Of course... but I just thought that it was more likely that suman had a max3232 at home, compared to a ds2450 :) The problem should be the signal level in this case.
The original drawing at http://owfs.sourceforge.net/adapters.html#Serial requires that you connect the components to a RS232 serial interface (with -15 to 15 Volt). If you are going to connect the 1-wire devices to some TTL levels, then you can find some reference designs at http://pdfserv.maxim-ic.com/en/an/app132.pdf . They don't describe how to connect to a serial TTL port, since they recommend you to use a DS2450B chip. This is to control the slewrate and provide clean signals on the 1-wire bus. Connecting TX to the 1-wire data provide any good signal, and it differs from TTL interface to TTL interface. If you have _very_ small 1-wire network, you might be able to talk to the devices with just 2 resistors if you are lucky. It really depends on how the TX-signal behaves on your serial TTL interface. I can't guarantee that it works for you, but you might try this simple design. +5V-------------+ | 2200ohm | RX(TTL)---------+---------------------- 1-wire data | TX(TTL)--100ohm-+ GND ----------------------------------- 1-wire ground All other people should ignore this schema... It's not recommended to use it. Buy real 1-wire adapter and connect it to a rs232 interface or USB interface instead.... /Christian > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:owfs- > [EMAIL PROTECTED] On Behalf Of njh > Sent: den 15 september 2007 17:02 > To: owfs-developers@lists.sourceforge.net > Subject: Re: [Owfs-developers] MIPS vs MIPSEL in OWFS > > On Sat, 15 Sep 2007, Christian Magnusson wrote: > > > BTW: isn't your serial interface in TTL levels? Then you have to get > a > > converter, such as MAX3232 > > However, the Max232 uses a fair amount of power to drive the charge > pumps, > which you would then just be throwing away. > > If you just used a DS2480 directly you can connect to TTL level signals > avoiding two max232 type level shifters. The DS2480 has a polarity > select > pin which allows you to ensure the phase is correct. > > http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2923 > > njh > > ----------------------------------------------------------------------- > -- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
