[Ftdi-usb-sio-devel] no signal from FT232RL

[Asher <as...@gm...>]

I am using a FT232RL on a specialty board and connecting it with a USB cable
to a Linux box running 2.6.31-02063113-generic.  When I power up the board
and connect it, dmesg shows

[ 5615.720067] usb 2-2: new full speed USB device using ohci_hcd and address
5
[ 5615.954232] usb 2-2: configuration #1 chosen from 1 choice
[ 5615.962172] ftdi_sio 2-2:1.0: FTDI USB Serial Device converter detected
[ 5615.962213] usb 2-2: Detected FT232RL
[ 5615.962217] usb 2-2: Number of endpoints 2
[ 5615.962220] usb 2-2: Endpoint 1 MaxPacketSize 64
[ 5615.962222] usb 2-2: Endpoint 2 MaxPacketSize 64
[ 5615.962225] usb 2-2: Setting MaxPacketSize 64
[ 5615.964167] usb 2-2: FTDI USB Serial Device converter now attached to
ttyUSB0

The board is meant to send 64 bytes repeatedly and to accept 64-byte
commands.

When I use a modem program, such as gtkterm, connecting it to /dev/ttyUSB0,
no matter how I set combinations of baud rate, parity, stop bits, flow
control, I cannot detect any data coming from the card.  On the other hand,
using Windows XP Embedded, the LabView program that calls the Windows driver
for the FTDI chip is able to function properly, both sending and receiving.
I don't know why Linux only associates a single tty to the device (it has
two endpoints), and I don't know why I can't receive any data.  My attempts
to send data have also failed.