USB-Serial ??

Loren M. Lang lorenl at
Tue Jun 20 05:17:55 UTC 2006

fbsd wrote:
> Sorry dud but what you have is a winmodem.

No, it's a USB modem, winmodems are a type of PCI modem.

> XP has special driver for that external modem to work.
> It is not supported in FreeBSD as far as I have seen.
> There is no such thing as USB-serial modem.

There is, I've used one.  While I can't gaurntee it will work, check out
the umodem driver.  Just load the driver with 'kldload umodem' and see
if it detects anything.  dmesg is a handy command for such things.
There are also some other possibilities, check out
under USB.  The device probably will be something like /dev/ucom0, but
check the output of dmesg.

> External modem is connected to motherboard by serial cable or USB
> cable.
> Serial external modem works right out of the box and USB external
> modem are all winmodems.

Any serial modem should work fine for FreeBSD using either the hardware
serial ports on your motherboard with the sio driver or possibly some
USB serial adapters that are supported.  USB modems are not winmodems,
but they still sometimes require a special driver that FreeBSD does not

> There is a port ltmdm which works for a limited number of PCI
> winmodems but nothing for USB-winmodems.
> You are SOL.
> -----Original Message-----
> From: owner-freebsd-questions at
> [mailto:owner-freebsd-questions at]On Behalf Of Warren
> Block
> Sent: Thursday, June 08, 2006 9:29 AM
> To: Steve Bertrand
> Cc: 'John Andrewartha'; 'freebsd-questions at FreeBSD.ORG'
> Subject: RE: USB-Serial ??
> On Wed, 7 Jun 2006, Steve Bertrand wrote:
>>> The saga of the 3G modem.  Labeled in AU as the Maxon MM 5500c.
>>> This device is a modem on the usb bus, it looks like and
>>> understands the at commands. Under XP.
>>> I am using fbsd 6.1.
>>> How do I get ppp to talk to it?
>>> The man pages keep pointing to /dev/cuaU? A device that does
>>> not exist yet.
>> Don't know about the rest, but in FBSD 6+, the serial devices are
>> /dev/cuad0 for COM1 and /dev/cuad1 for COM2.
>> Try a:
>> # cu -l /dev/cuad0 to see if you can connect to the device.
> He said it was USB, which should be /dev/ucom0.
> -Warren Block * Rapid City, South Dakota USA
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Loren M. Lang
lorenl at

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