RS485 chiyero chemagetsi chinotsanangura chimiro chechimiro chechimiro, senge protocol, nguva, serial kana parallel data, uye zvinongedzo zvinotsanangurwa nemugadziri kana yepamusoro-layer protocol.RS485 inotsanangura maitiro emagetsi evatyairi uye vanogamuchira vachishandisa yakaenzana (inonziwo mutsauko) multipoint transmisheni mitsetse.
Zvakanakira
1. Differential transmission, iyo inowedzera ruzha kudzivirirwa uye inoderedza ruzha rwemagetsi;
2. Kureba-kure zvinongedzo, kusvika ku4000 tsoka (anenge 1219 metres);
3. Data rate kusvika 10Mbps (mukati 40 inches, anenge 12.2 metres);
4. Vatyairi vakawanda uye vanogamuchira vanogona kubatanidzwa kune rimwe bhazi;
5. Iyo yakawanda yakajairika-modhi yakawanda inobvumira pasi inogona kusiyana pakati pemutyairi nemugamuchiri, ichibvumira yakawandisa common-mode voltage ye -7-12V.
Signal level
RS-485 inogona kuita kuendesa kure-kure zvakanyanya nekuda kwekushandiswa kwemasaini masaini ekutapurirana.Kana paine kupindira kweruzha, musiyano pakati pezviratidziro zviviri pamutsetse unogona kushandiswa kutonga, kuitira kuti data rekutapurirana rirege kukanganiswa neruzha.
Iyo RS-485 yekusiyanisa mutsara inosanganisira inotevera 2 masaini
A: Chiratidzo chisingadzokeri shure
B: Reverse chiratidzo
Panogona zvakare kuve nechiratidzo chechitatu chinoda chinongedzo chakafanana pamitsara yese yakadzikama, inonzi SC kana G, kuti mitsetse yakadzikama ishande nemazvo.Ichi chiratidzo chinogona kudzikamisa iyo yakajairika-modhi chiratidzo chinogamuchirwa pamagumo ekugamuchira, uye transceiver achashandisa iyi chiratidzo seyereferensi kukosha kuyera voltage pamutsetse weAB.Iyo RS-485 yakajairwa inotaura:
Kana MARK (logic 1), mutsara B chiratidzo chemagetsi chakakwira kupfuura mutsetse A
Kana SPACE (logic 0), mutsara A chiratidzo chemagetsi chakakwira kupfuura mutsetse B
Kuti usakonzere kusawirirana, gungano rezita rinozivikanwa nderokuti:
TX+ / RX+ kana D+ pachinzvimbo cheB (chiratidzo 1 chakakwira)
TX-/RX- kana D- pachinzvimbo cheA (yakaderera mwero kana chiratidzo 0)
Threshold Voltage:
Kana iyo transmitter yekupinza ikagamuchira logic yakakwira mwero (DI=1), mutsara A voltage wakakwira kupfuura mutsara B (VOA> VOB);kana iyo transmitter inopinza ikagamuchira logic yakaderera mwero (DI=0), iyo mutsara A voltage yakakwira kupfuura mutsara B (VOA> VOB);B voltage yakakwirira kudarika mutsetse A (VOB>VOA).Kana iyo voltage yemutsara A pakuiswa kweanogamuchira yakakwira kupfuura iyo yemutsara B (VIA-VIB> 200mV), kubuda kweanogamuchira ipfungwa yepamusoro yepamusoro (RO = 1);kana iyo voltage yemutsara B pakuiswa kweanogamuchira yakakwira kupfuura iyo yemutsara A (VIB-VIA> 200mV), iyo inogamuchira inoburitsa logic yakaderera mwero (RO=0).
Mutoro Wechikamu (UL)
Huwandu hwehuwandu hwevatyairi uye vanogamuchira mubhazi reRS-485 zvinoenderana nehunhu hwavo hwekutakura.Zvose zvinotakura mutyairi uye zvinogamuchira zvinoyerwa zvichienderana nekutakura kweyuniti.Iyo 485 yakajairwa inotaura kuti huwandu hwe32 unit mitoro inogona kusungirirwa kune bhazi rekufambisa.
