01-08-2020
Does the ethernet to serial adapter have a brand name on it? Often these devices are oem'd from a third party that manufactures the adapters. Also, they are often configured on the LAN using a browser. If you know the ip address of the adapter have you tried putting that address into a browser to see if you get invited to configure the thing?
To answer your first question, yes, it is certainly possible to access a serial device over ethernet using an adapter.
e.g.
NETRS232485 | Startech RS232 to Ethernet Ethernet Adapter | RS Components
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EX(4) BSD/i386 Kernel Interfaces Manual EX(4)
NAME
ex -- Ethernet device driver for the Intel EtherExpress Pro/10 and Pro/10+
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file:
device ex
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_ex_load="YES"
DESCRIPTION
The ex driver provides support for Ethernet adapters based on the Intel i82595 chip.
On the ISA bus, the card will be searched for in the I/O address range 0x200 - 0x3a0. The IRQ will be read from the EEPROM on the card. For
correct operation Plug-N-Play support should be disabled.
On the PC Card bus, the card will be automatically recognized and configured.
HARDWARE
The ex driver supports the following Ethernet adapters:
o Intel EtherExpress Pro/10 ISA
o Intel EtherExpress Pro/10+ ISA
o Olicom OC2220 Ethernet PC Card
o Olicom OC2232 Ethernet/Modem PC Card
o Silicom Ethernet LAN PC Card
o Silicom EtherSerial LAN PC Card
DIAGNOSTICS
ex%d: Intel EtherExpress Pro/10, address %6D, connector %s The device probe found an installed card, and was able to correctly install the
device driver.
ex%d: WARNING: board's EEPROM is configured for IRQ %d, using %d The device probe detected that the board is configured for a different
interrupt than the one specified in the kernel configuration file.
ex%d: invalid IRQ. The device probe detected an invalid IRQ setting.
SEE ALSO
arp(4), netintro(4), ng_ether(4), ifconfig(8)
HISTORY
The ex device driver first appeared in FreeBSD 2.2.
AUTHORS
The ex device driver was written by Javier Martin Rueda. The PC Card attachment was written by Mitsuru ISAWAKI and Warner Losh. This manual
page was written by David E. O'Brien.
BUGS
Currently the driver does not support multicast.
The Silicom EtherSerial card's serial port does not currently work. The Olicom OC2232 PC Card should work with the ex driver, but is cur-
rently completely broken.
BSD
July 16, 2005 BSD