Kedu ihe bụ RS-485 interface? Gịnị bụ àgwà ya tụnyere RS-232-C interface? N'ihi mmalite nke ọkọlọtọ interface RS-232-C, enwere ụfọdụ adịghị ike, ọkachasị gụnyere isi ihe anọ ndị a: (1) Ọkwa mgbama nke interface dị elu, nke dị mfe imebi mgbawa nke sekit interface. , na n'ihi na ọ na-ekwekọghị na ọkwa TTL, ọ dị mkpa iji sekit ntụgharị larịị jikọọ na sekit TTL. (2) Ọnụego nnyefe dị ala. Na nnyefe asynchronous, ọnụego baud bụ 20Kbps. (3) The interface na-eji akara ngosi na akara nkwụghachi mgbama na-emepụta ụdị nnyefe ala nkịtị. Mgbasa ozi ala a na-adịkarị mfe na nnyonye anya ọnọdụ nkịtị, yabụ nguzogide mgbochi mkpọtụ adịghị ike. (4) Ogologo nnyefe nwere oke. Ọkọlọtọ uru nke ogologo nnyefe kacha bụ 50 ụkwụ, mana enwere ike iji ya naanị ihe dịka mita 50. N'ihi adịghị ike nke RS-232-C, ụfọdụ ụkpụrụ interface ọhụrụ apụtala, na RS-485 bụ otu n'ime ha. Ọ nwere àgwà ndị a: 1. Njirimara eletriki nke RS-485: mgbagha "1" na-anọchi anya ọdịiche voltaji dị n'etiti ahịrị abụọ dị ka + (2-6) V; The mgbagha "0" na-anọchi anya voltaji dị iche n'etiti abụọ ahịrị ịbụ-- (2-6) V. The interface mgbaàmà larịị dị ala karịa nke RS-232-C, n'ihi ya, ọ dịghị mfe imebi mgbawa nke mgbawa. interface sekit, na ọkwa a dakọtara na ọkwa TTL, nke enwere ike ijikọ ya na sekit TTL ngwa ngwa. 2. Ọnụego nnyefe data kachasị elu nke RS-485 bụ 10 MB PS3. Ihe RS-485 interface bụ ngwakọta nke ọkwọ ụgbọ ala kwesịrị ekwesị na onye na-anata dị iche iche, nke na-eme ka ikike nnyonye anya na-emegide ndị nkịtị, ya bụ, ikike mgbochi mkpọtụ dị mma. 4. Ụkpụrụ ọkọlọtọ nke oke nnyefe nke RS-485 interface bụ 4,000 ụkwụ, nke nwere ike iru mita 3,000 n'ezie. Na mgbakwunye, a na-ahapụ naanị interface RS-232-C iji jikọọ otu transceiver na bọs, ya bụ, ikike otu ọdụ ụgbọ. Ngwa RS-485 na-enye ohere njikọ nke ihe ruru 128 transceivers na ụgbọ ala. Ya bụ, ọ nwere ikike nke ọtụtụ ọdụ ụgbọ mmiri, nke mere na ndị ọrụ nwere ike ịmepụta netwọk akụrụngwa ngwa ngwa site na iji otu interface RS-485. RS-485 interface bụ ọkacha mmasị serial interface n'ihi na ya mma mgbochi mkpọtụ nnyonye anya, ogologo nnyefe anya na multi-ọdụ ike. N'ihi na netwọk ọkara duplex nke mejupụtara RS485 interfaces n'ozuzu chọrọ naanị wires abụọ, RS485 interfaces niile na-anakwere nnyefe ụzọ gbagọrọ agbagọ. A na-eji oghere nkwụnye 9-core nke DB-9 maka njikọ interface RS485, DB-9 (oghere) na-eji maka interface nwere ọnụ ọgụgụ nwere ọgụgụ isi RS485, na DB-9 (pin) na-eji maka keyboard interface RS485 ejikọrọ na keyboard.