Ma ka ʻoihana pūnaewele o nā mea, ʻoiai ʻoe he ʻenekini i hoʻopili ʻia, e ʻike ʻia ʻoe i ka RS232, RS485, TTL i kēia mau manaʻo.
Loaʻa iā ʻoe kēia manaʻo ma Baidu huli iā ia, ma lalo no ʻoe e hoʻonohonoho i ka RS232 a me RS485, TTL interface ʻokoʻa.
ʻO nā hiʻohiʻona uila o ka interface RS232 ʻO ka volta o kekahi laina hōʻailona ma RS-232-C he pilina loiloi maikaʻi ʻole.
ʻO ia hoʻi, ʻo ka logical “1″ ka -3 a -15V, a ʻo ka logical “0″ mai ka 3 a hiki i ka 15V.Hoʻohālikelike ʻia nā mea hoʻohui RS-232-C i nā mea hoʻopaʻa plug DB-9, e hoʻopili pinepine ʻia ma ka hope DCE a me nā kumu ma ka hopena DTE.ʻO ke awa RS-232 o ka PC he kumu koila 9-core.Hoʻopili ʻia kekahi mau mea hana i ka interface RS-232 i ka PC no ka mea ʻekolu mau laina kikowaena e koi ʻia, ʻo ia hoʻi "hoʻouna i ka data TXD", "loaʻa ʻikepili RXD" a me "signal-to-ground GND" me ka hoʻohana ʻole ʻana i ka hōʻailona mana hoʻouna o ka ʻaoʻao ʻē aʻe.
Hoʻohana ka uwea hoʻouna RS-232 i kahi pālua wili pale.
ʻO nā hiʻohiʻona uila o ka RS485 (ʻoi aku ka maʻamau i hoʻohana ʻia i kēia manawa) RS485 hoʻohana i ka hōʻailona ʻokoʻa i ka logic maikaʻi ʻole, ʻo ka loiloi o "1″ e hōʻike ʻia e ka ʻokoʻa uila ma waena o nā laina ʻelua e like me -(2 a 6) V, a me ka loiloi "0″ ua hōʻike ʻia e ka ʻokoʻa uila ma waena o nā laina ʻelua e like me ka hoʻohui (2 a i ka 6) V. ʻO ka pae hōʻailona o ka interface ʻoi aku ka haʻahaʻa ma mua o ka RS-232-C, ʻaʻole maʻalahi ke hōʻino i ka chip kaapuni interface, a ua kūpono kēia pae me ka. ka pae TTL, hiki ke hoʻopili maʻalahi i ke kaapuni TTL.
Loaʻa i ka RS-485 ka helu kiʻekiʻe o ka hoʻololi ʻana i ka ʻikepili o 10Mbps.
Hoʻohana nui ʻia nā hōʻailona TTL pae TTL no ka mea he binary nā hōʻike ʻikepili maʻamau, me ka 5V like me ka logic “1″ a me 0V like me ka logic “0″, i kapa ʻia ʻo ttl (transistor-transistor logic level Transistor-Transistor Logic) hōʻailona. ʻōnaehana.
ʻO kēia ka ʻenehana maʻamau no ke kamaʻilio ʻana ma waena o nā ʻāpana o ka hāmeʻa i hoʻomalu ʻia e ka ʻōnaehana kamepiula.
ʻO ka ʻokoʻa ma waena o RS232 a me RS485, TTL
1, RS232, RS485, TTL e pili ana i ke kūlana pae (hōʻailona uila)
2, he haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa ka pae TTL, he 1 ka pae kiʻekiʻe (ka honua, loiloi kaapuni kikohoʻe maʻamau).
3, RS232 pae maʻamau he maikaʻi pae o 0, maikaʻi 'ole pae o 1 (i ka honua, maikai a me ka 'ole 6-15V hiki ke, a hiki i ke kūlana kū'ē kiʻekiʻe).ʻO 4, RS485 a me RS232 nā mea like, akā ʻo ka hoʻohana ʻana i ka logic hōʻailona ʻokoʻa, ʻoi aku ka kūpono no ka lōʻihi lōʻihi, ka wikiwiki wikiwiki.
Ka manawa hoʻouna: Jul-24-2019