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Doctorwho8
Posts: 56
Joined: Mon Dec 31, 2012 11:00 pm
Location: Astoria NY
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Enabling a second serial console

Fri Aug 25, 2017 10:26 pm

Hello!
I have a RPi3 running the latest release, the one code named "stretch". So I've got a FTDI based serial to USB2 device plugged into the main console port on top. That is an FTDI Friend as its called has its RD and TXD leads attached to appropriate places on top. I use it to confirm that the WiFi adapter on the device has found the access point that this configuration is using.

Of the four USB ports I have connected to one of them a Pi Zero configured as a USB Gadget device. The other one has a USB to Serial adapter plugged into it. This is one also based on the FTDI chips and has a MAXIM RS232 to TTL translator chip on it.
This is a Parallax USB to Serial (RS-232) Adapter with Cable https://www.parallax.com/product/28031 .

I have a cable connected to the DB9 end that provides the nullmodem function, and it would be connected to a TRS-80 Model 102.

That idea comes from an article from 2015, https://arstechnica.com/information-tec ... odel-100/.

In that article he explains how to enable access to that older computer for the Raspian one, via the methods used before SystemD became the default.

So? Does the group have an idea how to enable a second console using that hardware?

I'd rather not take myself back several releases to a period well before Stretch for running this Raspberry Pi.

Interestingly enough I can connect to the Pi Zero in that mode.
-------------------
Gregg
Doctor Who8

User avatar
Doctorwho8
Posts: 56
Joined: Mon Dec 31, 2012 11:00 pm
Location: Astoria NY
Contact: Website

Re: Enabling a second serial console

Sat Aug 26, 2017 4:26 am

Hello!
Oddly enough I found out what I needed to know by visiting the Debian Wiki; The information was found here:
https://wiki.debian.org/systemd Most of the way down I found what I needed to enable the console as first entering:
systemctl enable serial-getty@ttyUSB0.service and next entering the appropriate information for the user "pi".
Then by entering systemctl start serial-getty@ttyUSB0.service and again following the screen prompts, I again needed to enter same user's information.

From there I was able to see much the same information on the TRS-80 Model 102, (after a fashion) that I can see on the Putty screen on the laptop.

I strongly suggest that the Wiki described there be required viewing by anyone who isn't conversant with the methods of SystemD. And that includes myself. I normally run a different distribution who's now available for the Raspberry Pi.

However it, Slackware on ARM, does not have downloadable images available the same as Raspberry PI' Debian creation.
-------------------
Gregg
Doctor Who8

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