Digi Watchport/T temperature sensor as /dev/ttyU
O. Hartmann
ohartman at zedat.fu-berlin.de
Fri Jul 22 16:35:42 UTC 2016
For temperature monitoring, we have a bunch of Digi Watchport/T sensors:
http://ftp1.digi.com/support/documentation/90000406_H.pdf
They work well with CentOS 5/6 systems and there is also a Nagios plugin, written in
Perl, which makes those sensors usable with Nagios/Icinga/Icinga2:
https://exchange.nagios.org/directory/Plugins/System-Metrics/Environmental/check_watchptTemp/details
When attached to FreeBSD 12-CURRENT, the sensor is seen as a generic USB device, for
instance
ugen2.7: <WatchportT Digi International> at usbus2, cfg=0 md=HOST spd=FULL (12Mbps)
pwr=ON (80mA)
I tried to load any available USB serial port/adaptor driver available to make this
sensor attach as a ttyU? as it does in Linux (/dev/ttyUSB), but no luck so far. I'm not
familiar with serial consoles or the derial capabilities of FreeBSD, so i might have
overseen something essential. I'd like to access the sensor to retrieve temperature data,
even if it is in a crude way. Poking around with USB, I found that the sensor device does
release some informations, so hopefully there is a way to make it look like a tty, see my
attempts to get some informations out of the device below.
If someone has some help, hints or advice, I'd appreciate an email (please CC me, I do
not subscribe the QUESTION list).
Thanks in advance,
Oliver
# usbconfig -u 2 -a 7 dump_device_desc
ugen2.7: <WatchportT Digi International> at usbus2, cfg=0 md=HOST spd=FULL (12Mbps)
pwr=ON (80mA)
bLength = 0x0012
bDescriptorType = 0x0001
bcdUSB = 0x0110
bDeviceClass = 0x00ff <Vendor specific>
bDeviceSubClass = 0x0000
bDeviceProtocol = 0x00ff
bMaxPacketSize0 = 0x0008
idVendor = 0x1608
idProduct = 0x0304
bcdDevice = 0x0100
iManufacturer = 0x0001 <Digi International>
iProduct = 0x0002 <Watchport/T>
iSerialNumber = 0x0003 <W82765150-0>
bNumConfigurations = 0x0001
# usbconfig -u 2 -a 7 dump_all_config_desc
ugen2.7: <WatchportT Digi International> at usbus2, cfg=0 md=HOST spd=FULL (12Mbps)
pwr=ON (80mA)
Configuration index 0
bLength = 0x0009
bDescriptorType = 0x0002
wTotalLength = 0x0027
bNumInterfaces = 0x0001
bConfigurationValue = 0x0001
iConfiguration = 0x0000 <no string>
bmAttributes = 0x00a0
bMaxPower = 0x0028
Interface 0
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0000
bAlternateSetting = 0x0000
bNumEndpoints = 0x0003
bInterfaceClass = 0x00ff <Vendor specific>
bInterfaceSubClass = 0x0000
bInterfaceProtocol = 0x00ff
iInterface = 0x0000 <no string>
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0081 <IN>
bmAttributes = 0x0002 <BULK>
wMaxPacketSize = 0x0040
bInterval = 0x0000
bRefresh = 0x0000
bSynchAddress = 0x0000
Endpoint 1
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0001 <OUT>
bmAttributes = 0x0002 <BULK>
wMaxPacketSize = 0x0040
bInterval = 0x0000
bRefresh = 0x0000
bSynchAddress = 0x0000
Endpoint 2
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0087 <IN>
bmAttributes = 0x0003 <INTERRUPT>
wMaxPacketSize = 0x0008
bInterval = 0x0001
bRefresh = 0x0000
bSynchAddress = 0x0000
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