Multiple serial consoles via null modem cable

Ronald Klop ronald-freebsd8 at
Sun Jan 17 13:32:27 UTC 2010

On Fri, 15 Jan 2010 07:34:17 +0100, Marin Atanasov <dnaeon at>  

> Thank you a lot for your feedback!
> Now to the real question again, because I'm a little confused now - can I
> still get a usb-to-serial port converter having let's say 8 serial ports  
> and
> then connect each machine to the usb-to-serial hub and manage them  
> remotely
> from a single location (the host having the usb-to-serial hub)? That way  
> I
> just specify a serial port number and I get to a specific machine?
> The model provided by Boris looks nice, and that was my initial idea, but
> I'm not sure if I could get it working under FreeBSD. Is conserver or
> conserver-com able to handle this? I know that cu uses COM1 only, but  
> will
> conserver able to handle serial consoles on different ports, since the
> usb-to-serial port would appear as multiple serial ports.

You can provide cu with the port to connect to on the command line.

cu -l cuaU0 -s 115200
cu -l cuaU1 -s 115200

You can not connect several servers on 1 serial port, but you can connect  
several servers on several serial ports. With serial-over-usb it scales to  
many serial ports.


> Thank you and regards,
> Marin
> On Tue, Jan 12, 2010 at 7:04 PM, Boris Samorodov <bsam at> wrote:
>> On Tue, 12 Jan 2010 17:14:44 +0200 Marin Atanasov wrote:
>> > I'm thinking about the following situation - 1 system acting like a  
>> host
>> > with a serial port hub, each port of the hub is connected to a  
>> different
>> > machine on sio0, using null modem cables.
>> Along with milti-io serial cards we use multi-usb serial
>> converters, such as SUNIX UTS7009P (7 USB to serial adapter):
>> --
>> WBR, Boris Samorodov (bsam)
>> Research Engineer, Telephone & Internet SP
>> FreeBSD Committer, The Power To Serve

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