Looking for dialup hardware solution

Evan Leibovitch evan-ieNeDk6JonTYtjvyW6yDsg at public.gmane.org
Sun Jul 13 02:53:37 UTC 2008

phiscock-g851W1bGYuGnS0EtXVNi6w at public.gmane.org wrote:
>> There are some USB-to-DB9 serial adaptors but I don't know how well they
>> handle the complexities of RS-232 modem control.
> For what it's worth, we found that USB-Serial control includes hardware
> flow control (RTS-CTS handshaking).
Good to know. It's just that I have too many recollections of the
nightmares I had with breakout boxes trying to make various kinds of
modems work with various kinds of serial ports. If only hardware
handshaking was always just RTS/CTS. :-)

(On a DB9 cable things weren't that bad, there weren't too many ways to
screw up that spec. On a DB25 pinout -- like the kind on Walter's
Sportster modem -- there are many more ways to complicate things (In
fact I recall that DTR/DSR hardware handshaking was at least as or more
important than RTS/CTS, in the heyday of these modems.)

Does the USB-DB9 adaptor support all eight pins (we can do without Ring
Indicator, but let's not forget the venerable Carrier Detect ;-) )?

- Evan

The Toronto Linux Users Group.      Meetings: http://gtalug.org/
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://gtalug.org/wiki/Mailing_lists

More information about the Legacy mailing list