--- In [email protected], "guellep" <[EMAIL PROTECTED]> wrote: > > > I still get no result but maybe there is a hardware > > problem as the program complains about shorted 1-wire bus. I will > > try another DS2480B chip to see if there is no misunderstanding > > because of faulty or wrongly soldered chips. > > Did you take care of pin6 (polarity) of the DS2480B? > It makes a difference whether the DS2480B is connected directly > to the UART pin or to a RS232 level shifter (which also inverts > the polarity of the logic signal). > > The data sheet says: "pin 6 must be tied to VDD for direct UART > connection". > > I use an original Dallas/Maxim DS9097U serial to 1-wire Adapter > (with 9-pin D connector) which contains the DS2480B. Connecting the > adapter to /dev/ttyS3 on the Fox socket board works fine with the > test programms provided by the Dallas 1-wire SDK (e. g. tstfind). > > The levels provided by the RS23 level shifter on the socket board > are 5 V, so the DS9097U can operate within specs. The DS2480B > requires a supply voltage of 5 V, which is drawn from the RTS/CTS > lines of the RS232 interface. > > BTW, this is my first contribution to this group, so I would like > to say hallo to all the group members and thank you for the many > interesting contributions. > > Regards > > Klaus >
Hallo I know about this pin and have fixed it as in the docs. I do have communication with the chip but get some unexpected result codes. I have also used a tstfind program from the Public Domain code. This little does not always report the devices on the 1-wire. I would say about 50% of the time I get nothing found. So I think the comms are OK and the chip is wired correctly, I still want to try another chip and maybe your suggestion. Thanks for your input Jos
