PTZ Control Deep Dive: RS485 Bus Gɔmeɖosewo, Ðoɖowo, Kple Kuxiwo Gbɔkpɔkpɔ Si Bɔbɔe

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Dzove 18, 2023. Eƒe dukɔ nye […]

RS485 nye vovototodedeameme ƒe kadodo ƒe dzidzenu si zãa dzesi ƒe ka eve (si woyɔna zi geɖe be A kple B, alo + kple -) tsɔ ɖoa ​​nyatakakawo ɖa. Viɖe vevitɔ si le vovototodedeameme ƒe dzesiwo ŋue nye ŋutete sesẽ si tsia tre ɖe nusiwo doa kplamatse nu ŋu.

RS485 Dzɔdzɔmeŋusẽ ƒe Ƒuƒoƒo: Menye Ka Eve Koe O

RS485 nye vovototodedeameme ƒe kadodo ƒe dzidzenu si zãa dzesi ƒe ka eve (si woyɔna zi geɖe be A kple B, alo + kple -) tsɔ ɖoa ​​nyatakakawo ɖa. Viɖe vevitɔ si le vovototo ƒe dzesiwo ŋue nye ŋutete sesẽ si tsi tre ɖe nusiwo doa kplamatse nu ŋu — amesi xɔa elektrikŋusẽa dea dzesi elektrikŋusẽ ƒe vovototo si le fli eveawo dome tsɔ wu be wòakpɔ elektrikŋusẽ ƒe vovototo bliboa ne wotsɔe sɔ kple anyigba. Esia fia be woate fli ɖe toɣliɖeɖe si bɔ (abe nusiwo doa kplamatse mɔ̃ siwo te ɖe wo ŋu alo ʋu siwo ƒe tsɔtsɔme trɔna ene) me le wo ɖokui si.

Gake viɖe si le dzesidede vovototodedeameme ŋu la hea ga geɖe vɛ. RS485 bɔs la hiã be woade nuwuƒe ƒe tsitretsiɖeŋunu nyuitɔ (zi geɖe la, ohm 120) bɔs la ƒe nuwuwu eveawo be woaɖe dzesi ƒe keklẽ ɖa. Ne nuwuwu ƒe tsitretsiɖeŋula bu alo wodae ɖe teƒe si mesɔ o la, dzesi ƒe keklẽ hea nyatakakawo ƒe vodadawo vɛ — si dzena abe dzesi ƒe tsɔtsɔ wu kple ɖiɖi le oscilloscope dzi ene. Le mɔ̃ɖaŋudɔwɔwɔ ŋutɔŋutɔ me la, termination resistor si bu nye nusiwo gbɔ PTZ dziɖuɖu ƒe kpododonu tsona zi geɖe la dometɔ ɖeka.

Pelco-D vs Pelco-P: Ðoɖowɔɖi Tiatia Menye Nusi Wowɔna Le Ðokuisime O

PTZ dzikpɔkpɔ ƒe ɖoɖo siwo wozãna wu le dedienɔnɔ dzi kpɔkpɔ me enye Pelco-D kple Pelco-P. Wo ame evea siaa nye kadodomɔnu siwo kplɔ wo nɔewo ɖo, gake nyatakakawo ƒe nɔnɔme vovovowo le wo si: Pelco-D zãa byte 7 ƒe nɔnɔme, gake Pelco-P ya zãa ɖoɖo si le sue wu. Ðoɖo eveawo mewɔ ɖeka o — ne fotoɖemɔ̃a doa alɔ Pelco-D eye mɔ̃ɖaŋudɔwɔnua ɖo Pelco-P ƒe sededewo ɖa la, PTZ maɖo eŋu o.

Nusi gaɖea fu wue nye be vovototo siwo menya kpɔna dzea sii bɔbɔe o ate ŋu anɔ adzɔnu vovovowo ƒe ɖoɖo ɖeka dzi wɔwɔ me. Le kpɔɖeŋu me, le adzɔha aɖewo ƒe Pelco-D dɔwɔwɔwo me la, PTZ ƒe duƒuƒu ƒe nuŋɔŋlɔ to vovo tso dzidzenua gbɔ, si wɔnɛ be dziɖuɖu ƒe nyateƒetoto dzi ɖena kpɔtɔna. Le adzɔnu siwo ƒe ŋkɔ wotsaka ƒe dɔwo me la, wokafui be woaɖo kpe ɖoɖowɔɖi ƒe ɖekawɔwɔ dzi le adzɔnu ƒe dzesi ɖesiaɖe nu, tsɔ wu be woasusui be ‘ne wo katã wodo alɔ Pelco-D la, wosɔ.’ FangService ƒe PK69 kple PK68 ƒe hatsotsowo doa alɔ Pelco-D kple Pelco-P ɖoɖowo siaa, eye ateŋu atrɔ le eɖokui si alo kple asi le fotoɖemɔ̃ ƒe dzesi nu.

