Bus me te RS-485. Ka taea e te CAN Bus te eke ki te 1 Mbps. He tere rawa tēnei mō ngā motuka me ngā pūnaha wheketere. Ka taea e te RS-485 te eke ki te 40 Mbps, he tere ake tēnā. Engari ka pōturi te RS-485 i ngā tawhiti roa. Hei tauira, ka noho tonu ki te 35 Mbps mō te 10 mita. I ngā tawhiti roa, ka heke ki te 1 Mbps. He mea nui te tere me te tawhiti ina whiriwhiria ana i waenga i a rāua.

Awhe Whakawhitiwhiti Kōrero

He pai ake te mahi a te RS-485 mō ngā tawhiti tawhiti. Ka taea e te CAN Bus te tuku raraunga tata ki te 40 mita i te 1 Mbps. He pai tēnei mō ngā pūnaha iti pēnei i ngā whatunga motuka. Ka taea e te RS-485 te tuku raraunga rau mita te tawhiti. Nā tēnei ka pai mō ngā tatūnga nui pēnei i ngā wheketere, ngā pūnaha hanga whare rānei. Mena me hono e au ngā taputapu tawhiti, ka whiriwhiria e au te RS-485.

Te Whakahaere Hapa

He mea tino nui te whakahaere hapa i ngā wāhi haruru. He taputapu ā-roto kei roto i te CAN Bus hei kimi me te whakatika i ngā hapa. Ka whakahaerea e ia ngā raruraru pēnei i ngā taupatupatu karere, ngā raraunga kino rānei. Kāore i te RS-485 ēnei taputapu. Kia pono ai te RS-485, me whai taputapu, pūmanawa rānei tāpiri. Anei tētahi whakatairite māmā:

Mō ngā pūnaha haumaru, pono hoki, he pai ake ki ahau te CAN Bus.

Te Whakawhanuitanga

Ko te āheinga tauine ko te pai o te tipu o tētahi pūnaha me ngā taputapu maha atu. Mā te RS-485 ka taea e ngā taputapu maha te whakamahi i te whatunga kotahi. He pai te mahi a tēnei me ngā pūnaha pēnei i a Modbus me Profibus. Ka whakamahia e te CAN Bus he tatūnga maha-matua, kia taea ai e ngā taputapu maha te kōrero i te wā kotahi. Ka karohia hoki e ia ngā taupatupatu karere. Ka pai te tauine o ngā mea e rua, engari he pai ake te CAN Bus mō ngā pūnaha uaua e hiahia ana ki te mahi tahi i te wā tūturu.

Utu

He mea nui te utu i roto i ngā kaupapa. He iti ake te utu o te RS-485, ā, he māmā ake te whakatū. He pai te mahi tahi me ngā pūnaha tawhito, e penapena moni ana. He nui ake te utu o te CAN Bus nā ōna āhuatanga matatau. Kei roto i ēnei ko te whakatika hapa me te whakahaere i ngā taputapu maha. Mō ngā kaupapa iti te tahua, he kōwhiringa pai te RS-485. Engari mō ngā pūnaha pono me te tere, he pai te utu tāpiri mō te CAN Bus.

Te Kōwhiri i te Tikanga Tika

Ngā Tohutohu Whakatinanatanga mō te Pahi CAN

Ina whakamahia Pahi CAN, ka whai au i ētahi mahi māmā kia pai ai te mahi:

• Puritia te pūwhakawhiti kia tata ki te honongaMā te tawhiti poto ka pai ake te kounga o te tohu mā te whakaiti i ngā raruraru.

• Whakahaerehia ngā tohu CAN Bus taha-ki-tahaMā ngā tohu o te roa rite tonu ka āwhina i te karo i te pokanoa me te pupuri i te whakawhitiwhiti kōrero kia pumau.

• Tāpirihia ngā wāhanga tiaki ki ngā ara iahikoKa tiakina te pūnaha e te diode TVS mai i ngā pikinga ngaohiko i ngā āhuatanga uaua.

• Whakamahia ngā ātete tika ki ngā pito rainaKa aukati ēnei i ngā haruru hiko, ā, ka mārama tonu ngā tohu.

Mā ēnei tohutohu ka Pahi CAN kaha, pono hoki, ahakoa i roto i ngā whakatakotoranga uaua.

Ngā Tohutohu Whakatinanatanga mō te RS-485

Mō RS-485, ka whakamahia e au ngā tikanga ngāwari hei whakapai ake i tana mahi i roto i ngā pūnaha haruru, ngā pūnaha whānui rānei:

• Kōwhiria ngā taura takirua miroKa whakaitihia e ēnei taura te haruru hiko, kia mārama ai ngā tohu i ngā tawhiti roa.

• Whakatūria te whakahāngaitanga haumaru-koreMā tēnei ka noho pumau te pūnaha ina kore he pūrere e tuku raraunga ana.

• Akohia ngā momo haruruMā te mōhio ki te rerekētanga i waenga i te haruru rerekētanga me te haruru aratau ka āwhina i te whakatika i ngā raruraru motuhake.

Ka āwhina ēnei mahi RS-485 kia mau tonu te pono, ahakoa i roto i ngā taiao uaua. Mā te whai i ēnei tohutohu ka pumau te pūnaha whakawhitiwhiti kōrero.

