I wrote RS232 TX and RX soft. It's working, but I had like one device to send a message to another one, that will respond to the message. Anybody did that kind of thing? -- _____________ \ / David BALDWIN \ ALCATEL / Design engineer \TELECOM/ \ / SdM (Societe de Microelectronique) \ / \ / B.P. 4205 Phone : +32 (0)71 442932 V B-6000 Charleroi Fax : +32 (0)71 442905 (Belgium) mailto:baldwin@etca.alcatel.be