RS485 ke tekanyetso ea motlakase e hlalosang karolo ea 'mele ea sebopeho, joalo ka protocol, nako, data ea serial kapa e ts'oanang, le likhokahano kaofela li hlalosoa ke moqapi kapa liprothokholo tsa maemo a holimo.RS485 e hlalosa litšoaneleho tsa motlakase tsa bakhanni le ba amohelang ba sebelisang melapo e leka-lekaneng (eo hape e bitsoang phapang) mehala ea phetiso ea lintlha tse ngata.
Melemo
1. Phetiso e fapaneng, e eketsang tšireletso ea lerata le ho fokotsa mahlaseli a lerata;
2. Lihokelo tsa sebaka se selelele, ho fihla ho limithara tse 4000 (limithara tse ka bang 1219);
3. Sekhahla sa data ho fihlela ho 10Mbps (ka har'a lisenthimithara tse 40, hoo e ka bang limithara tse 12.2);
4. Bakhanni ba bangata le ba amohelang ba ka kopanngoa le bese e le 'ngoe;
5. Mefuta e mengata e fapaneng ea mekhoa e tloaelehileng e lumella hore ho be le phapang pakeng tsa mokhanni le moamoheli, ho lumella matla a mangata a tloaelehileng-mode -7-12V.
Boemo ba pontšo
RS-485 e ka tsamaisa phetiso ea nako e telele haholo-holo ka lebaka la ts'ebeliso ea matšoao a fapaneng bakeng sa phetiso.Ha ho na le tšitiso ea lerata, phapang pakeng tsa lipontšo tse peli moleng e ntse e ka sebelisoa ho ahlola, e le hore data ea phetisetso e se ke ea khathatsoa ke lerata.
Mohala oa phapang oa RS-485 o kenyelletsa matšoao a 2 a latelang
A: Letšoao le sa furalleng
B: Letšoao la ho khutlela morao
Ho ka 'na ha boela ha e-ba le letšoao la boraro le hlokang ntlha e tloaelehileng ea litšupiso holim'a mela eohle e leka-lekaneng, e bitsoang SC kapa G, hore mela e leka-lekaneng e sebetse hantle.Letšoao lena le ka fokotsa letšoao la mokhoa o tloaelehileng o amoheloang qetellong ea ho amohela, 'me transceiver e tla sebelisa letšoao lena e le boleng ba boitsebiso ho lekanya motlakase moleng oa AB.Tekanyetso ea RS-485 e bua ka:
Haeba MARK (logic 1), motlakase oa lets'oao la mohala oa B o phahame ho feta oa A
Haeba SPACE (logic 0), mothapo oa motlakase oa mohala oa A o phahame ho feta oa B
E le hore ho se ke ha baka ho se lumellane, kopano e tloaelehileng ea ho reha mabitso ke:
TX+ / RX+ kapa D+ sebakeng sa B (pontšo ea 1 e holimo)
TX-/RX- kapa D- sebakeng sa A (boemo bo tlase ha lets'oao 0)
Threshold Voltage:
Haeba mochine oa transmitter o fumana boemo bo phahameng ba logic (DI=1), mohala oa A o phahame ho feta oa B (VOA> VOB);haeba mochine oa transmitter o fumana logic e tlaase (DI=0), mohala oa A o phahame ho feta oa B (VOA> VOB);B voltage e phahame ho feta line A (VOB>VOA).Haeba motlakase oa mohala oa A ho kenyelletsoa ha moamoheli o phahame ho feta oa mohala oa B (VIA-VIB> 200mV), tlhahiso ea moamoheli ke boemo bo phahameng ba logic (RO = 1);haeba motlakase oa mohala oa B ka ho kenya letsoho ho moamoheli o phahame ho feta oa mola A (VIB-VIA> 200mV), moamoheli o hlahisa logic ea boemo bo tlase (RO=0).
Karolo ea Mojaro (UL)
Palo e kholo ea bakhanni le ba amohelang libese tsa RS-485 e ipapisitse le litšobotsi tsa bona tsa mojaro.Ka bobeli meroalo ea mokhanni le ea moamoheli e lekantsoe ho latela meroalo ea yuniti.Tekanyetso ea 485 e bolela hore boholo ba li-unit tse 32 li ka hokeloa beseng ea lipalangoang.
