The telosb doesn't use a "real" serial port, it's USB. I'm not clear if a baud rate is relevant, although it appears that the USB serial comm emulation drivers have a setting for such.
In any case, I once did measurements with the micaz using a USB->serial adapter cable and got around 200 normal sized messages per second. Since the telosb uses the same radio chip and a cleaner host connection scheme I would guess that it should match or exceed that. Is there any chance of radio interference which would cause the MAC to backoff or drop lots of messages? MS Paul Johnson wrote: > 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 >> >> >> ------------------------------------------------------------------------ >> New Email names for you! >> <http://sg.rd.yahoo.com/sg/mail/domainchoice/mail/signature/*http://mail.promotions.yahoo.com/newdomains/sg/> >> >> >> Get the Email name you've always wanted on the new @ymail and @rocketmail. >> Hurry before someone else does! >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> Tinyos-help mailing list >> [email protected] >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > ------------------------------------------------------------------------ > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
