Daisy saw yog ib qho kev teeb tsa hluav taws xob uas muaj ntau yam khoom siv txuas nrog hauv ib txoj kab, ib qho tom qab. Nws yog hu ua daisy saw vim nws zoo li cov saw ntawm paj hu ua daisy.
Cov saw daisy tuaj yeem siv rau ntau lub hom phiaj, xws li txuas ntau tus neeg hais lus rau ib lub tshuab hluav taws xob, txuas ntau lub teeb rau ib lub qhov hluav taws xob, lossis txuas ntau yam khoom siv rau ib qho chaw nres nkoj USB.
Daisy Chaining: Ib qho Primer
Daisy Chaining yog dab tsi?
Daisy chaining yog ib txoj hauv kev xaim uas muaj ntau yam khoom siv sib txuas ua ke los yog hauv ib lub nplhaib, zoo ib yam li cov paj daisy. Daisy chains tuaj yeem siv rau lub hwj chim, analog teeb liab, cov ntaub ntawv digital, lossis kev sib txuas ntawm tag nrho peb.
Hom Daisy Chains
- Daisy chains tuaj yeem siv los txuas cov khoom siv loj, xws li cov hlua hluav taws xob, los tsim ib txoj kab ntev.
- Daisy chains kuj tseem siv tau los txuas cov khoom siv hauv lub cuab yeej, xws li USB, FireWire, Thunderbolt, thiab Ethernet cables.
- Daisy chains kuj tseem siv tau los txuas cov teeb liab analog, xws li tsheb npav hluav taws xob.
- Daisy chains kuj tseem siv tau los txuas cov cim digital, xws li Serial Peripheral Interface Bus (SPI) IC.
- Daisy chains kuj siv tau los txuas MIDI li.
- Daisy chains kuj tseem siv tau los txuas JTAG integrated circuits.
- Daisy chains kuj tseem siv tau los txuas Thunderbolt li, xws li RAID arrays thiab computer saib.
- Daisy chains kuj tseem siv tau los txuas Hexbus li, xws li TI-99/4A, CC-40, thiab TI-74.
Cov txiaj ntsig ntawm Daisy Chaining
Daisy chaining tuaj yeem yog txoj hauv kev zoo los txuas ntau yam khoom siv nrog kev siv zog tsawg. Nws kuj yog ib qho txiaj ntsig zoo rau kev sib txuas cov khoom siv, vim nws yuav tsum muaj cov cables tsawg dua thiab cov khoom sib txuas dua li lwm cov txheej txheem txuas. Tsis tas li ntawd, daisy chaining tuaj yeem pab txo qis kev sib tsoo, vim nws tshem tawm qhov xav tau ntawm ntau lub cables thiab cov khoom sib txuas. Thaum kawg, daisy chaining tuaj yeem pab txo cov teeb liab poob, raws li cov teeb liab tau rov tsim dua los ntawm txhua lub cuab yeej hauv cov saw hlau.
Teeb liab kis tau tus mob: Phau ntawv ceev
Analog Signals
Thaum nws los txog rau cov teeb liab analog, qhov kev sib txuas feem ntau yog lub tsheb npav hluav taws xob yooj yim. Thiab yog tias koj tab tom cuam tshuam nrog cov saw ntawm ntau yam khoom siv, koj yuav tsum siv ib lossis ntau dua repeaters lossis amplifiers los tiv thaiv kev txo qis.
Digital Signals
Cov teeb liab digital ntawm cov khoom siv kuj tseem tuaj yeem taug kev ntawm lub tsheb npav hluav taws xob yooj yim. Nyob rau hauv cov ntaub ntawv no, koj yuav xav tau ib lub tsheb npav terminator ntawm lub xeem ntaus ntawv nyob rau hauv lub saw. Tsis zoo li cov teeb liab analog, cov teeb liab digital tuaj yeem tsim hluav taws xob (tab sis tsis hloov kho) los ntawm ib qho khoom siv hauv cov saw hlau.
Lub tswv yim rau kev xa xov hluav taws xob
Nov yog ob peb lub tswv yim kom nco ntsoov thaum cuam tshuam nrog cov teeb liab kis:
- Siv cov repeaters los yog amplifiers los tiv thaiv attenuation hauv analog signals.
- Siv lub tsheb npav terminator ntawm lub cuab yeej kawg hauv cov saw hlau rau cov teeb liab digital.
- Cov teeb liab digital tuaj yeem tsim hluav taws xob rov ua dua tshiab (tab sis tsis hloov kho) los ntawm ib qho khoom siv hauv cov saw hlau.
