Kuvhara Mugero: Yakakosha PLC Serial Kukurukurirana Ruzivo kune Nyanzvi dzeMagetsi
Kuvhara Mugero: Yakakosha PLC Serial Kukurukurirana Ruzivo kune Nyanzvi dzeMagetsi
Serial Kukurukurirana Basics
Kukurukurirana kweserial ndiyo yakajairika protocol kune mudziyo - kune - mudziyo wekuchinjana data. Kusiyana ne USB, makomputa mazhinji ane maviri RS232 - yakavakirwa serial ports. Serial ports anoshandiswawo zvakanyanya mukushandisa uye kure kure data - yekutora michina.
Zvikamu zvakakosha zveSerial Communication
Kuti ibudirire serial kutaurirana, iwo anotevera ma paramita anofanirwa kuenderana kune ese madoko:
Baud Rate: Inoyera data - yekufambisa kumhanya mumabhiti pasekondi. Semuenzaniso, 300 baud yakaenzana ne300 bits pasekondi. Baud rate inokanganisa zvakananga sampling frequency pane data line. High baud rates, iyo inofambisa ipfupi-chinhambwe, yakakwirira-yekumhanyisa kutaurirana, inopesana nechiyero chekufambisa.
Data Bits:Kumiririra iyo chaiyo data mukutapurirana. Hwaro hwemazuva ese 5, 7, kana 8 bits. Semuenzaniso, standard ASCII inoshandisa 7 bits, nepo ASCII yakawedzerwa inoshandisa 8. Sarudzo inotsamira pane chaiyo data - kutapurirana zvinodiwa.
Misa Bits:Maka panoperera pakiti yedata, kazhinji iine kukosha kwe1, 1.5, kana 2 bits. Vanobatsira michina kuwiriranisa wachi panguva yekukurukurirana. Mamwe mabheti ekumira anowedzera kushivirira kwewachi - misiyano yenguva asi kuderedza iyo data - chiyero chekufambisa.
Parity Bit:Chikanganiso chiri nyore - chekutarisa nzira. Sarudzo dzinosanganisira kunyange, zvisingaite, zvakakwirira, zvakaderera, kana hapana. Kunyange uye isinganzwisisike parity inoisa iyo parity bit kuti ive nechokwadi cheiyo kana isinganzwisisike nhamba yeane musoro mabheti akakwira mune data rakafambiswa. Yakakwirira uye yakaderera parity inongoisa diki kune zvine musoro kumusoro kana kudzika, zvichibvumira midziyo yekugamuchira kuti ione inogona kukanganisa kutaurirana kana desynchronization.
Common PLC Interfaces
RS - 232:Iyo RS - 232 yakajairwa yakajairika paIBM - PC uye anoenderana masisitimu. Inotsigira zvakasiyana-siyana zvekushandisa sekubatanidza mbeva, maprinta, modem, uye zviridzwa zveindasitiri. Nepo RS - 232 inogonesa point - to - point kutaurirana pakati pePC serial ports nemidziyo, kureba kwayo kwekufambisa kureba i50 tsoka.
RS - 422:RS - 422, inoshandiswa muApple Macintosh makomputa, inoshandisa kusiyanisa kusaina. Kusiyana neRS - 232's single - yakapera pasi - inonongedza siginecha, RS - 422's mutsauko wekufambisa unoshandisa mitsara miviri yekutumira nekugamuchira masaini. Izvi zvinowedzera kudzivirirwa kweruzha uye kuwedzera kureba kwekutapurirana, zvichiita kuti ive yakakodzera kune zvigadziriso zveindasitiri.
RS - 485:RS - 485 inonatsiridza paRS - 422 nekutsigira anosvika makumi matatu nemaviri midziyo uye kutsanangura hunhu hwemagetsi hwepamusoro - mudziyo - kuverenga mamiriro ekuona yakaringana chiratidzo magetsi. Iyo inobvumira kugadzirwa kwemidziyo network uchishandisa imwechete RS - 422 port. Neruzha rwakasimba - kusadzivirirwa uye akawanda-rutsigiro rwechishandiso, RS - 485 yakanakira maindasitiri ekushandisa senge kuvaka akaparadzirwa mudziyo network yakabatana nePC, data - kuunganidza controller, HMIs, uye mamwe masisitimu anoshanda. RS - 485 is a superset yeRS - 422, inogonesa kutonga kwese RS - 422 zvishandiso zvine kutapurirana madaro anodarika 4,000 tsoka.