Spacelynk USB communication towards FTDI

[spapantoniou85]

Hello to all,

I have an issue with the integration of a USB device using Spacelynk.

The 3rd party device can speak with my pc using the usb cable without any issue and I can send commands using different 3rd party softwares.

When I connect the device to Spacelynk using the same usb cable I can identify the usb using the necessary script. It is strange that I see the message about the latency timer. What could be the issue (see the attached image)

In any case the FTDI appear on my spacelynk as "/dev/ttyUSB0".

Code:

require('serial')
port = serial.open('/dev/ttyUSB0', {  baudrate = 9600,  databits = 8,  stopbits = 1,  parity = 'none',  duplex = 'half'
})

I try to open the serial port to write a message but I get the following error:

Code:

Feb 1 09:47:21 spaceLYnk kern.err kernel: [ 1092.385584] ftdi_sio ttyUSB0: failed to get modem status: -32
Feb 1 09:47:21 spaceLYnk kern.err kernel: [ 1092.384593] ftdi_sio ttyUSB0: failed to get modem status: -32
Feb 1 09:47:21 spaceLYnk kern.err kernel: [ 1092.383582] ftdi_sio ttyUSB0: urb failed to clear flow control
Feb 1 09:47:21 spaceLYnk kern.err kernel: [ 1092.382563] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
Feb 1 09:47:21 spaceLYnk kern.err kernel: [ 1092.380585] ftdi_sio ttyUSB0: urb failed to clear flow control
Feb 1 09:47:21 spaceLYnk kern.err kernel: [ 1092.379572] ftdi_sio ttyUSB0: ftdi_set_termios urb failed to set baudrate
Feb 1 09:47:21 spaceLYnk kern.err kernel: [ 1092.378572] ftdi_sio ttyUSB0: ftdi_set_termios FAILED to set databits/stopbits/parity

The message does not arrive to the device.

I have tried with different usb cables but no success. 

I have tried also to provide separate power to the usb cable using a second usb in the following hardware configuration:

• (vcc+gnd) from 1 usb A connected to PC 
  
• (tx,rx,gnd) from 1 usb A connected to Spacelynk
  

Any idea why this is happening?

How can I approach this problem?

Thank you