- Tsis txhob hnov qab mus saib Passthrough kom paub ntau ntxiv.
Daisy Chaining Hardware thiab Software
Kho vajtse
Daisy chaining hardware yog ib txoj hauv kev zoo los txuas ntau yam khoom siv rau hauv computer. Nws koom nrog kev sib txuas ntawm txhua qhov sib txuas mus rau lwm qhov zoo sib xws, tsis yog ncaj qha mus rau lub khoos phis tawj. Qhov kawg tivthaiv hauv cov saw hlau yog tib qho uas txuas ncaj qha mus rau lub khoos phis tawj. Nov yog qee qhov piv txwv ntawm kho vajtse uas tuaj yeem daisy chained:
- UART chaw nres nkoj
- SCSI
- Cov khoom siv MIDI
- SPI IC khoom
- JTAG integrated circuits
- Thunderbolt (interface)
- Hexbus
software
Daisy chaining xam kev sib tham yog lwm txoj hauv kev zoo los txuas ntau yam khoom. Nws koom nrog kev sib txuas ntau qhov kev sib tham ua ke, tso cai rau cov neeg siv nkag mus rau ntau lub tshuab ib zaug. Qhov no yog qhov tshwj xeeb tshaj yog rau cov haujlwm uas yuav tsum tau nkag mus rau ntau lub tshuab.
Daisy-Chained vs. Pigtailed Parallel-Wired Receptacles
Dab Tsi Yog Qhov Tseem Ceeb?
Thaum nws los txog rau xaim hluav taws xob receptacles, muaj ob txoj hauv kev tseem ceeb: daisy-chaining thiab txuas mus txuas. Cia wb mus saib qhov sib txawv ntawm ob:
- Daisy-chaining (los yog xaim "hauv-series") txhais tau tias txuas tag nrho cov khoom siv "kawg mus rau qhov kawg" thiab siv cov khoom sib txuas ntawm txhua qhov khoom siv los nqa tam sim no los ntawm ib lub cuab yeej mus rau lwm qhov. Yog hais tias ib qho kev sib txuas los yog cov cuab yeej hauv koob raug cuam tshuam, cov khoom siv hauv qab ntawm qhov taw tes yuav poob lub zog.
- Kev xaim hluav taws xob sib txuas txhais tau hais tias txuas cov chaw txais khoom raws ntau txoj hauv kev, yog li yog tias ib qho ntawm cov khoom siv tsis raug, lwm cov khoom siv hluav taws xob hauv Circuit Court tseem tsis cuam tshuam. Hauv ib lub voj voog sib luag, cov dej ntws tam sim no tau muab faib, yog li tsuas yog ib feem ntawm nws ntws los ntawm txhua lub cuab yeej.
Cov lus txhais
- Nyob rau hauv ib lub voj voog, qhov tam sim no uas ntws los ntawm txhua qhov ntawm cov khoom yog tib yam, thiab qhov hluav taws xob thoob plaws hauv lub voj voog yog qhov sib npaug ntawm tus neeg qhov hluav taws xob poob thoob plaws txhua qhov khoom.
- Hauv ib lub voj voog sib luag, qhov hluav taws xob thoob plaws txhua qhov ntawm cov khoom yog tib yam, thiab tag nrho cov tam sim no yog cov lej ntawm cov dej ntws los ntawm txhua qhov khoom.
Vim Li Cas Nws Tseem Ceeb?
Ob txoj kev xaim sib txawv tsis yog tsuas yog cuam tshuam los ntawm kev tawg lossis tsis ua haujlwm ntawm cov khoom sib txuas ntawm tus neeg txais khoom, tab sis kuj nyob rau hauv lawv cov khoom hluav taws xob. Paub tias yuav siv txoj kev twg tuaj yeem pab ua kom koj lub tshuab hluav taws xob muaj kev nyab xeeb thiab ua haujlwm tau zoo.
Daisy-Chaining Receptacles: Phau Ntawv Qhia Ceev
Daisy-Chaining yog dab tsi?
Daisy-chaining yog ib txoj hauv kev xaim uas cov khoom siv hluav taws xob tau xaim hauv cov koob, lossis ib qho tom qab. Qhov no yog ib txoj kev xaim siv dav siv hauv cov tsev laus thiab tseem siv niaj hnub no.
Daisy-Chaining ua haujlwm li cas?
