Nzira yekugadzirisa sei kugadzikana kwechiratidzo chekufambisa kwechiratidzo che LED?Iyo inomhanya ye LED inoratidzira inongoerekana yaonekwa yakasvibiswa nekuda kwematambudziko echiratidzo.Kana iri pamutambo wekuzarura unokosha, kurasikirwa hakugadzirisiki.Maitiro ekuona kuvimbika uye kugadzikana kwekufambiswa kwechiratidzo chave nyaya hombe kune mainjiniya kugadzirisa.Mukufambisa kwekufambisa, chiratidzo chinopera simba sezvo chinhambwe chinowedzera, saka kusarudzwa kwepakati pekufambisa kunonyanya kukosha.

1. Kudzikiswa kwechiratidzo che LED: Hazvina kuoma kunzwisisa kuti zvisinei kuti svikiro rinoshandiswa kutapurirana, chiratidzo chinodzikamisa panguva yekufambisa.Tinogona kuona iyo RS-485 yekufambisa tambo sedunhu rakaenzana rinoumbwa neakati wandei resistors, inductors uye capacitors.Kupokana kwetambo kune zvishoma pachiratidzo uye kunogona kuregererwa.Iyo yakagoverwa capacitance C yetambo inonyanya kukonzerwa newaya mbiri dzakafanana dzepairi yakamonyoroka.Kurasikirwa kwechiratidzo kunonyanya kukonzerwa neLC yakaderera-pass sefa inoumbwa neiyo yakagoverwa capacitance uye yakagoverwa inductance yetambo.Iyo yakakwirira yekutaura baud mwero, ndiko kukura kwechiratidzo chekudzikisira.Naizvozvo, kana huwandu hwe data inotapurirwa husina hukuru uye huwandu hwekutapurirana husina kunyanya kukwirira, isu tinowanzo sarudza chiyero che 9 600 bps.

2. Chiratidzo chechiratidzo mumutsara wekutaurirana we LED kuratidza skrini: Pamusoro pechiratidzo chekudzivirira, chimwe chinhu chinokanganisa kutumirwa kwechiratidzo chiratidzo chechiratidzo.Impedance mismatch uye impedance discontinuity ndizvo zvikonzero zviviri zvikuru zvinokonzeresa chiratidzo chebhazi.Chikonzero 1: Impedans kusawirirana.Impedance mismatch inonyanya kukanganisa kusawirirana pakati peiyo 485 chip uye mutsara wekutaurirana.Chikonzero chekufungisisa ndechekuti kana mutsara wekutaurirana usingaite, chiratidzo chese mutsara wekutaurirana chinokanganiswa.Kana iyi mhando yechiratidzo chekuratidzira ichitanga muenzanisi pakuiswa kweiyo 485 chip, chiratidzo chekukanganisa chichaitika.Mhinduro yedu yakajairika ndeyekuwedzera bias resistors yeimwe kuramba kune A uye B mitsetse yebhazi, uye kudhonza iwo kumusoro uye pasi zvakaparadzana, kuitira kuti pasazove neasingafungidzike masaini masaini.Chikonzero chechipiri ndechokuti impedance inorega, iyo yakafanana nekuratidzira kunokonzerwa nechiedza chichipinda mune imwe svikiro kubva kune imwe svikiro.Pakupera kwetambo yekufambisa, chiratidzo chinongoerekana chasangana nediki kana pasina tambo impedance, uye chiratidzo chinokonzeresa kuratidzwa panzvimbo ino.Iyo inowanzo shandiswa nzira yekubvisa iyi fungidziro ndeyekubatanidza terminal resistor yehukuru hwakafanana neiyo hunhu impedance yetambo pamagumo etambo kuita kuti impedance yetambo ienderere mberi.Sezvo kufambisa kwechiratidzo patambo kuri bidirectional, chinomira chinodzivirira chehukuru hwakafanana chinofanira kubatanidzwa kune rumwe rutivi rwetambo yekutaurirana.

3. Kupesvedzerwa kwesimba rakagovaniswa rechiratidzo che LED pane basa rekufambisa bhazi: Iyo tambo yekufambisa inowanzomonyoroka pairi, uye capacitance inoitika pakati pewaya mbiri dzakafanana dzepeiri yakamonyoroka.Kune zvakare yakafanana diki capacitance pakati tambo uye pasi.Sezvo chiratidzo chinofambiswa mubhazi chinoumbwa nezvakawanda zve "1" uye "0" bhiti, kana ikasangana neakakosha mabhaiti akadai se0 × 01, iyo nhanho "0" inoita kuti iyo yakagoverwa capacitance isangane nenguva yekuchaja, uye riini. simba racho Kana iyo nhanho "1" inosvika kamwe kamwe, mutero wakaunganidzwa necapacitor haugone kuburitswa munguva pfupi, izvo zvinokonzeresa deformation yechiratidzo bhiti, uye zvino inokanganisa kunaka kweiyo data data.

4. Yakareruka uye yakavimbika yekutaurirana protocol ye LED kuratidza skrini: Kana nhambwe yekutaurirana iri pfupi uye nharaunda yekushandisa isinganyanye kunetsa, isu dzimwe nguva tinongoda nyore nzira yekutaura kupedzisa mabasa ese epurojekiti, asi mazhinji nzvimbo yekushandisa haisi iyo.vavariro.Muchikamu chekutanga chepurojekiti, inopfupikiswa kana iyo wiring inyanzvi (yakadai sekuchengetedza imwe chinhambwe pakati pemutsara wechiratidzo uye tambo yemagetsi), kusagadzikana kwenzvimbo yekutaurirana, dhigirii rekuvhiringidza kutenderedza mutsara wekutaurirana, kungave mutsara wekukurukurirana unoshandisa twisted-pair shielded wire, etc. Zvinhu izvi zvose ndezvehurongwa.Kukurukurirana kwakajairika kune simba guru.Naizvozvo, zvinonyanya kukosha kugadzira yakakwana yekutaurirana protocol.