hi
minh dang lam do an ve truyen du lieu theo chuan rs485 1 master 2 slave, phan cung cua minh chi la 3 modul rs232 to rs485 dung de ket noi 3 may tinh lai voi nhau, 1 may lam master, 2 may con lai la slave, gio minh dang truc trac o cho la ko biet cach viec phan code truyen va nhan cua máter va slave.
co ace nao biet, xin giup minh voi, thanks nhiu!
minh co tham khao trong tai lieu nay, may ban xem thu
http://www.mediafire.com/?ni4vaoa43sihboo