I just post the message again as it is displayed as attachment in the mailing list. Hope it gets represented accurately without the attachment of the PDF containing the schematic. The previous posting has the schematic of my dS2480B design attached....
>This is one of the difficult cases of 'it works for me, but not you.' >I just tested an authentic DS9097U >I guess the first question is do you have other proof that your adapter >functions correctly? I don't of course :-) I setup 2 of the identical PCBs. Both of them do not work. One of them I checked with an oscilloscope. 1) The TX signal from the RS232 is correctly transfered to the DS2480B.The DS2480B is not answering however. 2) Then I played with the polarity pin. Tying POL to high changes the output voltage of on RX on the DS2480B, but still does not yield a response. 3) I never observed any activity on the 1 wire bus. I came up with the following scenarios: 1) There is an systematic error in the circuitry. Hence both of them do not work 2) The DS2480B of both PCBs is broken 3) The DS2480B of the PCB I scrutenized with the oscilloscope is broken. The other PCB has a fabrication issue (like a soldering joint not producing an electrical contact) 4) OWFS might have an issue with DS2480B. 5) Supply voltage insufficient (5) The measured supply voltage is close to 5 V. That should be fine. (4) I understand that the DS9097U uses the DS2480B, and works fine with OWFS. (2) This I find unlikely (3) I lost my probes for the oscilloscope. Hence I can currently not validate (3) and measure the signals on the second PCB as well. (1) This is the most likely scenario. There is however Michael's circuit a) Michael has a similar circuit to mine and the DS9097U b) Michael receives the same error messages from OWFS c) Looking at the data sheet of DS2480B, I do not find any mistakes in the circuitry -- neither in Michael's nor in mine. I attached it -- please have a look yourself. Thanks Tilman _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
