Hi,
thanks for your reply,
I tryed to do what you suggest me, i used the function "Visa Configure Serial Port", to configure the baud rate, the bit parity, etc...
I configure my two serial ports with MAX, and check their good behaving with a hyperterminal, and it's work.
But, when i connect this two ports with a cable (with Tx1 on Rx2 and Tx2 on RX1), and when i run my vi, i still have the VISA error BFFF0015, which is the time out error.
i don't know what doing more...
thanks for help me another time.
regards