Hello Armbians,

 

I am a newbie here so maybe this topic has been already discussed, if so just point me to it. Thank you.

 

I have several TP Link routers (MR-3020, MR3420) that I would like to play with, especially usin serial connection. Since I am also a newbie in this area too I would like to know if it is possible to use Orange Pi Pc board or any other Orange board to connect to those routers separately without buying those little usb to uart ttl adapters. And if it is possible, which pins from Orange board to use, those 3 TTL pins or the others from the GPIO row.

 

Thank you

Have you read that tutorial ?

 

http://johanbijker.blogspot.fr/2012/07/tp-link-mr3420-serial-connection-with.html

 

It looks like MR3420 use 3.3V and not TTL (5V) logic. You should be able to adapt this to other arm cards but beware that serial ports are ttyAMAx on raspbian and generaly ttySx on other systems.

 

If you need to cross TTL and 3.3V logic, have also a look at level shifters in :

 

http://elinux.org/RPi_GPIO_Interface_Circuits

 

Now be prepared to have occasionally strange effects in some case as it sometimes prevent to do a full hardware reset (that means that if your system crash, you may have to unplug serial connection). You should make some test if you want to use that remotely with an unattended system.