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Re: cannot talk with AT modem

A long time ago, in a galaxy far, far way, someone said...

> Hi,
> I have just installed slink on my AMD Athlon PC.
> I have an internal USR 56K modem model 2977.
> It is not a winmodem, it uses Hayes AT language.
> Under Windows 98 it is recognized at COM5 and works fine.

Having the modem recognize the Hayes AT command language is not a reliable
indicator.  Many winmodem drivers have an AT command interpreter to
satisfy older programs.

According to the USRobitics web site, this is a PCI modem device; are you
able to open the case on your computer to verify that?

The contents of the file /proc/pci will also tell us if this is a PCI

> First problem was that in /dev there were only ttyS0-ttyS3 (COM1-COM4)
> with major number 4 and minor numbers 64-67.
> I have created by hand ttyS4-ttyS7 character devices with minor numbers 68-71,
> and same owner, group and permissions and ttyS0-ttyS3.
> I hope they correspond to COM5-COM8.

Ordinarilly they would, but trying to access them will have no affect if
the serial driver can't find the serial device (the modem in this case).  
The minor numbers, however are correct.

> However when I run minicom with /dev/ttyS4 I cannot talk to the modem.
> It does not respond to "at", pressing enter, etc., no characters are echoed.

That just means the serial driver didn't find a modem for minicom to
connect to.

> wvdialconf scans my serial ports, finds active ports at ttyS0 and ttyS1
> (COM1, COM@) with no modem there (it tries to send AT commands), 
> then continues with port scan of ttyS2-ttyS7 without even attempting
> to send AT commands, i.e. I guess it did not find active serial ports there
> at all.

I looks like wvdialconf looks to see if a device is attached to
ttyS2-ttyS7 before it will try to send AT commands to it.

> Does anyone know what I can do?

We need more information first.  Without more information, all I can say
is "I don't think your modem will work with Linux".

Phil Brutsche					pbrutsch@creighton.edu

"There are two things that are infinite; Human stupidity and the
universe. And I'm not sure about the universe." - Albert Einstien

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