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>
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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