I tried at real simulation same thing happens.One byte is sent from A, that is received by B. B sends one byte, and that is received by A. A sends one byte but this byte is not received by B. No more communication happens. 24 Haziran 2009 13:20 tarihinde Yusuf =D6zkay yazd= =FD: > I put pullup and pulldown with 4k7 and I put 1k between A and B lines. It > didn't work. I will try it in real simulation now. Hope it works. > Thanks. > > 24 Haziran 2009 13:09 tarihinde Dario Greggio yazd=FD: > > Yusuf =D6zkay ha scritto: >> > I am doing simulation at proteus and i didn't connect pullups to the A >> and B >> > lines.I have connected pullup only to the RX pins. Is =FEt necessary at >> > simulation? >> >> >> Oh well, i don't know: but, without them, A and B will float and the >> receiver will get "spurious bytes" thus causing the RX errors... >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist