Anyone aware of TTL serial port pins on these boxes?

[JoKeRz]

I apologize if this has been asked before (I did I quick search and could not find it). Does anyone know if these K(/T)-R42 type of devices carry pins for a serial console connection (using a TTL voltage converter)? I've looked at several pictures of boards online and wonder if those 3 unsoldered pins shown below could be GND/TX/RX.



I am looking to have a serial connection for more detailed troubleshooting and de-bricking options (so I can be more adventurous in my mod tentative J).
As a reference, Omegamoon has how to add such pins to the RK3188 TV slick MK908: http://www.omegamoon.com/blog/static.php?page=mk908_serial_console. I imagine there should be a way to do with the K-R42s.

Thanks for any info you guys may have on that.

[endera]

I apologize if this has been asked before (I did I quick search and could not find it). Does anyone know if these K(/T)-R42 type of devices carry pins for a serial console connection (using a TTL voltage converter)? I've looked at several pictures of boards online and wonder if those 3 unsoldered pins shown below could be GND/TX/RX.



I am looking to have a serial connection for more detailed troubleshooting and de-bricking options (so I can be more adventurous in my mod tentative J).
As a reference, Omegamoon has how to add such pins to the RK3188 TV slick MK908: http://www.omegamoon.com/blog/static.php?page=mk908_serial_console. I imagine there should be a way to do with the K-R42s.

Thanks for any info you guys may have on that.

what results?

[SolarWarez]

This three pinholes are really serial port.
If count from left to right it is: Rx, Tx and Gnd. I mark them on picture too.
Rx - receive data pin
Tx - transmit data pin
Gnd - ground pin

Take in account that this signals are marked from board point of view, so if you want read serial port output then you must connect you Serial-to-TTL converter Rx pin with this onboard Tx pin and vice versa.

And I hope, that you already know that it is TTL levels input/output so you must use Serial-to-TTL converter and do not try to connect directly to PC COM port, I just remind...

[JoKeRz]

Awesome work, SolarWarez! Thanks for being courageous enough to try the port. I will
solder pins on my T-R42 rev1.1 later this week and check the messages that come
out during boot. Having the serial port should give us extra confidence to try
our own compiled kernels, etc.

[SolarWarez]

You are welcome.

It took 1 minute to check this pinholes by oscilloscope and determine where is Tx.
I am already solder connector to my T-R42 clone board. I used connector from PC fan because they have 3 pins and a latch that allow to don't worry about wrong insertion (but it looks quite cumbersome).

All works fine.

[node]

H ave you had success with this method of unbricking any units?

[chenrp]

You are welcome.

It took 1 minute to check this pinholes by oscilloscope and determine where is Tx.
I am already solder connector to my T-R42 clone board. I used connector from PC fan because they have 3 pins and a latch that allow to don't worry about wrong insertion (but it looks quite cumbersome).

All works fine.

Does the fan works with speed control?