Hi there all, thanx for all the help, I have another question.

I need to setup a protocol between two devices one being the uart of the 8051 the other being a device that accepts strings, similar to a modem (i.e must recognise "connect" string and "ok" string)

I have set up the UART that works fine I can transmit from the Micro, I have also enabled the uart interupt so that the Micro will emediatly know when a device has connected or data has been sent(i.e. recieved at the SBUF) but when using the interupt vector the program always hangs/halts when I attempt to scanf within the interupt vector so I can not read in the values(character string) being sent.

Can anyone suggest a solution around this or an alternative way of implementing this in order to achive the same effect (i.e. character sting based protocol between devices).

kind Regards Michael