[SOLVED] Two FTDI devices connected and only one is recognized

schuurs · 05-22-2019, 07:32 AM

I have two devices connected to my RHEL5.11 workstation that are both using an FTDI chip. one is an USB to RS232 device and the other is a LED beacon.

For both, a udev rule is implemented.

USB-to-RS232

Code:

KERNEL=="ttyUSB*", SYSFS{idVendor}=="0403", SYSFS{idProduct}=="6001", SYSFS{product}!="SPOT", SYMLINK+="lldiag"

LED beacon

Code:

SYSFS{idProduct}=="6015", SYSFS{idVendor}=="0403", RUN+="/sbin/modprobe -q ftdi-sio product=0x6015 vendor=0x0403"

It seems however, that only the USB-to-RS232 device with ProductID 0x6001 is recognized and a /dev/usb/ttyUSB* is created. non is created for the LED beacon with ProductID 0x6015.

If I restart the workstation and only connect the LED beacon, a /dev/usb/ttyUSB* is created.

Attached you will find the udevinfo content of each device if only that device is connected and the dmesg information.

when running lsusb, i get:

Code:

Bus 002 Device 002: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 002 Device 003: ID 0403:6015 Future Technology Devices International, Ltd Bridge(I2C/SPI/UART/FIFO)

If both devices are connected, the LED beacon connection ends up in /dev/.udev/failed.

Do you have an idea what could be wrong?

business_kid · 05-26-2019, 05:28 AM

Quote:

RHEL5.11

That's an old system. If you have RH support, why bother us? If not, You need to explain a lot more. Serial ports haven't been fitted for nearly 20 years, except mebbe Industrial PCs.

Anyhow, if memory serves, it should be ttyS1, ttyS2, etc. a tty is a console. 2 serial ports is ok; 4 is stretching it, but doable. After that, it has been done but you're on your own.

schuurs · 05-31-2019, 03:04 AM

By using pyftdi, I was able to control the LED beacon with use of the VendorID and ProductID, without using /dev/tty*

Why RHEL5.11?
That is the problem with systems that run specific software for specific hardware.
The hardware manufacturer is working on new software for RHEL 7.x