[CentOS] Adding an MT9234ZBA-USB modem to CentOS6.3

James B. Byrne byrnejb at harte-lyne.ca
Thu Oct 18 11:46:49 EDT 2012


On Wed, October 17, 2012 12:49, James B. Byrne wrote:
> How, exactly, does CentOS-6.3 with udev recognize an USB modem when it
> is plugged in.  How is it indicated?  What other configuration is
> required?

I now have the subject modem device attached to a kvm guest instance. 
I can connect to it from the guest using picocom.  I can see the TR
light go on.  I cannot find a baud rate with which to issue AT
commands.

If I use a baud rate of 38400, 57600 or 115200 and issue ATI then I
get back a variable number of unprintable (white question mark on
black background mostly) characters, with 115200 returning the longest
string.  If I use any rate below 38400 I see nothing.

# picocom -b 115200 /dev/ttyACM0
picocom v1.6

port is        : /dev/ttyACM0
flowcontrol    : none
baudrate is    : 115200
parity is      : none
databits are   : 8
escape is      : C-a
local echo is  : no
noinit is      : no
noreset is     : no
nolock is      : no
send_cmd is    : sz -vv
receive_cmd is : rz -vv
imap is        :
omap is        :
emap is        : crcrlf,delbs,

Terminal ready
����������֮͠����Թ��������� ������������������������썊������ҍ�

The same modem responded correctly to ATI commands issued in a 9600
baud picocom connection when the modem was attached to the host
system.

# picocom /dev/ttyACM0
picocom v1.6

port is        : /dev/ttyACM0
flowcontrol    : none
baudrate is    : 9600
parity is      : none
databits are   : 8
escape is      : C-a
local echo is  : no
noinit is      : no
noreset is     : no
nolock is      : no
send_cmd is    : sz -vv
receive_cmd is : rz -vv
imap is        :
omap is        :
emap is        : crcrlf,delbs,

Terminal ready
ATI
Agere OCM V.92 MT9234ZBA-USB Data/Fax Modem Version 1.02l

Does anyone have any idea what is happening and how to correct this?


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James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
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