TTL to RS232 console adapter

[blood]

Has anyone made (or bought!) an adapter that takes the 3 pin TTL-level console port and converts it to a DB9 or RJ45 port that can mount in a PCI bracket? If so, what did you use? And what port did you use to power it as the console port does not provide a 3.3V or 5.5V pin for power (there is a pin labeled "RSV" which seems to supply 5V and may be usable but I don't know its capabilities).

 

I've done this before for other systems using these without too much trouble but when I tried with this board it's not working. Admittedly I haven't hooked it up to a scope to look at the signals, but I'm suspicious of the high baudrate being to blame. I have a couple USB adapters that work (so I know the console itself works), but I want to rackmount this box and wire it up to my console server. I need RS232 to do that.

[prahal]

Sorry for the late reply. Note the baud rate is set in U-Boot to 1.5Mbps (and your device tells max 1Mbps).

[blood]

Hah - thank you for pointing that out - I completely overlooked the rate listed in the part’s title.

 

Do you happen to know of a similar part that supports the baud rate of these devices?

[Werner]

Some chips that support 1.5Mbaud and more:

 

- FT232R

- CH340G

- CP2104

[blood]

Do you know of any products that integrate one of those chips such that you can plug in DB9 or RJ45 RS232 and achieve a console on a rockchip system that uses 1.5mbit @ TTL voltages? I have console cables that work now but via USB and I want to wire it up to my terminal server (ideally without having to do any soldering or work my own PCB).

[eselarm]

The NanoPi-R6C (that I have) has an extra USB-C female connector, so the chip is already on the board. You just need a USB cable (so just wires with USB signal levels) to connect to laptop or any computer with USB, even smartphone.

 

RS232 is other voltage levels, long distance as well, so don't expect it to be spec compliant. USB is 5 meters. I think 1.5 Mbps is simply out of scope for RS232/DB9. Maybe netconsole is something you could use.

Edited Monday at 09:18 PM by eselarm

[Werner]

Yes, DB9 won't work.

But if, as eselarm mentions, a proper chip is on board already a simple usb-a to usb-c or c-to-c cable should do.

Check dmesg when connection to see what pops up.