Yes, I have tried what you described and now it works like a charm. I maybe a software freak as I do not really understand this.
But since this works, I can at last continue with my master plan!! Now I am going to the next step, using a Lantronix Xport to remote read 1-wire. My problem is that our house is quite old and nobody foreseen to build cable ducts when building the house (20 years old). I have managed to lay ethernet between the floors, but major building work if I want more cabling. My idea is to use XPorts to manage the serial comms from a central FOX board. I have found a software on the net that offer a serial interface to owfs software, translate this into ethernet which can then be give to the DS2480B chip on the other side. Anybody have experience with something like this ? Jos --- In [email protected], "guellep" <[EMAIL PROTECTED]> wrote: > > Because I also intend to use /dev/ttyS2 for 1-wire communication > I did some additional testing with the DS2480B. > > This is my setup: > > - Direct connection of the DS2480B's TXD and RXD pins to > ttyS2 TX and RX lines (on J6 of Fox board). > > - POL pin of DS2480B tied to GND > > - Some 1-wire devices connected to 1-wire output of DS2480B. > > I wanted to know whethter the 3.3V logic of the Fox board > could directly interface with the 5V logic of the DS2480B > (according to the data sheet the DS2480B is intended for > use with 5V UARTS). > > Here are my results: > > 1. Supplying the DS2480B from an external voltage source < 4.5 V > the tstfind application finds all connected 1-wire devices. > > 2. Supplying the DS2480B with 5.0V provided from J6, > no devices are found. > > 3. Inserting a 1N4148 diode from 5.0 V to VDD of the DS2480B > all devices are found. > > Conclusion: > > With a slightly reduced supply voltage (voltage drop across the diode) > the logic threshold of the DS2480B seems to be > compatible with the 3.3V logic of the board UART, interfacing of the > DS2480B to the Fox board just requires an additional standard silicon > diode. > > I would not suggest this setup for critical volume applications > where reliability is of concern (supply voltage of the DS2480B > slightly out of specs), but it works fine for simple > workbench testing. > > Regards > > Klaus >
