Long,
In general, the serial port should be able to provide that sort of
datarate easily. If i remember correctly the telosB motes use 115200
baud for the serial communication. This means that you can send up to
115,200 bits/second through the serial. The data rate that you are
wanting to send is 40 * 20 * 8 = 6400 bits/second (not including
headers, etc). This shouldn't stress the serial port or the
radio(assuming that there isn't too much interference on the channel you
are using). You might want to look at how many packets/sec you see at
each step (PC to mote, mote to mote, mote to PC). It most likely is not
because of the serial, but because you are not generating enough
packets, or for some reason you are processing packets way too slowly in
your implementation.
Hope this helps.
-Paul
Le Thanh Long wrote:
Hi All,
I want to communicate between 2 PCs using Zigbee on Telosb.
In my application, I want to send 40 packets/second, the packet size
is around 20 bytes but my program can send only around 5 packets/seconds.
My program is similar to TestSerial in tutorial
http://docs.tinyos.net/index.php/Mote-PC_serial_communication_and_SerialForwarder
. The program will write to serial port and BaseStation running in
telosb will forward it to another Telosb.
I wonder what is the reason behind the slow transmission. I guess that
is because of bottle neck of serial port.
Can you give some hints to achieve higher data rate?
Thank you and best regards,
Long
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