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?