[BRLTTY] usb to serial problems

[Daniel Dalton]

On Sat, 26 Apr 2008, Jason White wrote:

>> What log should I grep? I'm not very familiar with the logs yet...
>> I just grepped every file in /var/log/ which was probably quite stupid
>> since the output had 3000 lines...
>> (searching for the words brltty) (ignoring case)
>
> grep brltty /var/log/syslog | tail
> to start with. Use tail to show only the most recent log entries.

OK, here is what I get. I have just pasted the whole screen in case it may 
be helpful:

daniel at debian-compaq:~$ sudo grep -n -i 'brltty' /var/log/syslog | tail 
992:Apr 26 17:35:56 debian-compaq brltty[4773]: serial write error 19: No 
such device. 993:Apr 26 17:35:57 debian-compaq brltty[4773]: 
SpeechDispatcher Speech Driver: 994:Apr 26 17:36:02 debian-compaq 
brltty[4773]: Write error 19: No such device. 995:Apr 26 17:36:02 
debian-compaq brltty[4773]: serial write error 19: No such device. 996:Apr 
26 17:36:08 debian-compaq brltty[4773]: Write error 19: No such device. 
997:Apr 26 17:36:08 debian-compaq brltty[4773]: serial write error 19: No 
such device. 998:Apr 26 17:36:13 debian-compaq brltty[4773]: Write error 
19: No such device. 999:Apr 26 17:36:13 debian-compaq brltty[4773]: serial 
write error 19: No such device. 1000:Apr 26 17:36:19 debian-compaq 
brltty[4773]: Write error 19: No such device.1001:Apr 26 17:36:19 
debian-compaq brltty[4773]: serial write error 19: No such device. 
daniel at debian-compaq:~$

Any ideas?
Dmesg says it is on ttyUSB1.
I also tried the following:
brltty -b bn -d ttyUSB0
brltty -b bn -d ttyUSB1

(Like before)

Any ideas on what could be the problem?
Or should I return my cable?

>>
>> I can, however, when the cable is removed ttyUSB1 does not exist, but
>> ttyUSB0 does. When I plug in the cable ttyUSB0 and ttyUSB1 both exist.
>> Do you know why this could be?
>> I have a serial port pluged in and some other cables, but nothing usb...
>
> The only reason why /dev/ttyUSB0 would exist as well is that there is another
> USB to serial converter installed. Is the other serial port built into the
> machine, or is it part of the cable that you have plugged in?

There are two serial ports built in to this compaq... Unfortunately, my hp 
isn't available for testing yet.
But I thought they would be ttyS0 and 1?
Also it has two usb ports and only one is pluged in with the usb to serial 
cable...
So I'm not sure actually.

>
> If you run lsusb it should list all of the USB devices connected to your
> system, from which you can tell what USB to serial converters are attached.

Bus 001 Device 019: ID 4348:5523 Bus 001 Device 001: ID 0000:0000

That's what I see.

Thanks for all your help!

Cheers,

-- 
Daniel Dalton

http://members.iinet.net.au/~ddalton/
<d.dalton at iinet.net.au>