Isixhobo esiboniswe kwi-KDPV senzelwe ukuthumela iiodolo ngokuzenzekelayo ukusuka kwisebe ukuya kwivenkile ephakathi. Ukwenza oku, kwakuyimfuneko ukuba uqale ufake iinombolo zenqaku leempahla eziyalelweyo kuyo, biza inombolo yevenkile ephakathi kwaye uthumele idatha usebenzisa umgaqo wemodem edityaniswe ngokuvakalayo. Isantya apho i-terminal ithumela khona idatha kufuneka ibe yi-300 baud. Inikwe iiseli ezine ze-mercury-zinc (ngelo xesha kwakunokwenzeka), i-voltage yento enjalo yi-1,35 V, kwaye yonke ibhetri yi-5,4 V, ngoko yonke into yasebenza ukusuka kumbane we-5 V. Ukutshintsha kukuvumela ukuba ukhethe iindlela ezintathu: i-CALC - i-calculator eqhelekileyo, i-OPER - ungafaka amanani kunye nabanye abalinganiswa, kwaye THUMELA - ukuthumela, kodwa ekuqaleni awukwazanga ukwenza isandi. Kuyacaca ukuba ngandlela ithile ungawagcina amanqaku uze uwathumele, kodwa njani? Ukuba sinokufumanisa, umbhali uya kuzama ukuhlalutya izandi , okanye ngandlel 'ithile ilungelelanise i-terminal kwiintlobo zedijithali zonxibelelwano lwabangaqeqeshwanga.
Isixhobo ukusuka kwicala elingasemva, intloko eguqukayo kunye negumbi lebhetri liyabonakala:
Eyona nto ibalulekileyo - indlela yokucofa isandi ngaphandle kwe-terminal - umbhali wafunda kumntu owayekhe waba ne-terminal efanayo. Kufuneka ufake ikhowudi yokuqalisa, kwaye emva koko ungafaka amanqaku. Sihambisa utshintsho kwindawo ye-OPER, ileta P iya kuvela Faka 0406091001 (umbhali akachazi ukuba yintoni le, mhlawumbi igama lomsebenzisi) kwaye cinezela ENT. Unobumba H uvela Faka 001290 (kwaye oku mhlawumbi igama eligqithisiweyo) kwaye cinezela ENT kwakhona. Inani elingu-0 liyavela.
Inqaku kufuneka liqale ngonobumba H okanye P (umbhali wenze impazamo apha, akukho unobumba P kwikhibhodi, kukho F), ngoko kukho amanani. Emva kokucofa iqhosha le-ENT, umgca onjenge-0004 0451 ubonakala, apho kunye nenqaku ngalinye elilandelayo inani lokuqala liyakhula kwaye okwesibini liyancipha, oku kuthetha ukuba le yinani leeseli ezihlala kunye nezikhululekile, ngokulandelanayo. Ungasebenzisa amaqhosha ukuskrola kumanqaku angenisiweyo, kodwa umbhali akazi ukuba uwacima njani (nto leyo ethetha ukuba iqhosha le-CLR alincedanga). Akuthethwa ngendlela yokubonisa ubungakanani benqaku ngalinye.
Emva kokuba ufake amanqaku, kufuneka uhambise iswitshi kwindawo ethi THUMELA kwaye ucinezele iqhosha le-SND/=. Umyalezo THUMELA BUSY uya kuboniswa kwisalathisi, kwaye ukuhanjiswa kuya kuqala:
Ithoni enezandi ze-4,4 Hz kwi-1200 s. Emva koko enye i-6 s - 1000 Hz. I-2,8 elandelayo isetyenziselwa ukuhambisa isignali emoduliweyo, ilandelwa enye i-3 s - kwakhona ihambisa ithoni ye-1000 Hz.
Ukuba ujonga ngokusondeleyo kwi-spectrum, eqinisweni, endaweni ye-1000 Hz ufumana i-980, kwaye endaweni ye-1200 - 1180. Umbhali urekhode ifayile ye-WAV, ifake inkqubo ekhankanywe ngasentla ("indoda" kuyo. ) kwaye uyiqhube ngolu hlobo:
minimodem -r -f msi55_bell103_3.wav -M 980 -S 1180 300
Yenzekile:
### CARRIER 300 @ 1000.0 Hz ###
�H00��90+�H00��90+�H00��90+�H��3�56��+�Ʊ�3�56��+��9��+�ƴ56+�H963�5���+�
### NOCARRIER ndata=74 confidence=2.026 ampl=0.147 bps=294.55 (1.8% slow) ###
Kubonakala ngathi . Nangona kukho ngokubanzi i-1070 kunye ne-1270 Hz.
Ngaba iifrikhwensi zesikhululo “zadada”? Umbhali uhlele ifayile ye-WAV ukwenzela ukuba isantya senyuke nge-1,8%. Kwavela phantse i-1000 kunye ne-1200. Uphehlelelo olutsha lwenkqubo:
minimodem -r -f msi55_bell103_4.wav -M 1000 -S 1200 300 -R 8000 -8 -startbits 1 -stopbits 1
Uye waphendula wathi:
### CARRIER 300 @ 1000.0 Hz ###
�H00��90+�H00��90+�H00��90+�H��3�56��+�Ʊ�3�56��+��9��+�ƴ56+�H963�5���+�
### NOCARRIER ndata=74 confidence=2.090 ampl=0.148 bps=299.50 (0.2% slow) ###
Kuzo zombini ezi meko, isiphumo sinentsingiselo, nangona kukho iimpazamo. Inombolo yenqaku i-H12345678 "yakhutshwa" kumqondiso njenge-H��3�56�� - amanani esikwazile ukuwenza akwiindawo zawo. Ubonelelo lwamandla lunokuba nokuhluzwa okulambathayo, okubangela ukuba imvelaphi ye-50-Hz ibekwe ngaphezulu kumqondiso. Inkqubo inika ingxelo ngexabiso eliphantsi lokuzithemba (ukuzithemba=2.090), nto leyo ebonisa uphawu olugqwethekileyo. Kodwa ngoku kucacile ukuba i-terminal ithumele njani idatha kwikhompyuter yevenkile ephakathi xa isekho.
umthombo: www.habr.com