Ujongano : RS232 ,RS 485 kunye neTTL

Kwishishini le-Intanethi yeZinto, okoko nje uyinjineli ebethelelwe, uya kuboniswa ngokubanzi kwi-RS232, RS485, TTL ezi ngqikelelo.

Ngaba udibene nalo mbono kwi-Baidu uyikhangele, ngezantsi ukuze uququzelele i-RS232 kunye ne-RS485, umahluko wojongano lwe-TTL.
Iimpawu zombane kwi-interface ye-RS232 I-voltage yanoma yimuphi umgca wesignali kwi-RS-232-C ubudlelwane obungenangqiqo.

Oko kukuthi, ingqiqo "1" yi -3 ukuya -15V, kwaye ingqiqo "0" isuka ku-3 ukuya kwi-15V.Izihlanganisi ze-RS-232-C ziqhele ukwenziwa imodeli yezibambi zeeplagi ze-DB-9, ziqhele ukuplaga ekupheleni kwe-DCE kunye neesokethi ekupheleni kwe-DTE.Ichweba le-RS-232 lePC liyi-9-core socket inaliti.Ezinye izixhobo ziqhagamshelwe kujongano lwe-RS-232 kwiPC kuba kufunwa imigca yojongano emithathu kuphela, eyile, "thumela idatha yeTXD", "ukufumana idatha ye-RXD" kunye "nesignal-to-ground GND" ngaphandle kokusebenzisa isiginali yolawulo losasazo elinye iqela.

Intambo yothumelo ye-RS-232 isebenzisa isibini esijijekileyo esikhuselekileyo.
Iimpawu zombane ze-RS485 (ngoku ezisetyenziswa ngokuxhaphake ujongano) I-RS485 isebenzisa ingqiqo yophawu olulandulayo, ingqiqo ethi "1" imelwe ngumahluko wombane phakathi kwemigca emibini njenge -(2 ukuya ku-6) V, kunye nengqiqo "0" imelwe ngumahluko wombane phakathi kwemigca emibini njenge-plus (2 ukuya ku-6) V. Inqanaba lesignali yojongano lingaphantsi kwe-RS-232-C, akukho lula ukonakalisa i-chip yesekethe yojongano, kwaye eli nqanaba liyahambelana inqanaba leTTL, linokudityaniswa ngokulula kwisekethe yeTTL.

I-RS-485 inezinga eliphezulu lokudlulisa idatha ye-10Mbps.
Inqanaba le-TTL imiqondiso yenqanaba le-TTL isetyenziswa kakhulu ngenxa yokuba ulwazi oluqhelekileyo lwedatha lubini, kunye ne-5V elingana nengqiqo "1" kunye ne-0V elingana nengqiqo "0", eyaziwa ngokuba yi-ttl (inqanaba le-transistor-transistor logic level Transistor-Transistor Logic) uphawu. inkqubo.

Le yiteknoloji eqhelekileyo yonxibelelwano phakathi kwamalungu esixhobo esilawulwa yiprosesa yekhompyutha.

Umahluko phakathi kwe-RS232 kunye ne-RS485, i-TTL

I-1, i-RS232, i-RS485, i-TTL ibhekisela kumgangatho wezinga (uphawu lombane)

I-2, umgangatho wezinga le-TTL ngumgangatho ophantsi we-0, umgangatho ophezulu ngu-1 (umhlaba, i-digital digital circuit logic).

I-3, inqanaba lezinga le-RS232 linqanaba elilungileyo le-0, inqanaba elibi le-1 (emhlabeni, i-positive kunye ne-negative 6-15V ingaba, kunye ne-high resistance state).I-4, i-RS485 kunye ne-RS232 iyafana, kodwa ukusetyenziswa kwengqiqo yesignali yokwahlukana, ifaneleka ngakumbi kumgama omde, ukuhanjiswa kwesantya esiphezulu.