Right, I have loaded OpenWrt (backfire, 2.6 kernel) onto my WRT54G and
modded it as per http://www.rwhitby.net/projects/wrt54gs to provide
serial ports and the DS9097U-009 has arrived.  I have checked in my PC
(via a USB to Serial adaptor) that the DS9097 works.

When I do
owfs --errorlevel=3 -d /dev/ttyS1 -m /root/1wire
I see
CONNECT: owfs.c:main(123) fuse mount point: /root/1wire
CONNECT: ow_avahi_link.c:OW_Load_avahi_library(72) No Avahi support.
Library libavahi-client couldn't be loaded
CONNECT: ow_dnssd.c:OW_Load_dnssd_library(136) Zeroconf/Bonjour is
disabled since dnssd library isn't found
   CALL: ow_parsename.c:FS_ParsedName_anywhere(90) path=[]
CONNECT: ow_com_read.c:COM_read(70) Timeout error (read) serial port: /dev/ttyS1
CONNECT: ow_com_read.c:COM_read(70) Timeout error (read) serial port: /dev/ttyS1
...

I don't know whether the first messages indicate a problem but it
appears that I am not able to talk to the DS9097.

The console serial port is working ok but I am not sure how to check
whether there may be a problem with the second port which is the one
the adaptor is plugged into.

One issue I am unsure about is what do do with DTR and RTS (these are
not present on the serial ports).  Looking at the data sheets for the
adaptor I have deduced that these are used to power the adaptor so
have connected a -6 volt supply to RTS and left DTR open.  Does anyone
know whether that should be ok?

Does anyone have any suggestions as to where to go now?  I have very
limited electronic facilities (no scope, only a DVM).

Colin

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