Operating Mode
Iyo bhazi interface inogona kugadzirwa nenzira mbiri dzinotevera:
Hafu-Duplex RS-485
Yakazara-Duplex RS-485
Nezve akati wandei hafu-duplex mabhazi magadzirirwo sezvakaratidzwa mumufananidzo uri pazasi, data inogona kungotamiswa munzira imwe panguva.
Iyo yakazara-duplex bhazi gadziriso inoratidzwa mumufananidzo uri pazasi, ichibvumira nzira mbiri panguva imwe chete kutaurirana pakati patenzi nenhapwa node.
Kumiswa kweBhazi & Hurefu hweBazi
Kuti udzivise kuratidzwa kwechiratidzo, mutsara wekutumira data unofanirwa kuva nenzvimbo yekupedzisira kana urefu hwetambo hwakareba kwazvo, uye kureba kwebazi kunofanirwa kunge kupfupi sezvinobvira.
Kumisa chaiko kunoda yekumisa resistor RT inofananidzwa nehunhu impedance Z0 yemutsetse wekutapurirana.
Iyo RS-485 chiyero inokurudzira kuti Z0=120Ω yetambo.
Huru dzetambo dzinowanzomiswa ne120Ω resistors, imwe kumagumo etambo.
Kureba kwemagetsi kwebazi (conductor kureba pakati petransceiver netambo trunk) inofanira kunge isingasviki chikamu chimwe mugumi chenguva yekusimuka kwekutyaira:
LStub ≤ tr * v * c/10
LStub= kureba kwebazi mutsoka
v = chiyero cheyero iyo chiratidzo chinofamba patambo kusvika kumhanya kwechiedza
c = kumhanya kwechiedza (9.8*10^8ft/s)
Kureba kwebazi kureba kunokonzeresa kuburitsa chiratidzo kukanganisa impedance.Iyi inotevera nhamba inofananidzwa yehurefu hwebazi rehurefu uye mapfupi marefu ebazi waveforms:
Data Rate & Cable Length:
Paunenge uchishandisa data yakakwirira, shandisa tambo pfupi chete.Paunenge uchishandisa yakaderera data mitengo, tambo refu dzinogona kushandiswa.Kune yakaderera kumhanya maapplication, iyo DC kuramba kwetambo inodzika tambo kureba nekuwedzera ruzha margin kuburikidza nekudonha kwevolti patambo.Paunenge uchishandisa yakakwirira-reti maapplication, iyo AC mhedzisiro yetambo muganho wechiratidzo chemhando uye inodzika tambo kureba.Nhamba iri pazasi inopa yakawedzera kuchengetedza curve yehurefu hwetambo uye chiyero chedata.
Shenzhen Zhongling Technology Co., Ltd. (ZLTECH), kubvira payakavambwa muna 2013, yakazvipira kune indasitiri yemarobhoti, kugadzira, kugadzira uye kutengesa mavhiri hub servo motors uye madhiraivha ane mashandiro akagadzikana.Yayo yepamusoro-inoshanda servo hub mota vatyairi ZLAC8015, ZLAC8015D uye ZLAC8030L inotora CAN/RS485 kutaurirana kwebhazi, zvichiteerana inotsigira CiA301, CiA402 sub-protocol/modbus-RTU protocol yeCANopen protocol, uye inogona kukwira kusvika kumichina gumi nematanhatu;tsigira chinzvimbo chekutonga, kukurumidza kudzora Uye torque kutonga uye mamwe mamodhi ekushanda, akakodzera marobhoti muzviitiko zvakasiyana, achisimudzira zvikuru kusimudzira kweindasitiri yemarobhoti.Kuti uwane rumwe ruzivo nezve ZLTECH's vhiri hub servo madhiraivha, ndapota teerera: www.zlrobotmotor.com.
Nguva yekutumira: Aug-04-2022