PaulS:
so i now i only know how to begin a baud rate, how about the port?
I don't understand the question, I guess. A PC can have multiple devices connected to it, and each connection creates a new real or virtual COM port. The code running on the PC needs to connect, then, to the correct port.
The Arduino has only one real, and no virtual, serial port. So, there is no need to "define the port". It simply is.
i think i get what your mean, is that mean the arduino has only one real port. so we have no need to define the port? Lets say in the PC, when i am connected to the board by USB, i need to set the baud rate and port number in the serial terminal so that i can see the data on the board. Instead of PC, i am connecting arduino Uno to the board. So I just wondering how i going to access the board. For example in pc:
I type R 32 to read the register value follow by guide in:
http://www.sparkfun.com/datasheets/Sensors/Accelerometer/ADXLEvalBoard%20User_Guide2009-09-14.pdf in page 4.
In another way, i connect arduino UNO to the eval board. How i going to program the code so that arduino will keep requesting data from the eval board??
thanks for consider my question. Thanks again