Kodi njira yolumikizirana ya Modbus-RTU ya Lanry flow meter ndi chiyani?

Protocol ya Modbus ndi chilankhulo chapadziko lonse chomwe chimagwiritsidwa ntchito mu owongolera zamagetsi. Kudzera mu protocol iyi, owongolera amatha kulankhulana wina ndi mnzake komanso ndi zida zina kudzera pa netiweki (monga Ethernet). Yakhala muyezo wapadziko lonse wamakampani. Protocol iyi imafotokoza wowongolera yemwe amadziwa kapangidwe ka mauthenga omwe akugwiritsidwa ntchito, mosasamala kanthu za netiweki yomwe amalankhulana. Imafotokoza momwe wowongolera amapempha mwayi wopeza zida zina, momwe angayankhire zopempha kuchokera ku zida zina, komanso momwe angazindikire ndikulemba zolakwika. Imafotokoza schema ya domain ya uthenga ndi mawonekedwe wamba a zomwe zili mkati. Polankhulana kudzera pa netiweki ya ModBus, protocol iyi imatsimikiza kuti wowongolera aliyense ayenera kudziwa adilesi ya chipangizo chake, kuzindikira mauthenga otumizidwa ndi adilesi, ndikudziwa zomwe angachite. Ngati yankho likufunika, wowongolera amapanga uthenga woyankha ndikutumiza pogwiritsa ntchito ModBus. Pa netiweki zina, mauthenga okhala ndi protocol ya Modbus amasinthidwa kukhala chimango kapena mapangidwe a paketi omwe amagwiritsidwa ntchito pa netiweki imeneyo. Kusinthaku kumawonjezeranso njira yeniyeni ya netiweki yothetsera ma adilesi a magawo, njira zoyendetsera, ndi kuzindikira zolakwika. Netiweki ya ModBus ili ndi wolandila m'modzi yekha ndipo magalimoto onse amayendetsedwa ndi iye. Netiwekiyi imatha kuthandizira olamulira akutali okwana 247, koma chiwerengero chenicheni cha olamulira a ukapolo omwe amathandizidwa chimadalira zida zolumikizirana zomwe zimagwiritsidwa ntchito. Pogwiritsa ntchito njira imeneyi, PC iliyonse imatha kusinthana zambiri ndi wolandila wapakati popanda kukhudza PC iliyonse kuti igwire ntchito zake zowongolera.

Pali njira ziwiri zoti musankhe mu dongosolo la ModBus: ASCII (American information interchange code) ndi RTU (Remote Terminal Device). Zogulitsa zathu nthawi zambiri zimagwiritsa ntchito RTU mode polumikizirana, ndipo 8Bit byte iliyonse mu uthengawo ili ndi zilembo ziwiri za 4Bit hexadecimal. Ubwino waukulu wa njira iyi ndikuti imatha kutumiza deta yambiri pamlingo womwewo wa baud kuposa njira ya ASCII.