Daisy-chaining ua haujlwm los ntawm kev sib txuas cov dawb (nruab nrab) thiab dub (kub) xov hlau ntawm lub voj voog mus rau lub receptacle cov nyiaj thiab tooj dag terminals, ntsig txog. Cov hlau dawb coj cov xaim nruab nrab ntawm lub voj voog mus rau hauv lub thawv hluav taws xob thiab txuas mus rau lub chaw txais khoom. Qhov thib ob dawb xaim txuas lub voj voog nruab nrab mus rau qhov chaw txais khoom tom ntej. Cov xov hlau dub txuas nrog cov tooj dag lossis cov xim kub kub lossis cov ntsia hlau, lossis rau cov terminals cim "Dub" lossis "Kub". Ib qho ntawm cov xov hlau dub no coj cov hluav taws xob kub los yog "nyob" xaim rau hauv lub thawv hluav taws xob thiab txuas mus rau ib qho ntawm lub chaw txais khoom "kub" lossis "dub" terminals. Qhov thib ob dub hlau txuas mus rau lub receptacle thib ob "kub" los yog "dub" davhlau ya nyob twg thiab nqa lub Circuit Court kub los yog nyob hlau txuas mus rau lub tom ntej receptacle los yog ntaus ntawv downstream.
Dab tsi yog qhov txiaj ntsig ntawm Daisy-Chaining?
Daisy-chaining yog ib txoj hauv kev zoo kom txuag tau sijhawm thiab nyiaj txiag thaum xaim hluav taws xob txais hluav taws xob. Nws yuav tsum muaj cov khoom sib txuas thiab cov xov hlau tsawg dua li "kev sib txuas" txoj hlua txuas, thiab yog txoj kev siv hluav taws xob ntau tshaj plaws ntawm cov khoom siv hluav taws xob hauv tsev.
Dab tsi yog Drawbacks ntawm Daisy-Chaining?
Lub ntsiab drawback ntawm daisy-chaining yog hais tias ib tug receptacle ua tsis tau tejyam los yog poob ib tug ntawm nws cov kev sib txuas, tag nrho cov receptacles downstream kuj yuav poob hwj chim. Tsis tas li ntawd, txoj hlua rov qab yuav tsum zam kom tsis txhob muaj kev ntseeg siab lossis tsis muaj kev nyab xeeb.
Txuas Hluav Taws Xob Receptacles nyob rau hauv Parallel
Parallel Wiring yog dab tsi?
Kev xaim hluav taws xob sib txuas yog ib txoj hauv kev txuas cov khoom siv hluav taws xob mus rau ib qho hluav taws xob, yog li yog tias ib qho khoom siv tsis ua haujlwm lossis poob lub zog, qhov seem ntawm lub Circuit Court tseem "nyob". Qhov no yog ua los ntawm kev siv twist-on connectors thiab pigtail xov hlau los txuas lub receptacle qhov nruab nrab thiab kub terminals rau lub Circuit Court kub thiab nruab nrab nyob ntawm tej.
Kev sib txuas ntawm kev sib txuas rau Receptacles hauv Parallel
Yuav kom xaim receptacles nyob rau hauv parallel, koj yuav xav tau:
- Peb nyob ntawm txhua qhov twist-on connector:
- Cov hlau dub lossis "kub" los ntawm lub voj voog nkag mus rau hauv lub thawv hluav taws xob
- Cov hlau dub lossis "kub" tawm hauv lub thawv hluav taws xob
- Ib tug luv luv dub "kub" hlau (ib tug "pigtail") uas txuas los ntawm twist-on connector mus rau lub receptacle "kub" los yog "dub" davhlau ya nyob twg
- Cov xaim dawb lossis "tsis nruab nrab" los ntawm lub voj voog nkag mus rau hauv lub thawv hluav taws xob
- Cov hlau dawb lossis "tsis nruab nrab" tawm hauv lub thawv hluav taws xob
- Ib luv luv dawb los yog "nruab nrab" xaim (ib "pigtail") uas txuas los ntawm lub twist-on connector mus rau lub receptacle nruab nrab davhlau ya nyob twg
- Plaub kab tooj liab liab qab rau grounding:
- Hauv av hauv
- Hauv av tawm
- Pem hauv ntej rau receptacle
- Hauv av rau lub thawv hluav taws xob hlau (yog tias lub thawv yog hlau tsis yog yas).
Hloov Daisy-Chained Receptacles
Yog tias koj tab tom hloov lub daisy-chained receptacle nrog ib lub tshiab xaim nyob rau hauv tib lub sijhawm, koj yuav xav tau cov ntaub ntawv saum toj no. Txoj hauv kev no yuav tsum muaj lub thawv hluav taws xob loj dua, vim nws yuav muaj ntau qhov sib txuas, cov khoom sib txuas, thiab yog li xav tau ntau chav.
Lub thawv hluav taws xob loj npaum li cas Kuv xav tau rau Pigtailing?
