USB TTL cable no longer working

[peterz]

[quote pid='3287' dateline='1457557488']
Combine both Euler and Pi2 bus, the maximum available UART is 4.

There is also EXP bus and Wifi/BT Connector (J50). I suppose those would work as well (I won't use wifi/BT modul).

You plan to max out all UART ports :-)
[/quote]

hehe, yes indeed.

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Thanks for the replies.

I use Ubuntu and the appropriate devices are autocreated in /dev/. The default is /dev/ttyUSB0.
I tried two different UART cables, both with the following characteristics,

Code:

[46297.049241] usb 1-9: new full-speed USB device number 4 using xhci_hcd
[46297.178108] usb 1-9: New USB device found, idVendor=067b, idProduct=2303
[46297.178116] usb 1-9: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[46297.178121] usb 1-9: Product: USB-Serial Controller
[46297.178124] usb 1-9: Manufacturer: Prolific Technology Inc.
[46298.217991] usbcore: registered new interface driver usbserial
[46298.218005] usbcore: registered new interface driver usbserial_generic
[46298.218015] usbserial: USB Serial support registered for generic
[46298.219383] usbcore: registered new interface driver pl2303
[46298.219397] usbserial: USB Serial support registered for pl2303
[46298.219411] pl2303 1-9:1.0: pl2303 converter detected
[46298.220266] usb 1-9: pl2303 converter now attached to ttyUSB0

I tried both the PINs 6/8/10 (GND, TX, RX) on the Euler connector and also PINs 6/7/8 (GND, TX, RX) on the Exp connector. 
I did not get any response at speed 115200.
I cannot figure out what changed so that now I do not get any output from the serial cable.
If a solution is found, I will document the whole process on the wiki!

Can you please provide output of "cat /etc/inittab" and "cat /boot/grub/grub.cfg" ?
Havent you tried minicom instead of cu for communication with serial port?

Code:

sudo minicom --device /dev/ttyUSB0

First you might need to configure serial port on PINE side.

Code:

sudo minicom -s

What application do you use on your PC? Putty?
Do you have the same settings on both sides (PINE and your PC)?

Try to configure following on both sides.
Bits per sec    :  9600
Data bits       :     8
Parity          :  none
Stop bits       :     1
Flow control    :  none