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echo: linux
to: All
from: Simon Geddes
date: 2019-08-09 13:48:42
subject: cdcacm modem, device_reference, Multitech modem

Hi all,

First post in this echo..very glad to be here!

I have a Multitech Multimodem ZBA USB to serial modem. I plug it into my
Lubuntu set up and it works beautifully, giving me a /dev/serial/ directory
and a modem lit up and ready for serial action!

As this is a cdcacm modem, I believe it uses some modeswitch byte sequence
to initiate it, which is usually kept in a device reference file. However I
have been informed that this modem is supported at a kernel level and its
reference is therefore missing from the device reference file which other
cdcacm modems require (I think these are typically 3g cell network modems -
mine is a landline device).

When I open dev/serial// there are two files in there which are both
symbolic links. I don't really know what that means, not being very au fait
with Linux. I've tried to copy those files to external media without
success. I've also tried to open the files (required sudo) to see if they
contain any sort of sequence of bytes which the modem is using it initiate
itself.

Why am I bothered about this if it's working? I want to try and get it
working under MorphOS (an Amiga-like OS for PPC hardware) and think this
byte sequence holds the key. Then again, it might not.

Apologies for the ramble. Hoping some of this might make sense to someone
who can point me in the right direction. It doesn't make much sense to me!
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