Hi everyone,

I came over an old Sun server which is connected to my Linux box via a serial cable. The serial settings on the Sun machine are:

9600 baud
8 bit w/o parity and 1 stop bit

On my Linux box, the serial port is set to /dev/ttyS5.

How do I connect to the machine via this serial connection?

I don't have 'kermit' and I tired with 'agetty 9600 /dev/ttyS5' w/o any success.

I would greatly appreciate any help or suggestions,

Toshi

Are you using a modem or an standard serial port?

It's a standard serial port or more precise - a 16550 UART serial COM port.

Thanks,

Toshi

Well,
I don't know what are you trying to. Lets start by the first things first.
You have to connect your machines with a null modem cable. Basically, you need three wires in this cable: logical ground connecting both pins 7 of db25, pin 2 of one side connecting pin 3 of the other side and pin 3 of one side connecting pin 2 of the other side. All this description is for 25 pin connector. You may google with "null modem" between quotes. After having a cable be sure you have the you Sun port enabled for login and use minicom on the linux side to configure the port and open a session in the Sun. When you get this, you know that all the physical configuration is ok.
After this, I need to know if you want to just open a session in linux from the Sun, or want to establish a network connection. All this is possible, depending on the system software you have on the Sun machine.

There is a pretty good "Howto" on this at the LDP site. It's titled the "Serial Laplink" howto as I recall.

Thanks for your replies!

I attached a DB25->RJ45 adapter to the Sun machine and a DB9->RJ45 adapter to one of the COM ports on the Linux box. Finally, I connected the two machine with a RJ45 cable.

I tried minicom, but I wasn't able to get it to connect.

I installed kermit, but it still doesn't connect:

(/root/) C-Kermit>set line /dev/ttyS5
(/root/) C-Kermit>set speed 9600
/dev/ttyS5, 9600 bps
(/root/) C-Kermit>set parity none
(/root/) C-Kermit>set stop-bits 1
(/root/) C-Kermit>set carrier-watch off
(/root/) C-Kermit>connect
Connecting to /dev/ttyS5, speed 9600
Escape character: Ctrl-\ (ASCII 28, FS): enabled
Type the escape character followed by C to get back,
or followed by ? to see other options.
----------------------------------------------------

nothing happens after this - the connection is never established...

Is there something I'm missing? or is it some hardware/driver issue?

Toshi

By the way, I want to bring up the Sun machine's console (doesn't have local graphical console).

Toshi

It's your physical connection. Both the machines may have transmit connected to th transmit of the other and receive connected to receive of the other. Look for "null cable".

Ok, I see. So I need somekind of cross-over cable? or can set some parameter in Kermit?

Thanks,

Toshi

Yes, Mr. this is another name the "null-modem" cable is known.

Thanks.

I am using null-modem cable. I tried with a standard cable and a null-modem cable, but neither worked. I also tried to connect to another device I have w/o success (I know I was able to connect to it using Windows' hyper terminal before). Any ideas?

I would appreciate any suggestion, advice, ideas...

Toshi

Here's a link to the howto I posted about earlier. It's all about exactly what you're attempting.

http://tldp.org/HOWTO/Serial-Laplink-HOWTO/

Thanks,

That link is for setting up a PPP connection between a Windows box and a Linux box. I want to set-up a ASCII terminal and bring up the Sun machine's console.

Toshi

I tried Windows' hyper terminal and it worked w/o any problems...?!? Perhaps I need to set some parameter in Kermit which Windows sets automatically...? In windows I just set the baud rate, parity, data bits and stop-bits, and pressed 'ok'...

Maybe it's a driver issue in Linux even though 'setserial -a' produce a nice output...

Toshi

You have to set some parameters. Your serial is waiting for modem signaling. Try This command will tell the serial driver this is a local port.