On Jan 28, 2014, at 16:46 09, Ryan Williams <[email protected]> wrote:
> I am using the latest appliance, so CentOS 6.4 with Rivendell 2.5.5 (also
> tried with 2.7.1) running on an Intel DH87MC motherboard. The motherboard has
> no on-board serial ports, so I bought a Rosewill RC-301 PCI serial card. The
> card supposedly supports Linux, but their instructions seem incomplete and I
> could never get the switcher to budge even trying /dev/ttyS0 through
> /dev/ttyS3 with proper settings for the 8.2.
First, run the following command:
dmesg | grep tty
That should give you a list of all the ‘basic’ serial cards that the kernel
knows about (‘basic’ here meaning serial devices that use the standard 65x50
UART driver).
Next, get hold of an RS-232 loopback plug. Many of the higher-end serial cards
come with one; if yours didn’t, you can make one pretty easily by taking a DB9F
connector and connecting pins 2 and 3 together.
Now, install your favorite serial terminal program (‘minicom’ is the one I
always use). Set it to full duplex, disable hardware handshaking and configure
it to look at the first serial device in the list from dmesg. Plug the
loopback plug into each serial port in turn and type a few characters. If you
see nothing in the serial terminal, move the loopback plug to the next port and
repeat. When you see characters after typing, you’ve found the physical port
that corresponds to the device you’ve set the serial terminal to look at.
Label it accordingly. Repeat the process for each device listed by dmesg.
Only now, when you’ve established what corresponds to what and that the serial
hardware actually works, should you bring Rivendell into the equation.
If you’re using a high-end board with more than four ports or ‘accelerated’
hardware, then you may need to pass the kernel some magic parameters at boot
time. We’ll save that one for the 200-level course.
1970s technology — such fun...
Cheers!
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