Christian,
I guess I successfully design the DS9097-equivalent circuit for serial
interface (no error showing "Could not detect DS9097").
Now, when I ran "owfs --foreground --error_level 9 /dev/ttyS0
/mnt/1wire/": it shows
---------------------
CONNECT: fuse mount point: /mnt/1wire/
CALL: PARSENAME path=[]
CONNECT: Cannot detect DS2480 or LINK interface on /dev/ttyS0.
DEBUG: COM_close: flush
DEBUG: COM_close: restore
DEBUG: COM_close: close
CALL: PARSENAME path=[]
DEBUG: fuse_mnt_opt=[(null)]
DEBUG: fuse_open_opt=[(null)]
unique: 1, opcode: INIT (26), nodeid: 0, insize: 56
INIT: 7.7
flags=0x00000003
max_readahead=0x00020000
INIT: 7.8
flags=0x00000001
max_readahead=0x00020000
max_write=0x00020000
unique: 1, error: 0 (Success), outsize: 40
---------------------
It seems owfs could not detect DS2781K sensor chip ("CONNECT: Cannot detect
DS2480 or LINK interface on /dev/ttyS0.") that I am using. So, even if
/dev/ttyS0 mounts successfully, I can not pull out any info, like voltage,
current, etc. from mounted directory.
Any suggestion will be helpful.
Thanks.
------
Christian Magnusson-2 wrote:
>
> The original schema looks like this.
>
> DTR ---------------------
>
> GND -------------------- schottky diods, resistance and zener diods.
>
> RXD ---------------------
>
> TXD ---------------------
>
>
>
> But if you are going to replace DTR with Vcc, I think you should add an
> extra resistance just after Vcc.
>
> Otherwise you might break your router if you short Vcc with GND. (+
> there
> will be some mA through the 3.9V zener which requires the resistance to
> avoid short-circuit).
>
> Vcc ----100ohm--------
>
> GND -------------------- + original schema..
>
> RXD ---------------------
>
> TXD ---------------------
>
>
>
> I don't think you wrote this in your reply. Does anyone else agree with
> this?
>
>
>
> /Christian
>
>
>
>
>
>
>
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of suman
> sarkar
> Sent: den 13 september 2007 02:28
> To: owfs-developers@lists.sourceforge.net
> Subject: [Owfs-developers] Re :Re: Re :Re: Re :Re: MIPS vs MIPSEL in OWFS
>
>
>
>
> OK, Christian ... first of all, thanks for your valuable input.
>
> If I understand it correctly, only 4 pins (2,3,4,5) of standard DB-9 are
> used to build an equivalent DS9097 circuit for 1-wire chips, of which DTR
> (pin 4) connects to 1-wire Data (probably DQ for Maxim 1-wire chip), and
> RXD
> (pin 2) connects to 1-wire GND (probably P- for Maxim 1-wire chip).
>
> So, with those diodes and resistors in the picture (protection circuit
> for
> the 1-wire chip), I've decided to build my own little circuit for 4-pin
> for
> my board (and not using off-the-shelf 9-pin DS9097).
>
> Conceptually it should work (help me if I am missing anything): DTR (of
> DB9) is equivalent to Vcc (my board), RX and TX (of DB9) are equivalent to
> TX and RX (my board), respectively, and GND to GND, of course with an
> equivalent protection circuit, as shown in the picture.
>
> With this (1-wire chip with my own circuit for 4-pin serial above, which
> I
> presume will be equivalent to DS9097), I guess owfs would be able to see
> and
> mount the /dev/ttyS0, and would NOT complain: "Could not detect DS9097".
>
> Any input from you will be useful before I jump into it.
>
> Another question: what about the other pins of DB9 as shown in the
> picture?
> Are they left open, especially handshaking pins like RTS/CTS (pin 7/8)?
>
> Thanks.
>
> ----
> On Wed, 12 Sep 2007 20:16:55 +0200 owfs-developers@lists.sourceforge.net
> wrote
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Shouldn't you be able to use Maxim's reference
>
> design of a passive 9097 adapter?
>
>
>
> DTR is there to supply 1-wire bus with power since it's
>
> high when serial-port is opened. This could be replaced with Vcc I think.
> Perhaps
>
> an extra 100ohm (just after Vcc) to protect it from short-circuit would
>
> be good too. The DTR pin is probably short-protected on all
> serial-interfaces,
>
> but Vcc on your board is probably not.
>
>
>
>
>
>
>
> Look at the drawing at:
>
>
>
> http://owfs.sourceforge.net/adapters.html#Serial
>
>
>
> Picture: http://owfs.sourceforge.net/adapters/adapter.gif
>
>
>
>
>
>
>
> /Christian
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> From:
>
> [EMAIL PROTECTED]
>
> [mailto:[EMAIL PROTECTED] On Behalf Of suman
>
> sarkar
>
>
>
> Sent: den 12 september 2007 01:59
>
>
>
> To: owfs-developers@lists.sourceforge.net
>
>
>
> Subject: [Owfs-developers] Re :Re: Re :Re: MIPS vs MIPSEL in OWFS
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Hi
>
> Christian,
>
>
>
>
>
>
>
> Here are some clarifications re: Meraki AP's serial interface.
>
>
>
>
>
>
>
> This interface is NOT a regular 9-pin interface (DB9) as you see in
>
> WRT54G. It has only 4 pins: Vcc, Tx, Rx, and GND.
>
>
>
>
>
>
>
> OWFS can only support DS9097 serial adapter, I presume, which has a
>
> regular 9-pin serial configuration.
>
>
>
>
>
>
>
> So, any Maxim sensor chip (which is DS2781K in our case), with DS9097
>
> serial adapter CAN NOT be directly fed to the AP's 4-pin interface. It
> needs
>
> some tweaking, I guess.
>
>
>
>
>
>
>
> Any suggestion regarding how to make it compatible with a 4-pin
>
> interface?
>
>
>
>
>
>
>
> Thanks.
>
>
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> <http://adworks.rediff.com/cgi-bin/AdWorks/click.cgi/www.rediff.com/signatur
> e-home.htm/[EMAIL PROTECTED]/1436607_1430041/1436126/1?PARTNER=3&OAS_QUERY=
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>
>
>
>
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