Ngā Whakamahinga Pai rawa atu mō te Pahi CAN

Ka tūtohu ahau kia whakamahia Pahi CAN i ngā āhuatanga e hiahia ana kia tere, kia kore he hapa te whakawhitiwhiti kōrero. He pai ake te mahi mō:

• Ngā motuka me ngā wakaKa hono i ngā pūoko me ngā kaiwhakahaere mō te whakawhitiwhiti kōrero tere me te pono.

• Ngā mīhini wheketereHe tino pai mō te whakarite i ngā mīhini e hiahia ana ki te wā tika.

• Ngā taputapu hauoraMā tēnei ka tere te tohatoha raraunga tika a ngā taputapu nui i roto i te hauora.

Nā tōna kaha ki te whakatika hapa me te whakahaere pai i ngā karere, he mea tino pai mō ngā mahi e aro ana ki te haumaru.

Ngā Whakamahinga Pai rawa atu mō te RS-485

RS-485 He mea tino pai mō ngā wāhi e hiahia ana ki te whakawhitiwhiti kōrero tawhiti me te utu iti. He mea tino whai hua mō:

• Ngā pūnaha hanga whareKa hono i ngā mea pēnei i te whakamahana me te whakamārama puta noa i ngā wāhi whānui.

• Ngā taputapu pūngaoKa hono i ngā mita me ngā pūmana i roto i ngā whatunga hiko me ngā pūnaha hiko pūngao rā.

• Ngā pūnaha tawhitoKa mahi tahi me ngā taputapu tawhito, kia māmā ake ai te whakapai ake.

Nā tōna hoahoa māmā, pakari hoki e hanga ana RS-485 he kōwhiringa mohio mō te maha o ngā ahumahi.

Ngā Māramatanga a te Tohunga o BSLBATT

I BSLBATT, kua whakamahia e au ngā mea e rua Pahi CAN me RS-485 i roto i ngā kaupapa maha. He kaha anō tō ia kaupapa. Mā te whiriwhiri i te mea tika ka taea te whakapai ake i te mahi a te pūnaha. Anei ētahi tohutohu mai i aku wheako.

Tohutohu: Kōwhiria te kawa e tika ana mō ngā hiahia o tō kaupapa. Ka āwhina tēnei ki te penapena moni, ā, ka whakapiki ake i te mahi.

He aha te mea motuhake ai te pahi CAN

Ka tūtohu ahau Pahi CAN mō ngā pūnaha e hiahia ana ki te whakawhitiwhiti kōrero tere me te pono. Nā ōna pūkenga whakatika hapa he mea tino pai mō ngā mahi haumaru. Hei tauira, i roto i ngā motuka hiko, Pahi CAN hono i te pūnaha pākahiko me ētahi atu wāhanga. Mā tēnei ka whakarite kia haumaru, kia tika hoki te tiritiri raraunga, he mea tino nui tēnei.

He aha te whai huatanga o te RS-485

RS-485 he pai rawa atu mō te tuku raraunga i ngā tawhiti tawhiti. Kua whakamahia e au i roto i ngā pūnaha rā hei hono i ngā kaitahuri me ngā aroturuki puta noa i ngā wāhi whānui. He māmā noa iho, he iti hoki te utu, he mea tino pai mō te tahua iti.

Mai i taku mahi, he tino āwhina te mōhio ki ngā mahi tino pai a ia kawa. I BSLBATT, ko taku whāinga tonu he waihanga i ngā otinga e tika ana mō ia kaupapa. Mā tēnei ka pono ngā pūnaha, ā, ka pai te mahi i ngā wā katoa.

Te whiriwhiri i waenga i Pahi CAN me RS-485 kei runga i ngā mea e hiahiatia ana e te pūnaha. Pahi CAN he mea tino pai mō te whakawhitiwhiti kōrero tere, kore hapa hoki. RS-485 he pai te mahi mō ngā tawhiti roa, ā, he iti hoki te utu.

TohutohuWhakamahinga Pahi CAN mō ngā mahi nui pēnei i ngā pūnaha motuka. Kōwhiria RS-485 mō ngā whatunga māmā e kapi ana i ngā rohe whānui.

Ngā Pātai Auau

He aha te rerekētanga matua i waenga i te CAN Bus me te RS-485?

Ko te rerekētanga matua kei roto i ō rātou kaha. Pahi CAN He tino pai mō te whakawhitiwhiti kōrero i te wā tūturu, me te kore hapa. RS-485 he pai ake te mahi mō ngā tawhiti roa, ā, he pai ake hoki mō te tahua.

Ka taea e au te whakamahi i ngā kawa e rua i roto i te pūnaha kotahi?

Āe, ka taea e ngā mea e rua te mahi tahi. Hei tauira, ka whakamahia e au Pahi CAN mō ngā mahi nui me ngā RS-485 mō te tuku raraunga ki tawhiti i roto i te pūnaha kotahi.

Ko tēhea kawa he māmā ake te whakatū?

RS-485 he māmā ake te whakatū. He iti ake te uaua o ngā taputapu me ngā pūmanawa e hiahiatia ana i tērā Pahi CAN, kia pai ake ai mō ngā pūnaha taketake.

TohutohuWhakamahinga RS-485 mō ngā whakaritenga ngāwari me Pahi CAN mō ngā pūnaha matatau e hiahia ana ki te haumaru me te tere.