Still working on the maker space and expanding my networking lab. I added a cisco 1721 router with a 10-base T wan interface card and a serial 1T WIC in addition to the built-in fast ethernet interface. I also added an old cisco 2514 with two built-in AUI (ethernet) interfaces and two serial interfaces.
The computer at my work bench doesn’t have a serial interface that I can connect to the routers’ console interfaces, and I was too lazy to go get my usb to serial converter out of my van; especially when I had my pine64 nearby with an rs-232 to TTL converter. I fired up my pine64 and connected the rs-232 to TTL converter to the UART pins on the pi-2-bus. The converter and the console port of the routers are both DTE devices, so a null-modem (serial crossover) cable / adapter are necessary. I hooked it all up like so:
Here you can see I have my pine64 connected to a cisco console cable via a null modem adapter and a gender changer. First I had to ssh into the pine. Now to install screen on my pine64.
sudo apt-get install screen
sudo screen /dev/ttyS2 9600
The second command tells screen to use ttyS2, which is the serial interface that is on the pi-2 bus and use 8-N-1 and 9600 baud. Now I’m in.