htekin42
Member level 2
Dear all,
I have solved lots of my problems here and I am stuck again in one situation.
I have a terminal pc with 2 usb port and I need to expand usb and need to convert rs232. One hub has 4 usb connector and other one has 5 ftdi232rl to convert usb to rs232.
Terminal uses GL850G to expand usb on terminal.
I designed to board because of limited area. and connected one above the other. and made the 8 pin connection between them for data lines and 2pin power supply. My problem is they are not working correctly.
I assemblied 3 board and I have 3 different situatin on them. Fisrtly I connected the board and pc saw the USB hubs but did not see the ftdi converters. Second board saw the 1 hub with ftdi converters. and last one saw the only one hub with usb connectors. I also tested the first board which saw the 2 hub something like this, I removed one ftdi chip because I read something enumeration of the FTDI chips and but it did not see the other ftdi chip. only one chip was connected to boards.
I supplied them from therminal and external supply but nothing changed.
Could you please help me about this situation.
Thanks
Best Regards
Here are the schematics
View attachment Board 1.pdf
View attachment Board 2.pdf
I have solved lots of my problems here and I am stuck again in one situation.
I have a terminal pc with 2 usb port and I need to expand usb and need to convert rs232. One hub has 4 usb connector and other one has 5 ftdi232rl to convert usb to rs232.
Terminal uses GL850G to expand usb on terminal.
I designed to board because of limited area. and connected one above the other. and made the 8 pin connection between them for data lines and 2pin power supply. My problem is they are not working correctly.
I assemblied 3 board and I have 3 different situatin on them. Fisrtly I connected the board and pc saw the USB hubs but did not see the ftdi converters. Second board saw the 1 hub with ftdi converters. and last one saw the only one hub with usb connectors. I also tested the first board which saw the 2 hub something like this, I removed one ftdi chip because I read something enumeration of the FTDI chips and but it did not see the other ftdi chip. only one chip was connected to boards.
I supplied them from therminal and external supply but nothing changed.
Could you please help me about this situation.
Thanks
Best Regards
Here are the schematics
View attachment Board 1.pdf
View attachment Board 2.pdf