This is a multi-part message in MIME format. ------=_NextPart_000_0038_01C1FC30.49D1CAC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello,=20 My equipment based on MCS51( micro-controller with serial port RxD and = TxD) needs to communicate with some machine by X protocol. But, I have = not any experience for X.=20 In my case, how do I build the communication? Where can I find relevant = guide or tutorial on internet? Thanks a lot for help and suggestion. Frank=20 ------=_NextPart_000_0038_01C1FC30.49D1CAC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content=3D"text/html; charset=3Diso-8859-1" = http-equiv=3DContent-Type> <META content=3D"MSHTML 5.00.2614.3500" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Hello, </FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>My equipment based on MCS51( = micro-controller with=20 serial port RxD and TxD) needs to communicate with some machine by = X=20 protocol. But, I have not any experience for X. </FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>In my case, how do I build the = communication?=20 Where can I find relevant guide or tutorial on = internet?</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Thanks a lot for help and = suggestion.</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>Frank</FONT> </DIV></BODY></HTML> ------=_NextPart_000_0038_01C1FC30.49D1CAC0--