Takardar bayanan RS485

RS485 wani ma'aunin lantarki ne wanda ke bayyana Layer na zahiri na mu'amala, kamar yarjejeniya, lokaci, bayanan serial ko layi daya, da kuma hanyoyin haɗin gwiwa duk an ayyana su ta hanyar ƙira ko ƙa'idodi mafi girma.RS485 yana bayyana halayen lantarki na direbobi da masu karɓa ta amfani da ma'auni (wanda ake kira bambanci) layukan watsa multipoint.

Amfani

1. Bambance-bambancen watsawa, wanda ke kara yawan rigakafi na amo kuma yana rage amo radiation;
2. Hanyoyi masu nisa, har zuwa ƙafa 4000 (kimanin mita 1219);
3. Adadin bayanai har zuwa 10Mbps (a cikin inci 40, kimanin mita 12.2);
4. Ana iya haɗa direbobi da masu karɓa da yawa zuwa bas ɗaya;
5. Faɗin yanayin yanayin gama gari yana ba da damar bambance-bambancen yuwuwar ƙasa tsakanin direba da mai karɓa, yana ba da damar matsakaicin matsakaicin ƙarfin yanayin gama-gari na -7-12V.

Matsayin sigina

RS-485 na iya aiwatar da watsa mai nisa musamman saboda amfani da sigina daban-daban don watsawa.Lokacin da akwai tsangwama amo, ana iya amfani da bambanci tsakanin sigina biyu akan layi don yin hukunci, don kada amo bayanan da ke watsawa su damu.

Layin bambancin RS-485 ya haɗa da sigina 2 masu zuwa

A: Sigina mara juyi
B: Juya sigina
Hakanan ana iya samun sigina na uku wanda ke buƙatar maƙasudin maƙasudin gama gari akan duk madaidaitan layukan, da ake kira SC ko G, don madaidaitan layukan suyi aiki yadda yakamata.Wannan sigina na iya iyakance siginar gama gari da aka karɓa a ƙarshen karɓa, kuma mai ɗaukar hoto zai yi amfani da wannan siginar azaman ƙimar tunani don auna ƙarfin lantarki akan layin AB.Ma'aunin RS-485 ya ambaci:
Idan MARK (hankali 1), ƙarfin siginar layin B ya fi layin A
Idan SPACE (hankali 0), layin A siginar ƙarfin lantarki ya fi layin B
Domin kada a haifar da sabani, babban taron suna shine:
TX+/RX+ ko D+ maimakon B (alamar 1 tana da girma)
TX-/RX- ko D- maimakon A (ƙananan matakin lokacin sigina 0)

Ƙarfin Wuta:
Idan shigar da mai watsawa ya sami babban matakin hankali (DI=1), layin A yana da girma fiye da layin B (VOA>VOB);idan shigarwar mai watsawa ya karɓi ƙananan matakin hankali (DI=0), layin A yana da girma fiye da layin B (VOA>VOB);Wutar lantarki B ya fi layin A (VOB>VOA).Idan ƙarfin lantarki na layin A a shigar da mai karɓa ya fi na layin B (VIA-VIB>200mV), fitowar mai karɓa shine babban matakin hankali (RO = 1);idan wutar lantarki na layin B a shigar da mai karɓa ya fi na layin A (VIB-VIA>200mV), mai karɓa yana fitar da ƙananan matakan hankali (RO=0).

Load ɗin Naúrar (UL)

Matsakaicin adadin direbobi da masu karɓa akan bas ɗin RS-485 ya dogara da halayen nauyin su.Dukansu nauyin direba da mai karɓa ana auna su dangane da nauyin naúrar.Ma'auni na 485 ya nuna cewa ana iya haɗa matsakaicin nauyin raka'a 32 zuwa bas ɗin watsawa.

Yanayin Aiki

Za a iya tsara hanyar haɗin bas ta hanyoyi biyu masu zuwa:
Half-Duplex RS-485
Cikakken Duplex RS-485
Game da jeri na bas-duplex da yawa kamar yadda aka nuna a hoton da ke ƙasa, ana iya canja wurin bayanai ta hanya ɗaya kawai a lokaci guda.

Ana nuna tsarin bas mai cikakken duplex a cikin hoton da ke ƙasa, yana ba da damar sadarwa ta hanyoyi biyu a lokaci guda tsakanin kuɗaɗen master da bayi.

Karshen Bus & Tsawon Reshe

Don guje wa tunanin siginar, layin watsa bayanai dole ne ya kasance yana da ƙarshen ƙarshen lokacin da tsayin kebul ɗin ya yi tsayi sosai, kuma tsayin reshe ya kamata ya zama ɗan gajeren lokaci.
Madaidaicin ƙarewa yana buƙatar mai tsayayyar ƙarewa RT wanda ya dace da siffar impedance Z0 na layin watsawa.
Ma'aunin RS-485 yana ba da shawarar cewa Z0=120Ω don kebul.
Yawancin kututturen kebul ana ƙarewa tare da 120Ω resistors, ɗaya a kowane ƙarshen kebul ɗin.

Tsawon wutar lantarki na reshe (nisa mai gudanarwa tsakanin transceiver da akwati na USB) yakamata ya zama ƙasa da kashi ɗaya cikin goma na lokacin tashin tuƙi:
LStub ≤ tr * v * c/10
LStub= matsakaicin tsayin reshe a ƙafafu
v = rabon adadin da siginar ke tafiya akan kebul zuwa saurin haske
c = gudun haske (9.8*10^8ft/s)
Tsawon reshe da yawa zai haifar da tunanin fitar da sigina ya shafi rashin ƙarfi.Hoto mai zuwa shine kwatancin tsayin reshe da gajeriyar raƙuman raƙuman raƙuman ruwa:

Adadin Bayanai & Tsawon Kebul:
Lokacin amfani da ƙimar bayanai masu girma, yi amfani da gajerun igiyoyi kawai.Lokacin amfani da ƙananan ƙimar bayanai, ana iya amfani da igiyoyi masu tsayi.Don aikace-aikacen ƙananan saurin gudu, juriyar DC na kebul yana iyakance tsawon kebul ta ƙara ƙarar ƙararrawa ta hanyar juzu'in wutar lantarki a cikin kebul ɗin.Lokacin amfani da aikace-aikace masu ƙima, tasirin AC na kebul yana iyakance ingancin sigina da iyakance tsawon kebul.Hoton da ke ƙasa yana ba da ƙarin ra'ayin mazan jiya na tsawon kebul da ƙimar bayanai.

Shenzhen Zhongling Technology Co., Ltd. (ZLTECH), tun lokacin da aka kafa shi a cikin 2013, ya himmantu ga masana'antar mutum-mutumi, haɓakawa, samarwa da siyar da injin cibiya servo da tuki tare da ingantaccen aiki.Its high-performance servo hub motor drivers ZLAC8015, ZLAC8015D da ZLAC8030L dauko CAN/RS485 bas sadarwa, bi da bi suna goyan bayan CiA301, CiA402 sub-protocol/modbus-RTU yarjejeniya na CANopen yarjejeniya, da kuma iya hawa zuwa 16 na'urorin.kulawar matsayi na goyon baya, sarrafa saurin sauri Da kuma sarrafa juzu'i da sauran hanyoyin aiki, masu dacewa da mutummutumi a lokuta daban-daban, suna haɓaka haɓakar masana'antar robot.Don ƙarin bayani game da faifan ƙafafun servo na ZLTECH, da fatan za a kula: www.zlrobotmotor.com.