[raspberry-vi] Re: telnet
- From: "Michael A. Ray" <mike.ray@xxxxxxxxxxxxxx>
- To: raspberry-vi@xxxxxxxxxxxxx
- Date: Sat, 30 Mar 2013 16:48:09 +0000
Glenn,
I would not advise you to use the I2C pins of the GPIO bus to do what
you want to do. These pins (I think) are TTL level pins and as such
won't drive RS232 to the right levels. I might be wrong about this so
don't quote me.
A much safer way to do what you want to do is to get hold of a USB to
serial dongle. I bought a 'prolific' chip-set device from Amazon for a
few quid. I searched for 'PL2303'. Some people say the prolific ones
are flaky but mine works fine with a digital multimeter I have with a
serial interface.
When I plug it in and boot Raspbian it gets the device name
/dev/ttyUSB0. It might be /dev/ttyUSB1 or more for you if you have
other things installed like a USB Braille display that uses the USB to
serial UART converter driver.
In the file /etc/inittab you will find a line which reads:
# Example how to put a getty on a serial line (for a terminal)
After that line there are two examples of how to do this.
To get a login process listening to the result of plugging in a USB to
serial converter change one of the lines, probably the first one to this:
T0:23:respawn:/sbin/getty -L ttyUSB0 9600 vt100
Note the value /dev/ttyUSB0, as mentioned above you might have
/dev/ttyUSB1 or even 2.
The value 23 is the port number of telnet.
You will also have to change 9600 to whatever speed the device you want
to connect with uses.
I have not tested the addition of this line to /etc/inittab but the
converter dongle I already use.
I will test this and add it to the wiki because it will be the only way
for us to run a Model A headless. The Model A has no ethernet port. We
could use a wifi dongle of course. But that raises a nasty chicken and
egg scenario.
Mike
On 30/03/2013 14:42, Glenn wrote:
> Hi,
> Unfortunately, I forgot how I got into my RPI from the laptop, without first
> going through my old router.
> But when I do get in again, via SSH, I will need to set the RPI to
> automatically go into a Telnet session I believe.
> I have tried hooking my old notetaker, an Artic Braille Pad, from the 9-pin
> serial out, to the Ethernet line on the RPI.
> I have tried both standby and terminal modes on the Braille Pad with no
> luck.
> Maybe the serial settings are wrong, but I set the baud rate to 15,500, and
> 8, 1, which is the default, except for the baud rate, which is as fast as
> the notetaker can go.
> Does anyone know how I may get these two to talk with each other?
> Glenn
>
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>
--
Michael A. Ray
Analyst/Programmer
Witley, Surrey, South-east UK
github username: cromarty
raspberrypi.org username: cromarty
Ham Radio Call-sign: G4XBF, licensed since 1982
'Entia non sunt multiplicanda praeter necessitatem' - Ockham's razor
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http://www.raspberryvi.org/
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The raspberry-vi mailing list
Archives: //www.freelists.org/archives/raspberry-vi
Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
-----------------------------------------------------------
Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi
Foundation.
This list is not affiliated to the Raspberry Pi Foundation and the views and
attitudes expressed by the subscribers to this list do not reflect those of the
Foundation.
Mike Ray, list creator, January 2013
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