the LinkUSB is a serial over USB adapter: can you rule out USB problems?
I have a LinkUSB connected to a very old server running Linux and sometimes the
device gets "disconnected":
[ 1.808165] usb 1-5.2: new full-speed USB device number 4 using ehci_hcd
[ 1.906558] usb 1-5.2: New USB device found, idVendor=0403, idProduct=6001
[ 1.906563] usb 1-5.2: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[ 1.906566] usb 1-5.2: Product: FT232R USB UART
[ 1.906569] usb 1-5.2: Manufacturer: FTDI
[ 1.906572] usb 1-5.2: SerialNumber: XXXXXXXX
[ 6.601905] usb 1-5.2: Detected FT232RL
[ 6.601908] usb 1-5.2: Number of endpoints 2
[ 6.601912] usb 1-5.2: Endpoint 1 MaxPacketSize 64
[ 6.601915] usb 1-5.2: Endpoint 2 MaxPacketSize 64
[ 6.601918] usb 1-5.2: Setting MaxPacketSize 64
[ 6.602420] usb 1-5.2: FTDI USB Serial Device converter now attached to
ttyUSB0
...
[529298.815921] usb 1-5.2: USB disconnect, device number 4
[529299.340167] usb 1-5.2: new full-speed USB device number 5 using ehci_hcd
[529299.438420] usb 1-5.2: New USB device found, idVendor=0403, idProduct=6001
[529299.438425] usb 1-5.2: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[529299.438429] usb 1-5.2: Product: FT232R USB UART
[529299.438432] usb 1-5.2: Manufacturer: FTDI
[529299.438435] usb 1-5.2: SerialNumber: XXXXXXXX
[529299.441024] usb 1-5.2: Detected FT232RL
[529299.441027] usb 1-5.2: Number of endpoints 2
[529299.441030] usb 1-5.2: Endpoint 1 MaxPacketSize 64
[529299.441034] usb 1-5.2: Endpoint 2 MaxPacketSize 64
[529299.441036] usb 1-5.2: Setting MaxPacketSize 64
[529299.441403] usb 1-5.2: FTDI USB Serial Device converter now attached to
ttyUSB1
...
[1016813.881513] usb 1-5.2: USB disconnect, device number 5
[1016814.412250] usb 1-5.2: new full-speed USB device number 6 using ehci_hcd
[1016814.510375] usb 1-5.2: New USB device found, idVendor=0403, idProduct=6001
[1016814.510380] usb 1-5.2: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[1016814.510384] usb 1-5.2: Product: FT232R USB UART
[1016814.510387] usb 1-5.2: Manufacturer: FTDI
[1016814.510390] usb 1-5.2: SerialNumber: XXXXXXXX
[1016814.513109] usb 1-5.2: Detected FT232RL
[1016814.513113] usb 1-5.2: Number of endpoints 2
[1016814.513116] usb 1-5.2: Endpoint 1 MaxPacketSize 64
[1016814.513120] usb 1-5.2: Endpoint 2 MaxPacketSize 64
[1016814.513123] usb 1-5.2: Setting MaxPacketSize 64
[1016814.513478] usb 1-5.2: FTDI USB Serial Device converter now attached to
ttyUSB0
So here you see that once a week or so my linkUSB is disconnected and
"rediscovered", which means that I have the linkUSB bouncing between
/dev/ttyUSB0 and /dev/ttyUSB1. I have no idea who is responsible of this
behaviour (the server USB adapter? the linkUSB? the Linux kernel?)
I solved the problem with a custom udev rule, which creates a /dev/linkUSB0
symlink to the current /dev/ttyUSBx device.
SUBSYSTEM=="tty", \
ATTRS{product}=="FT232R USB UART", ATTRS{serial}=="XXXXXXXX", \
SYMLINK+="linkUSB0", GROUP="owfs"
where of course you have to substitute XXXXXXXX with the actual serial number.
BTW I also set the group to "owfs" instead of "dialout" since I do not run
owserver as root but as a user belonging to the group, you guess, "owfs".
S.
On 05 Jun 2014, at 13:52, Johan Ström <jo...@stromnet.se> wrote:
> Hi,
>
> I got a LinkUSB as a master for my 1-wire net, around 80m with 30 devices.
> The bus is scanned every minute and temperature sensors polled (most of
> the devices). Around 3 times a second I try to scan the alarm dir for
> alarms (DS2406's), and possibly handle these.
>
> Normally this works perfectly fine, and has done so for a few years. No
> re-reads or CRC errors according to the counters.
> However, a few times during these years, the whole network has become
> inaccessible, and the only way to get it back into working shape has
> been to unplug the LinkUSB from both the 1w-network (DQ+DGND), and the
> USB port.
> Once doing this, it all comes back up immediately, and all devices work
> fine.
>
> If I recall correct I have also pulled the external 5V feed to the
> devices too, but just disconnecting the 1w-network from the LinkUSB, and
> disconnecting the 5V feed has NOT been enough, the USB port must be
> disconnected as well. Restart of owserver does not help.
>
>
> Anyone else with similar experiences, or ideas on what might be causing
> this or how to work around it? Hard to debug since I cannot really
> reproduce it at will..
>
> Thanks
> Johan
>
> ------------------------------------------------------------------------------
> Learn Graph Databases - Download FREE O'Reilly Book
> "Graph Databases" is the definitive new guide to graph databases and their
> applications. Written by three acclaimed leaders in the field,
> this first edition is now available. Download your free book today!
> http://p.sf.net/sfu/NeoTech
> _______________________________________________
> Owfs-developers mailing list
> Owfs-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/owfs-developers
------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and their
applications. Written by three acclaimed leaders in the field,
this first edition is now available. Download your free book today!
http://p.sf.net/sfu/NeoTech
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
