Yintoni ujongano lweRS-485? Ziziphi iimpawu zayo xa kuthelekiswa ne-RS-232-C interface? Ngenxa yembonakalo yokuqala yomgangatho wojongano lwe-RS-232-C, kukho iintsilelo ngokungaphephekiyo, ingakumbi ezibandakanya ezi ngongoma zine zilandelayo: (1) Inqanaba lophawu lojongano luphezulu, olulula ukonakalisa itshiphu yesekethe yojongano. , kwaye ngenxa yokuba ayihambelani nenqanaba le-TTL, kuyimfuneko ukusebenzisa i-level conversion circuit ukudibanisa ne-TTL circuit. (2) Isantya sothumelo siphantsi. Kwi-asynchronous transmission, izinga le-baud yi-20Kbps. (3) I-interface isebenzisa umgca wesignali kunye nomgca wokubuyisela umqondiso ukwenza ifom yokuhanjiswa komhlaba eqhelekileyo. Oku kuhanjiswa komhlaba oqhelekileyo kuqhelene nokuphazamiseka kwemowudi eqhelekileyo, ngoko ke ukuxhathisa kokuphazamiseka kwengxolo kubuthathaka. (4) Umgama wothumelo ulinganiselwe. Ixabiso eliqhelekileyo lomgama ogqithisiweyo wothumelo yimitha ye-50, kodwa ingasetyenziselwa kuphela malunga neemitha ezingama-50. Ngenxa yokusilela kwe-RS-232-C, kuye kwavela imigangatho emitsha yojongano, kwaye iRS-485 yenye yazo. Inezi mpawu zilandelayo: 1. Iimpawu zombane ze-RS-485: i-logic "1" imelwe ngumahluko ombane phakathi kwemigca emibini njengoko + (2-6) V; Ingqiqo "0" imelwe ngumahluko wombane phakathi kwemigca emibini engu-(2-6) V. Inqanaba lesignali yojongano lingaphantsi kweRS-232-C, ngoko akukho lula ukonakalisa i-chip ye-chip. i-interface yesekethe, kwaye eli nqanaba liyahambelana nenqanaba le-TTL, elinokuthi lidityaniswe ngokulula kunye nesekethe ye-TTL. 2. Ireyithi ephezulu yokudluliselwa kwedatha ye-RS-485 yi-10 MB PS3. I-interface ye-RS-485 yindibaniselwano yomqhubi olungeleleneyo kunye ne-receiver eyahlukileyo, ephucula i-anti-common mode interference ability, oko kukuthi, ukukwazi ukuphazamisa ukuchasana kwengxolo kulungile. 4. Ixabiso eliqhelekileyo lomgama ogqithisiweyo wokuhanjiswa kwe-RS-485 interface yi-4,000 yeenyawo, enokufikelela ngokwenene kwi-3,000 yeemitha. Ukongezelela, i-interface ye-RS-232-C ivunyelwe kuphela ukudibanisa i-transceiver enye kwibhasi, oko kukuthi, isikhululo esisodwa samandla. I-interface ye-RS-485 ivumela ukudibanisa ukuya kwi-128 transceivers kwibhasi. Oko kukuthi, inekhono lezikhululo ezininzi, ukwenzela ukuba abasebenzisi banokuseka lula uthungelwano lwezixhobo ngokusebenzisa ujongano olulodwa lwe-RS-485. I-RS-485 i-interface yi-interface ye-serial ekhethiweyo ngenxa yokuphazamiseka kwayo okulungileyo kokuchasana nengxolo, umgama omde wothumelo kunye nekhono lezikhululo ezininzi. Ngenxa yokuba i-half-duplex network yenziwe ngojongano lwe-RS485 ifuna iingcingo ezimbini kuphela, i-RS485 yojongano yonke ithatha uthungelwano olujijekileyo olukhuselweyo. I-9-core plug socket ye-DB-9 isetyenziselwa i-RS485 isinxibelelanisi sojongano, i-DB-9 (umngxuma) isetyenziselwa ujongano kunye ne-terminal ekrelekrele RS485, kunye ne-DB-9 (iphini) isetyenziselwa ujongano lwekhibhodi RS485 edityaniswe nekhibhodi.