05-28-2014
The lack of feedback on your topics, and your fixation on turning eth0 into a ttyUSB device, gives the impression you're still fighting the same problem.
USB ethernet adaptors are nothing less than an external network "card". It will act just like your other ethernet devices. It will not make a TTY device. How could it? It's not going to have the correct port for your data logger built into the hardware.
There may be a raw USB device to read, but its data won't make much sense to you unless you spend some years studying USB protocol and reverse-engineering your USB network card's driver.
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LEARN ABOUT FREEBSD
if_mos
MOS(4) BSD Kernel Interfaces Manual MOS(4)
NAME
mos -- Moschip MCS7730/MCS7830/MCS7832 USB Ethernet driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device uhci
device ohci
device ehci
device usb
device miibus
device mos
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_mos_load="YES"
DESCRIPTION
The mos driver provides support for USB Ethernet adapters based on the Moschip MCS7730/MCS7830/MCS7832 chipset.
The adapters that contain the Moschip MCS7730/MCS7830/MCS7832 chipset will operate at 100Base-TX and full-duplex.
The Moschip contains a 10/100 Ethernet MAC with MII interface and is designed to work with both Ethernet and HomePNA transceivers. Although
designed to interface with 100Mbps peripherals, this only works with USB 2.0. The existing USB 1.0 standard specifies a maximum transfer
speed of 12Mbps. USB 1.0 Users should therefore not expect to actually achieve 100Mbps speeds with these devices.
The Moschip supports a 64-bit multicast hash table, single perfect filter entry for the station address and promiscuous mode. Packets are
received and transmitted over separate USB bulk transfer endpoints.
For more information on configuring this device, see ifconfig(8).
HARDWARE
Adapters supported by the mos driver include:
o Sitecom LN030
SEE ALSO
altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), ifconfig(8)
ADMtek AN986 data sheet, http://www.moschip.com/data/products/MCS7830/Data%20Sheet_7830.pdf.
HISTORY
The mos device driver first appeared in FreeBSD 8.2.
AUTHORS
The mos driver was written by Rick van der Zwet info@rickvanderzwet.nl.
BSD
February 14, 2011 BSD