PTZ Kontrol Deep Dive: RS485 Bus Kuule, Porotokolle, e Caɗeele keewɗe

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Ñalnde 18 lewru bowte hitaande 2023

RS485 ko mbaydi jokkondiral seriyooji ceertuɗi kuutortooɗi laabi ɗiɗi (ko ɓuri heewde e mum en ko A e B, walla + e -) ngam neldude dokke. Nafoore mawnde e signalaaji ceertuɗi ko mbaawka tiiɗka haɓaade jokkere enɗam.

RS485 Layer Fisik: Wonaa Wiyooji Ɗiɗi Tan

RS485 ko mbaydi jokkondiral seriyooji ceertuɗi kuutortooɗi laabi ɗiɗi (ko ɓuri heewde e mum en ko A e B, walla + e -) ngam neldude dokke. Nafoore mawnde e signalaaji ceertuɗi ko mbaawka tiiɗka haɓaade jokkere enɗam — jaɓɓotooɗo oo ina yiytoo ceerungal doole hakkunde laabi ɗiɗi ɗii wonaa doole timmuɗe jowitiiɗe e leydi. Ɗum firti ko noddaango common-mode (hono jokkere enɗam naatnde e mootorɗe ɓadiiɗe walla diƴƴe baylotooɗe) ina woppitee ɗoon e ɗoon.

Kono nafoore signaling diftoor ina ardi e njoɓdi. Bus RS485 ina ɗaɓɓi resistoruuji joofnirɗe laaɓtuɗe (ko ɓuri heewde ko 120 ohm) joɗɗinaaɗi e dame ɗiɗi ɗee kala ngam ittude ƴellitaare signaal. So tawii resistor joofnirde oo ŋakkii walla joɗɗinaama e nokku mo moƴƴaani, ƴeewndorɗe maandeeji ina ngadda boomde doosɗe — feeñninde no maandeeji ɓurɗi heewde e ŋoŋɗingol e dow osiloskoop. E nder innde gollorde, resistor termination mo ŋakki ina jeyaa e ko ɓuri heewde e sabaabuuji ŋakkeende jokkondire PTZ.

Pelco-D vs Pelco-P: Suɓngo Porotokol Wonaa Ko Ƴeewndo

Porotokolle toppitiiɗe PTZ ɓurɗe huutoreede e nder ƴeewndo kisal ko Pelco-D e Pelco-P. Kamɓe ɗiɗo fof ko porotokolle jokkondirɗe seriyooji, kono e mbaadiiji domen ceertuɗi : Pelco-D huutortoo ko mbaadi 7-bayt, Pelco-P huutortoo ko mbaadi ɓurndi famɗude. Porotokolle ɗiɗi ɗee njiidaani — so kamera oo ina wallita Pelco-D e kuutorgal innde ina nelda yamiroore Pelco-P, PTZ jaabaaki.

Ko ɓuri mettude heen ko wonde kuutoragol markeeji ceertuɗi e porotokol gootol ina waawi jogaade ceertugol laaɓtungol. Yeru, e nder won e markeeji kuutorɗe Pelco-D, koɗki njaaweeki PTZ ina seerti e koɗki, ɗum addanta ustude laaɓal ɗowgol. E nder eɓɓooji markeeji jillondirɗi, ina wasiyee hoolkisaade jokkondire porotokol marke e marke, tawa ko e miijaade ‘so ɗe fof ina mballita Pelco-D, ɗe kawri.’ Sereeji PK69 e PK68 FangService ina mballita e porotokolle Pelco-D e Pelco-P, kadi ina mbaawi waylude otomatik walla e junngo tuugnaade e marke kamera.