Xyuas qhov loj ntawm lub thawv hluav taws xob
Thaum hloov los ntawm cov khoom siv-wired mus rau qhov sib npaug-wired hluav taws xob hauv ib txoj hlua ntawm cov khoom siv, koj yuav tsum xyuas kom meej tias lub thawv hluav taws xob loj yog qhov txaus cubic inches kom muaj cov xov hlau ntxiv thiab cov khoom sib txuas. Nov yog yam koj yuav tsum paub:
- Koj yuav xav tau 3 cov xaim nruab nrab, 3 cov xov hlau kub, thiab 4 cov xaim hauv av. Tag nrho cov xaim hauv av raug suav tias yog sib npaug rau 1 ntawm cov neeg ua haujlwm loj tshaj plaws nyob rau hauv lub thawv.
- Twist-on connectors thiab cov khoom siv hluav taws xob tsis raug suav thaum suav lub thawv loj.
- Piv txwv tias lub Circuit Court yog 15A Circuit Court siv # 14 xaim, US NEC xav tau 2 cubic inches ib tus neeg xyuas pib. Qhov ntawd txhais tau tias lub thawv yuav tsum yog (2cu.in. x 7 conductor) 14 cubic inches los yog loj dua.
- Txheeb xyuas NEC thiab ELECTRICAL JUNCTION BOX HOM rau lub thawv loj rau koj cov xaim.
Txoj Cai Kev Nyab Xeeb thiab Cov Cai rau Daisy Chaining
OSHA Regulations
- OSHA Standard 29 CFR 1910.303(b)(2) hais tias cov ntaub ntawv teev npe lossis cov ntawv sau npe yuav tsum tau nruab thiab siv raws li cov lus qhia muaj nyob hauv cov npe lossis cov ntawv sau npe.
- Tus Thawj Coj OSHA, Richard Fairfax, tau hais tias cov chaw tsim khoom thiab cov chaw soj ntsuam tau lees paub hauv lub tebchaws txiav txim siab siv cov khoom siv hluav taws xob kom zoo, thiab cov UL- npe RPTs yuav tsum tau txuas ncaj qha mus rau lub chaw tsim khoom txuas mus tas li thiab tsis txuas nrog lwm cov RPTs lossis txuas nrog. rau extension cords.
NFPA Cov Cai
- Raws li NFPA 1 Standard 11.1.4, rhais chaw fais fab kais dej yuav tsum yog hom polarized lossis grounded nrog kev tiv thaiv overcurrent thiab yuav tsum tau teev tseg.
- Lawv yuav tsum tau txuas ncaj qha mus rau lub chaw txais khoom ruaj khov thiab lawv cov hlua yuav tsum tsis txhob txuas mus rau ntawm phab ntsa, qab nthab, lossis hauv pem teb, hauv qab lub qhov rooj lossis hauv pem teb, lossis raug rau ib puag ncig lossis lub cev puas tsuaj.
UL Cov Cai
- UL 1363 1.7 hais tias cord-connected RPTs tsis yog tsim los txuas rau lwm txoj hlua txuas nrog RPT.
- UL Phau Ntawv Dawb (2015-2016) hais tias cov kais dej txav tau txav tau yog tsim los txuas ncaj qha mus rau qhov chaw txuas txuas txuas txuas mus tas li thiab tsis txuas txuas nrog (daisy chained) rau lwm lub hwj huam hloov pauv lossis txuas txuas txuas ntxiv.
lwm yam Xav txog kev teem
- Lub Chaw Haujlwm Saib Xyuas Kev Ua Raws Cai los ntawm Tsoomfwv Meskas tau tshaj tawm cov ntaub ntawv "Fast Facts" hu ua Power Strips thiab Dangerous Daisy Chains. Nws hais tias feem ntau lub zog hluav taws xob lossis cov khoom tiv thaiv hluav taws xob tau pom zoo los muab lub zog rau ntau tshaj plaub lossis rau rau tus kheej thiab cov khoom siv hluav taws xob ntau dhau tuaj yeem ua rau hluav taws kub lossis tuaj yeem ua rau hluav taws xob tawg.
- OSHA 29 CFR 1910.304(b)(4) hais tias cov khoom siv hluav taws xob yuav tsum muaj qhov ntsuas ampere tsis tsawg tshaj li qhov yuav tsum tau ua. Overloading lub hwj chim sawb tsis muaj kev nyab xeeb thiab tuaj yeem tsim kev phom sij.