Mokhoa oa ho sebetsa
Sehokelo sa libese se ka etsoa ka mekhoa e 'meli e latelang:
Half-Duplex RS-485
Full-Duplex RS-485
Mabapi le litlhophiso tsa libese tse 'maloa tse nang le halofo ea duplex joalo ka ha ho bonts'itsoe setšoantšong se ka tlase, data e ka fetisetsoa ka lehlakoreng le le leng ka nako.
Tlhophiso ea libese tsa duplex e felletseng e bonts'itsoe setšoantšong se ka tlase, ho lumella puisano ea litsela tse peli ka nako e le 'ngoe lipakeng tsa li-master le makhoba.
Pheliso ea Libese & Bolelele ba Lekala
E le ho qoba pontšo ea pontšo, mohala oa phetisetso ea data o tlameha ho ba le ntlha ea ho qetela ha bolelele ba cable bo le telele haholo, 'me bolelele ba lekala bo lokela ho ba bokhutšoanyane ka hohle kamoo ho ka khonehang.
Pheliso e nepahetseng e hloka sehanyetsi sa pheliso ea RT se tsamaellanang le sebopeho sa impedance Z0 ea mohala oa phetisetso.
Tekanyetso ea RS-485 e khothaletsa hore Z0=120Ω bakeng sa thapo.
Likutu tsa lithapo hangata li felisitsoe ka lihanyetsi tsa 120Ω, e le 'ngoe pheletsong e' ngoe le e 'ngoe ea thapo.
Bolelele ba motlakase ba lekala (sebaka sa conductor pakeng tsa transceiver le trunk ea cable) e lokela ho ba ka tlase ho karolo ea leshome ea nako ea ho phahama ha koloi:
LStub ≤ tr * v * c/10
LStub= boholo ba bolelele ba lekala maotong
v = karo-karolelano ea lebelo leo lets'oao le tsamaeang ka lona thapo ho lebelo la khanya
c = lebelo la khanya (9.8*10^8ft/s)
Bolelele ba lekala le lelelele haholo bo tla etsa hore ponts'o ea tlhahiso ea lets'oao e ame ho impedans.Palo e latelang ke papiso ea bolelele ba lekala le bolelele ba makala a makhutšoane:
Sekhahla sa Lintlha le Bolelele ba Cable:
Ha o sebelisa litefiso tse phahameng tsa data, sebelisa lithapo tse khutšoane feela.Ha u sebelisa litefiso tse tlase tsa data, lithapo tse telele li ka sebelisoa.Bakeng sa lits'ebetso tse lebelo le tlase, khanyetso ea DC ea thapo e fokotsa bolelele ba thapo ka ho eketsa moeli oa lerata ka ho theoha ha motlakase ho theosa le thapo.Ha o sebelisa lits'ebetso tsa maemo a holimo, litlamorao tsa AC tsa boleng ba lets'oao la moeli oa cable le bolelele ba cable.Palo e ka tlase e fana ka mokhoa o tsitsitseng haholoanyane oa bolelele ba cable le sekhahla sa data.
Shenzhen Zhongling Technology Co., Ltd. (ZLTECH), ho tloha ha e thehoa ka 2013, e ikemiselitse ho sebetsa indastering ea liroboto tse mabili, ho nts'etsapele, ho hlahisa le ho rekisa li-motor hub servo motors le li-drive tse nang le ts'ebetso e tsitsitseng.Bakhanni ba eona ba likoloi tsa servo hub tse sebetsang hantle haholo ZLAC8015, ZLAC8015D le ZLAC8030L ba amohela puisano ea libese ea CAN/RS485, ka ho latellana ba tšehetsa CiA301, CiA402 sub-protocol/modbus-RTU protocol ea CANopen, mme e ka nyolohela ho lisebelisoa tse 16;taolo ea boemo ba ts'ehetso, taolo ea lebelo Le taolo ea torque le mekhoa e meng ea ho sebetsa, e loketseng liroboto ka linako tse fapaneng, ho khothaletsa haholo nts'etsopele ea indasteri ea liroboto.Bakeng sa tlhaiso-leseling e batsi mabapi le li-drive tsa wheel hub servo tsa ZLTECH, ka kopo ela hloko: www.zlrobotmotor.com.
Nako ea poso: Aug-04-2022