Tsis yog, reconfiguration ntawm kev sib txuas lus tsis yog feem ntau tsis yuav tsum tau tom qab hloov lub terminating resistor nyob rau hauv kub khiav kev sib txuas lus systems. Qhov no yog vim hais tias lub terminating resistor yog ib tug passive hardware tivthaiv ntawm lub cev txheej thiab tsis khaws los yog cuam tshuam configurable tsis xws li raws tu qauv, chaw nyob, thiab baud npaum li cas.
1. Vim li cas kev kho dua tshiab feem ntau tsis tsim nyog?
Lub terminating resistor yog ib qho khoom siv nkaus xwb: Nws tsuas yog 120Ω lub cev resistor siv rau impedance txuam thiab absorbing teeb liab reflections; nws tsis yog programmable.
Nws tsis koom nrog kev sib cuam tshuam raws tu qauv: Hloov cov resistor yuav tsis hloov lub cuab yeej ntawm qhov chaw nyob, kev sib txuas lus tus nqi (xws li, 9600bps / 115.2kbps), cov ntaub ntawv hom, lossis lwm qhov chaw.
Tus thawj configuration tseem siv tau: tsuav yog tus maub los, PLC, lossis tus tswj qhov kub thiab txias tsis tau poob los yog tau rov pib dua vim lub hwj chim tsis ua hauj lwm, qhov kev sib txuas lus qub tseem tsis hloov.
Kev ua tau zoo: Hauv cov tshuab hluav taws xob kub khiav xws li Oerlikon thiab Yudo, kev sib txuas lus tsuas yog rov qab los ntawm kev hloov qhov kev txiav tawm thiab lub zog rau; tsis tas yuav nkag mus rau cov ntawv qhia zaub mov kom rov kho dua.
2. Nyob rau hauv dab tsi "reconfiguration" yuav tsum tau? Txawm hais tias tus resistor nws tus kheej tsis xav tau kev teeb tsa, cov haujlwm hauv qab no yuav raug suav tias yog "configuration xav tau" yuam kev:
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Scenario |
Yuav tsum tau Configuration |
Kev piav qhia |
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Hloov cov kev sib txuas lus module board nrog ib tug terminating resistor |
Yog lawm |
Lub rooj tsavxwm tshiab tuaj yeem muaj qhov cuam tshuam ntawm kev ua haujlwm tsis zoo los ntawm lub neej ntawd; nws yuav tsum tau enabled ntawm ib tug DIP hloov los yog software. |
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Nco ntsoov nias lub khawm pib dua lub cuab yeej thaum hloov |
Yog lawm |
Cov cuab yeej rov qab mus rau lub Hoobkas chaw; cov ntaub ntawv configuration yuav tsum tau downloaded dua. |
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Siv lub ntse transceiver module (xws li tsis siv neeg RS485 transceiver nti) |
Nyob ntawm qhov xwm txheej |
Qee qhov modules muaj ib qho ua tau - nyob rau hauv kev txiav tawm resistor pab me ntsis; tus txheej xwm sau npe yuav tsum tau lees paub. |
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Thawj qhov system cia siab rau kev tsis ncaj ncees + kev txiav tawm los ua ke kho qib |
Tsis muaj |
Txawm li cas los xij, nws yuav tsum tau kuaj xyuas seb lub rub- nce / rub- cov resistors puas puas lawm. |
Kev Siv: Qee qhov siab -kawg CAN lossis RS-485 transceiver modules (xws li RSM485PHT) txhawb kev tswj xyuas qhov kev tawm tsam kom ua rau lub xeev ntawm firmware. Hauv qhov no, tom qab hloov lub module, xyuas kom meej tias qhov kev teeb tsa zoo ib yam.
3. Yam yuav tsum tau kuaj xyuas tom qab hloov pauv (Tsis yog-Kev teeb tsa, tab sis tseem ceeb)
Txawm hais tias tsis tas yuav kho dua tshiab, cov ntawv pov thawj hauv qab no yuav tsum tau ua:
Kho lub cev sib txuas
Nruab tsuas yog ib qho 120Ω resistor ntawm txhua qhov kawg ntawm lub npav.
Cov nodes nruab nrab yog nruj me ntsis txwv tsis pub los ntawm kev sib txuas kom tsis txhob muaj kev sib txuas ua ke uas ua rau muaj qhov sib npaug qis heev.
Kev ntsuas qhov sib npaug
Tom qab fais fab -tawm, siv ib lub multimeter los ntsuas qhov tsis kam ntawm kab A thiab B → Nws yuav tsum yog kwv yees li 60Ω (ob lub 120Ω resistors nyob rau hauv parallel).
Teeb liab Waveform Observation
Siv lub oscilloscope los saib cov teeb liab sib txawv → Nws yuav tsum yog ib lub voj voog meej meej uas tsis muaj suab nrov lossis overshoot.
Kev sib txuas lus Log saib xyuas
Tom qab ua haujlwm rau ib lub sijhawm, tshawb xyuas qhov tsis txaus ntseeg ntxiv xws li "CRC yuam kev" lossis "timeout offline".
Kev Ua Zoo Tshaj Plaws: Tom qab hloov pauv, nws raug nquahu kom khiav tsawg kawg ib lub voj voog ntau lawm kom paub meej tias qhov system stability.
