Hi,
I have a RS-232 external dial-up modem that I use from time to time. It works
fine when connected through a RS-232 port. I'd like to use the modem with
another PC that doesn't have a RS-232 port, so I bought a RS-232 to USB adapter
cable. It's a simple inexpensive cable that doesn't seem to have any
chips/processors in it.
Now, when I connect the modem through a USB port I can't get the modem to work.
It doesn't even attempt to dial the number:
# uname -a
Linux testbox 2.6.26-2-686 #1 SMP Mon Jun 21 05:58:44 UTC 2010 i686 GNU/Linux
# cat /var/log/syslog
....
Sep 17 02:44:12 testbox kernel: [363413.804010] usb 1-9: new full speed USB
device using ohci_hcd and address 2
Sep 17 02:44:12 testbox kernel: [363414.008001] usb 1-9: configuration #1
chosen from 1 choice
Sep 17 02:44:12 testbox kernel: [363414.017176] usb 1-9: New USB device found,
idVendor=1a86, idProduct=7523
Sep 17 02:44:12 testbox kernel: [363414.017181] usb 1-9: New USB device
strings: Mfr=0, Product=2, SerialNumber=0
Sep 17 02:44:12 testbox kernel: [363414.017185] usb 1-9: Product: USB2.0-Serial
Sep 17 02:44:12 testbox kernel: [363414.133413] usbcore: registered new
interface driver usbserial
Sep 17 02:44:12 testbox kernel: [363414.133431] usbserial: USB Serial support
registered for generic
Sep 17 02:44:12 testbox kernel: [363414.133454] usbcore: registered new
interface driver usbserial_generic
Sep 17 02:44:12 testbox kernel: [363414.133457] usbserial: USB Serial Driver
core
Sep 17 02:44:12 testbox kernel: [363414.152941] usbserial: USB Serial support
registered for ch341-uart
Sep 17 02:44:12 testbox kernel: [363414.152941] ch341 1-9:1.0: ch341-uart
converter detected
Sep 17 02:44:12 testbox kernel: [363414.188064] usb 1-9: ch341-uart converter
now attached to ttyUSB0
Sep 17 02:44:12 testbox kernel: [363414.188086] usbcore: registered new
interface driver ch341
Sep 17 02:44:54 testbox pppd[32601]: pppd 2.4.4 started by luser, uid 2000
Sep 17 02:44:55 testbox chat[32602]: abort on (BUSY)
Sep 17 02:44:55 testbox chat[32602]: abort on (NO CARRIER)
Sep 17 02:44:55 testbox chat[32602]: abort on (VOICE)
Sep 17 02:44:55 testbox chat[32602]: abort on (NO DIALTONE)
Sep 17 02:44:55 testbox chat[32602]: send (ATZW2^M)
Sep 17 02:44:55 testbox chat[32602]: expect (OK)
Sep 17 02:45:00 testbox chat[32602]: SIGTERM
Sep 17 02:45:00 testbox pppd[32601]: Connect script failed
Sep 17 02:45:02 testbox pppd[32601]: tcsetattr: Interrupted system call (line
1010)
Sep 17 02:45:03 testbox pppd[32601]: Exit.
Sep 17 02:45:10 testbox pppd[32625]: pppd 2.4.4 started by luser, uid 2000
Sep 17 02:45:11 testbox chat[32626]: abort on (BUSY)
Sep 17 02:45:11 testbox chat[32626]: abort on (NO CARRIER)
Sep 17 02:45:11 testbox chat[32626]: abort on (VOICE)
Sep 17 02:45:11 testbox chat[32626]: abort on (NO DIALTONE)
Sep 17 02:45:11 testbox chat[32626]: send (ATZW2^M)
Sep 17 02:45:11 testbox chat[32626]: expect (OK)
Sep 17 02:45:56 testbox chat[32626]: alarm
Sep 17 02:45:56 testbox chat[32626]: Failed
Sep 17 02:45:56 testbox pppd[32625]: Connect script failed
Sep 17 02:46:36 testbox pppd[32625]: tcsetattr: Interrupted system call (line
1010)
Sep 17 02:46:37 testbox pppd[32625]: Exit.
Sep 17 02:46:42 testbox pppd[32647]: pppd 2.4.4 started by luser, uid 2000
Sep 17 02:46:43 testbox chat[32648]: abort on (BUSY)
Sep 17 02:46:43 testbox chat[32648]: abort on (NO CARRIER)
Sep 17 02:46:43 testbox chat[32648]: abort on (VOICE)
Sep 17 02:46:43 testbox chat[32648]: abort on (NO DIALTONE)
Sep 17 02:46:43 testbox chat[32648]: send (ATZW2^M)
Sep 17 02:46:43 testbox chat[32648]: expect (OK)
Sep 17 02:47:11 testbox chat[32648]: SIGTERM
Sep 17 02:47:11 testbox pppd[32647]: Connect script failed
Sep 17 02:47:12 testbox pppd[32647]: tcsetattr: Interrupted system call (line
1010)
Sep 17 02:47:13 testbox pppd[32647]: Exit.
Any ideas? Thanks
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