I believe RS232 is active-low so you should see high volts on both Tx lines when not in use.
Not sure what you mean in #2, but everything is sent one bit at a time on the wire. I don't remember offhand if it starts with with the high or low bit of each byte. There will probably be some pause between bytes because registers need to get reloaded and stuff. Also, depending on the hdw protocol, there may be extra start/stop bits...I usually estimate 10 bits per byte. For #3, the sync byte is the 0x7E that TOS uses? That's 0111 1110 in binary. Plus any start/stops. Not sure, again, exactly what it looks like on a logic analyzer. Probably a close reading of some UART chip manual pages would be more informative than my comments above... MS [EMAIL PROTECTED] wrote:
Dear, I have a question regarding the communication protocol of the MIB 510 serial port. 1- For the UART of my PC, the voltage of the line (Tx, pin 3) is always high until a new packet comes in (start bit of 0), as shown in the attched diagram. Is it the same for the MIB 510, I mean when it is not sending data the voltage is high and it sends one 0 as a start bit of the packet? 2- When it is sending a packet (i.e 7E 42 7D ....) does it send it as a whole or byte per byte? 3- What is the binary (timing diagram) of the synchronization byte? Your help is much appreciated, Regards, Julia. _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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