Dodokpɔ Siwo Bɔ Kple Kuxiwo Gbɔkpɔkpɔ ƒe Sisi

PTZ dziɖuɖu ƒe kpododonu ƒe kuxiwo gbɔ kpɔkpɔ bia be woawɔ ɖoɖo ɖe sisi ŋu. Kuxiwo gbɔ kpɔkpɔ ƒe ɖoɖo si wokafu enye: 1 physical layer check (ne RS485 ka la me gblẽ o, ne A/B kaƒoƒo sɔ, nenye be woda termination resistor la eme); 2 protocol layer check (ne protocol ƒomevi la sɔ, ne baud rate sɔ, ne adrɛs code la sɔ); 3 dɔwɔnuwo ƒe ƒuƒoƒo ƒe dodokpɔ (ne PTZ ŋutɔ gblẽ, ne elektrikŋusẽnamɔ̃ sɔ, nenye be mɔ̃a ƒe akpaa xe). Dzɔdzɔmeŋusẽ ƒe ƒuƒoƒo ƒe kpododonuwoe bɔ wu — A/B fli ƒe tɔtrɔ nye kuxi si me ayedzedze le wu elabena le go geɖe me la, PTZ la gakpɔtɔ trɔna, le mɔ si to vovo na ema nu ko. Le debugging me la, ne èkpɔ be PTZ la ‘trɔna ɖe miame’ evɔ wòle be ‘wòtrɔna ɖe ɖusime’ la, lé ŋku ɖe A/B kaƒoƒoa ŋu gbã. Nya bubu si bɔ enye RS485 line multiplexing kple idle wire pairs le network cable — ne ka eve siwo wozã na RS485 le cable la ƒe twist rates mewɔ ɖeka kple data pairs o la, dzesi ƒe nutete ate ŋu ado tso eme. FangService ƒe PK69 series la le RS485 ka dodokpɔ dɔwɔwɔ si wotu ɖe eme si ate ŋu ade dzesi ka ƒe yiyi, nutome kpuiwo, kple crossovers. Ne wotsɔe kpe ɖe ɖoɖowɔɖi me dzodzro ƒe dɔwɔwɔ ŋu la, ate ŋu ake ɖe kpododonu ƒe ƒuƒoƒoa ŋu kaba.

RS485 Network Topology kple Adzɔge ƒe Seɖoƒewo

RS485 bɔs ƒe nɔnɔme kple didiƒe ƒe seɖoƒewo nye mɔxenu siwo dzi woŋea aɖaba ƒuna bɔbɔe le mɔ̃ɖaŋununya ƒe ɖoɖowɔwɔ me. RS485 ƒe dzidzenu kafu bus-ƒomevi ƒe topology — mɔ̃wo katã sɔ kple wo nɔewo le fli gã ɖeka dzi, kple nuwuwu ƒe tsitretsiɖeŋula le fli gã la ƒe nuwuwu ɖesiaɖe. Ɣletivi ƒe nɔnɔme (mɔ̃ siwo katã do ƒome le wo ɖokui si ɖe titina teƒe aɖe) nana dzesiwo ƒe keklẽ, si ate ŋu ana kadodo nado kpo nu le didiƒe kpui ŋutɔ gɔ̃ hã.

RS485 ƒe kadodo ƒe didime si sɔ gbɔ wu la sɔ kple baud ƒe tsɔtsɔme le mɔ si trɔna nu. Le baud ƒe tsɔtsɔme si bɔbɔ si nye 9600bps me la, didime si sɔ gbɔ wu ateŋu aɖo meta 1200; le baud ƒe tsɔtsɔme gã si nye 115200bps me la, zi geɖe la, didime si sɔ gbɔ wu mewu meta 200 o. Ne woma PTZ mɔ̃ siwo le dɔ aɖe me ɖe didiƒe la, bu eŋu be yeatsɔ repeaters akpe ɖe eŋu alo yeaɖe baud ƒe tsɔtsɔme dzi akpɔtɔ. FangService ƒe PK69 kple PK68 ƒe hatsotsowo, le RS485 dodokpɔ ƒe nɔnɔme me, ateŋu aɖe kadodo ƒe nɔnɔme siwo li fifia (baud rate, data bits, stop bits, parity) afia, si akpe ɖe mɔ̃ɖaŋudɔwɔlawo ŋu kaba akpɔe ɖa be ɖoɖoa sɔ.

Tso RS485 dzi va ɖo IP PTZ Dziɖuɖu dzi: Kadodomɔnu ƒe Nɔnɔmetɔtrɔ

Wowɔa PTZ dziɖuɖu si wozãna tsã la ŋudɔ to RS485 serial bus dzi, gake esi IP fotoɖemɔ̃wo va bɔ la, PTZ dziɖuɖu le tɔtrɔm ɖe IP network-dzi mɔnuwo ŋu. Egbegbe IP PTZ ateŋu axɔ dziɖuɖu ƒe sededewo tẽ to network cable dzi to ONVIF protocol alo vendor-proprietary protocols dzi, si wɔnɛ be mehiã be woawɔ RS485 kaƒoƒo le wo ɖokui si o.

Gake RS485 mabu kpuie o. Le coaxial HD ɖoɖowo (AHD/TVI/CVI) me la, PTZ dziɖuɖu gakpɔtɔ nɔa te ɖe RS485 dzi; le ɖoɖo xoxo gbogbo aɖewo siwo woda ɖe eme xoxo me la, RS485 koe nye mɔnu si dzi woato akpɔ wo dzi. Eyata le IP ƒe ɣeyiɣia gɔ̃ hã me la, RS485 PTZ dziɖuɖu gakpɔtɔ nye aɖaŋu vevi aɖe na dedienɔnɔ ŋuti mɔ̃ɖaŋudɔwɔlawo. FangService ƒe network dodokpɔ dɔwɔnu ƒe fli ƒo nu tso RS485 PTZ dziɖuɖu dodokpɔ (PK68/PK69 series) kple IP network dodokpɔ (PK69 series) siaa ŋu, si naa dodokpɔ ƒe kuxiwo gbɔkpɔnu blibowo na blema kple egbegbe ɖoɖowo siaa. Le dɔ siwo wotsaka siwo me ɖoɖo yeyewo kple xoxowo siaa le gome la, asixɔxɔ eve ƒe ŋutete sia le vevie ŋutɔ. View the Network Test Instruments Collection