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Topics - Alejandro

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Hello there,

First post. I am not really sure if this post should go into the drivers section or hardware/software section, anyway:

At the moment I am making use of FT4232H FTDI device to be able use up to 4 RS232/485 COM ports from a given USB. Currently the O.S. I am using is a custom Linux distribution with kernel 4.14.92 .
After much debugging and testing I have discovered that, whenever I make use of one of the four COM interfaces that the device creates , particularly COM2, another device communications are interrupting and stops communicating from that moment . This is weird for me as this device, which is a ST60 2230-PU Wifi+ Bluetooth device, is connected on another USB bus on the same HUB . Hub model is  USB5807. For more details, Wifi+Bluetooth device is connected to downstream P5 and the FT4232H is connected to the downstream P7 of this HUB. 
I attach a image of my setup for clarification purposes.

Whenever I use any of the other 3 COM interfaces created by the FTDI I find no compatibility issues. I have some doubts regarding what may be happening:

- Could there be any difference in the behavior of the 4 ports (COM1 to COM4 ) regarding USB communications ? 
- What can be producing USB communication issues in the other USB bus?
- Is there anything we may have not considered in the hardware design regarding FTDI ?

I already contacted the Wifi+ Bluetooth manufacturer and they are not aware of problems like this one.


Thank you very much! Any help will be appreciated!
Alejandro

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