Ko heewi e ŋakkeende e caɗeele Flow

PTZ control ŋakkeende caɗeele ina ɗaɓɓi doggol njuɓɓudi. Yamiroore ƴeewndo caɗeele wasiyaa ko : 1 ƴeewndo layer fisik (so tawii kaɓirgal RS485 ina selli, so tawii jolngo A/B ina selli, so tawii resistor joofnirde ina joɗɗinaa); ƴeewndo layer porotokol (so tawii sifaa porotokol oo ina yahdi, so tawii njuuteendi baud ina yahdi, so tawii kode adrees oo ina selli); ƴeewndo layer kaɓirɗe (so tawii PTZ e hoore mum ina ŋakki, so tawii doole ina keewi, so tawii feccere mekanik ndee ina jammi). Ko ŋakkeende laral ɓalliwal ɓuri heewde — waylude laabi A/B ko caɗeele ɓurɗe teeŋtude sabu e ko ɓuri heewde e sahaaji PTZ ina yirloo haa jooni, ko e bannge goɗɗo tan. E nder debugging, so a tawii PTZ 'ina wirna nano' nde foti 'wirta nyaamo', ƴeewto ko adii fof wiring A/B. Haala goɗka kaawniika ko RS485 line multiplexing e jokkondire ɓoggi ɗi ngalaa golle e nder kaɓirgal reso — so tawii ɓoggi ɓoggi kuutorteeɗi ngam RS485 e nder kaɓirgal ngal ina njogii tolnooji ɓuuɓɗi ɗi njiidaani e ɓoggi domen ɗii, jokkondire signal ina mbaawi arde. FangService's PK69 series ina waɗi gollal jarriborgal kaɓirɗe RS485 mahaaɗo e nder mum, baawngal yiytude jokkondire kaɓirɗe, cirkooji juutɗi, e crossovers. E hawrude e gollal ƴeewndo porotokol, ina waawi yaawde yiytude layer ŋakkere.

Topologie Reso RS485 e Keeri Woɗɗude

Topologie bus RS485 e keeri woɗɗude ko caɗeele ɗe njiyataa no feewi e nder diisnondiral injiniyaagal. Standard RS485 ina wasiyoo topologie no bus nii — denndaangal kaɓirɗe ina kawri e doggol mawngol gootol, tawa ina waɗi resistor joofnirde e kala damal doggol mawngol ngol. Topologie hoodere (denndaangal kaɓirɗe jokkondirɗe e toɓɓere hakkundeere) ina addana ƴellitaare maandeeji, baawɗe saabaade ŋakkeende jokkondiral hay so tawii ko e nokkuuji juutɗi no feewi.

Ko ɓuri heewde e woɗɗude jokkondiral RS485 ina luurdi e njuuteendi baud. E njuuteendi baud 9600bps, distance ɓurnde mawnude ina waawi yettaade 1200 meeter ; e baud toowɗo 115200bps, distance ɓurnde mawnude ndee, ko ɓuri heewde, ɓurataa 200 meeter. So tawii kaɓirɗe PTZ e nder eɓɓoore ina ceerti e nokkuuji juutɗi, miijo-ɗee ɓeydude rewtinoowo walla ustude njuuteendi baud. Sereeji PK69 e PK68 FangService, e nder mbaadi jarribordi RS485, ina mbaawi hollirde paaraaji jokkondirɗe jooni (baud rate, bits data, bits stop, parity), wallita innjiniyankooɓe e yaawde hoolkisaade so tawii konfiguraasiyoŋ oo ina selli.

Gila e RS485 haa e IP PTZ Control: Ƴellitaare karallaagal jokkondiral

Hakkille PTZ gaadanteejo ina huutoree e bus serial RS485, kono nde kameraaji IP ɓeydii heewde, hakkilantaagal PTZ ina yahra yeeso feewde e laabi tuugiiɗi e lowre IP. IP PTZ jamaanu ina waawi heɓde yamiroore jokkondire to bannge kaɓirgal reso rewrude e porotokol ONVIF walla porotokol jeyi yeeyoowo, ɗum noon ina itta haaju e kaɓirɗe RS485 keertiiɗe.

Kono RS485 majjataa ko ɓooyaani. E nder njuɓɓudi HD (AHD/TVI/CVI), ɗowgol PTZ ina tuugii haa jooni e RS485 ; e nder limlebbi keewɗi e njuɓɓudiiji gaadanteeji baɗaaɗi jooni ɗii, ko RS485 tan woni feere ɗowgol. Ko ɗum waɗi, hay e jamaanu IP, ƴeewndo RS485 PTZ ina heddii e wonde karallaagal keeringal wonande inɗeele kisal. Laabi kuutorɗe jarriborɗe reso FangService ina kuutoroo jarribooji jokkondire RS485 PTZ (seriiji PK68/PK69) e jarribooji resooji IP (seriiji PK69), ina rokka kuutorɗe jarribooje timmuɗe wonande njuɓɓudiiji gaadanteeji e jamaanu ɗii fof. Wonande eɓɓaaɗe jillondirɗe baɗɗe njuɓɓudi kesiri e ɓooyndi, ngalɗoo baawngal njuɓɓudi ɗiɗi ina teskaa. View the Network Test Instruments Collection