Kev pheej hmoo ntawm overloading thiab siv tsis raug ntawm Extension Cords
OSHA Regulations
Nws tawm tsam OSHA cov cai siv cov khoom siv uas tsis tau txais kev pom zoo los ntawm lub chaw kuaj mob uas lees paub hauv lub tebchaws. [OSHA 29 CFR 1910.303(a)]
Kev xaim ib ntus
Nco ntsoov, cov hlua txuas ntxiv tsuas yog txhais tau rau kev xaim ib ntus xwb. Tsis txhob siv 'em rau kev txuas mus tas li.
Light-duty Cords
Cov hlua hluav taws xob tsis yog siv rau kev siv ntau yam khoom, tshwj xeeb tshaj yog cov khoom siv hluav taws xob siab. Nov yog yam koj yuav tsum ua xwb:
- Siv cov hlua khi hnyav
- Txuas rau ib yam khoom ntawm ib lub sijhawm
- Xyuas kom cov hlua tuaj yeem tuav lub nra.
Cov peev txheej los xav txog thaum daws nrog Lub Hwj Chim Loj
Tsoom fwv cov koom haum
- US Department of Labor OSHA
- Office of Compliance - US Congress
Standards
- OSHA Standard Txhais
- NFPA 1 Standard
- UL 1363 Txuj
ntawm cov
- 2015-16 Phau Ntawv Qhia Txog Cov Khoom Siv Hluav Taws Xob—UL Phau Ntawv Dawb [p569]
Cov Lus Qhia Ceev
- Fast Facts - Fais fab Sawb thiab Dangerous Daisy Chains
- Ceev Facts - Cov hlua txuas txuas ntxiv ib ntus thiab cov khoom siv hluav taws xob yuav tsum tsis txhob siv rau kev txuas mus tas li
Txawv
Daisy Chain Vs Leapfrog
Daisy saw hlau yog yooj yim dua thiab yooj yim dua rau kev thov rau cov hlua khi, tshwj xeeb tshaj yog thaum txoj hlua tsis nyob hauv txoj kab ncaj nraim. Nws yuav tsum tau xaim rov qab ntev dua, uas tuaj yeem ua rau lub ntiaj teb ua txhaum yog tias tsis rub los ntawm qhov raug. Leapfrogging, ntawm qhov tod tes, hla txhua lub vaj huam sib luag thib ob kom xaim lawv ua ke ntawm txoj kev rov qab los. Nws tsis tas yuav xaim xaim rov qab thiab tso cai rau kev txuas ntxiv zoo dua ntawm cov xov hlau tom qab cov panels, txo lawv cov huab cua.
FAQ
Dab tsi yog qhov zoo ntawm daisy saw?
Qhov kom zoo dua ntawm daisy chaining yog tias nws tso cai rau ntau yam khoom siv sib txuas ua ke hauv ib qho, tso cai rau kev siv ntau dua ntawm cov peev txheej.
Puas yog daisy saw hlau txuas txuas lossis series?
Daisy chainwiring yog parallel.
Koj puas tuaj yeem daisy saw nrog cov kab sib txawv?
Tsis yog, koj tsis tuaj yeem daisy saw nrog cov kab sib txawv.
xaus
Nyob rau hauv xaus, ib tug daisy saw yog ib tug tshiab txoj hlua system siv nyob rau hauv hluav taws xob thiab hluav taws xob engineering. Nws yog ib txoj hauv kev zoo los txuas ntau yam khoom siv hauv ib ntu lossis ib lub nplhaib, thiab tuaj yeem siv rau lub zog, analog teeb liab, cov ntaub ntawv digital, lossis kev sib xyaw ua ke. Yog tias koj tab tom nrhiav siv daisy saw hauv koj cov khoom siv hluav taws xob, xyuas kom koj nkag siab txog cov hauv paus ntawm cov kab ke thiab ntau yam khoom uas ua rau nws. Tsis tas li ntawd, nco ntsoov siv qhov tseeb terminators thiab amplifiers kom ntseeg tau tias lub teeb liab tsis cuam tshuam. Nrog rau txoj kev paub thiab cov khoom siv, koj tuaj yeem yooj yim tsim ib daisy saw system uas yuav ua haujlwm rau koj cov kev xav tau.
Kuv yog Joost Nusselder, tus tsim ntawm Neaera thiab tus neeg lag luam cov ntsiab lus, txiv, thiab nyiam sim cov cuab yeej tshiab nrog guitar ntawm lub siab ntawm kuv txoj kev mob siab rau, thiab ua ke nrog kuv pab neeg, Kuv tau tsim cov ntsiab lus ntawm blog txij li xyoo 2020. los pab cov neeg nyeem siab ncaj nrog cov ntaub ntawv kaw lus thiab cov lus qhia guitar.
