a little hardware help, please - if anyone can recall.

[thecheapseats]

It has been a long time since I wanted to connect to the interior serial ports of an asus router - and cannot locate my notes from a few years ago.

Does anyone recall what the TTL serial levels are in these things? - are they 3.3v, 2.5v or 1.8v?

I cannot locate my notes from a few years ago and would prefer not damaging the device. Thanks in advance.

 

[Tech9]

Check Vcc, the TTL is between 0V and Vcc. May vary model to model.

 

[thecheapseats]

Check Vcc, the TTL is between 0V and Vcc. May vary model to model.

thanks - I know - but I loaned my Fluke to a kid for his school project last night - my own fault...

 

[Tech9]

In most cases <1V is low, >2V is high, 0V to 3.3-5V range.

 

[sfx2000]

3V3DC is the UART voltages typical for most Broadcom devices- most USB-UART adapters compatible with a Raspberry Pi should be good enough...

This might be helpful as well...

Unbrick Asus RT-AC68U router over serial connection using a Raspberry Pi

I recently did an RMerlin upgrade and botched it. I can`t say for sure how but likely not resetting the router properly and unplugging the unit at a critical point. Tried the firmware recovery, setting IP on computer and holding reset. Twice, recovery loaded to about 80% then pooched. After...

www.snbforums.com

Best of luck..

 

[thecheapseats]

thanks all - I had my giant bag of Jtag assorted devices and chip-clips collected over four decades and a rat's nest of serial cable hacks for pcb header pins - as well as just about every serial-com chipset ever made since I hit puberty - but no meter until tomorrow... got it jacked out @3.3 and have output onto a console - so I'm good...