usb serial programming

[Amadeus W.M.]

> 
> What is the:
> 	Bus 004 Device 008: ID 0764:0501 Cyber Power System, Inc. CP1500 AVR UPS
> 
> device?

That's my backup power supply. 


> 
>> Should /dev/ttyUSB0 pop up when I plug the adapter into the usb port,
>> even before I connect anything to the serial port of the cable? 
> 
> Yes.
> 
> What happens in the kernel log when you plug the device into the system?
> 
> Try doing:
> 	dmesg -c
> 	# plug in the adapter now
> 	dmesg
> to just see the log messages for that, and not the whole kernel boot
> log.
> 
2) root:~> dmesg -c   #plug-in adapter
3) root:~> dmesg 

Absolutely nothing. I also did

tail -f /var/log/messages

then plugged in the adapter, and again, everything seems dead. The USB port
is ok, because other devices (e.g. the Fushicai video grabber) do work.


>> If the adapter is not supported, can I write a driver for it? I'll be happy to,
>> with a little guidance to get me started. Any pointers?
> 
> Odds are the device id just needs to be added to an existing driver as
> I do not know of any "new" usb-serial converter chips that Linux does
> not already support.
> 

Oh, one more thing. Reading about these converters, I saw many use an 
ftdi chip, so I did modprobed ftdi_elan and ftdi_sio:

7) root:~> lsmod | grep ftdi
ftdi_elan              36689  0 
ftdi_sio               48770  0 

In fact, the dmesg above was with the ftdi modules loaded.