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Author Topic: /dev/ttyUSB* for Raspberry Pi not found not working  (Read 3774 times)


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/dev/ttyUSB* for Raspberry Pi not found not working
« on: October 30, 2020, 05:10:37 PM »


I have raspberry Pi 3 B+, I want to install the Modbus RTU to USB converter driver for USB-RS485-WE product.

I have installed the driver as per this link https://www.ftdichip.com/Drivers/D2XX/Linux/libftd2xx-arm-v7-hf-1.4.8.gz

I have followed this video : https://youtu.be/jynlynjOOek and https://www.ftdichip.com/Drivers/D2XX/Linux/ReadMe-linux.txt file .

The USB converter does not detect on my raspberry pi.

Though it showing its connected when lsusb command executed. even ls /dev command does not show /dev/ttyUSB*.

Please do needful

Thanks & Regards
Rakesh Patel

FTDI Community

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Re: /dev/ttyUSB* for Raspberry Pi not found not working
« Reply #1 on: November 02, 2020, 04:17:06 PM »

Hello Rakesh,

I note you have emailed into the support channel with this question as well.

The drivers you have installed are the D2XX API drivers, intended for use with custom software applications and will not present a COM port to the OS for the device.

The Virtual COM Port (VCP) driver for Linux (ftdi_sio) is currently maintained by the Linux Kernel team.
You should check if your kernel includes this driver, if it does not you can rebuild your kernel to include support for this.

Also, FTDI devices are not designed or marketed specifically for Modbus.
However, the RS485 units will connect at the correct signalling levels to a Modbus system.
Based on customer feedback:
If your modbus bus system uses ASCII framing it should be OK.
If your modbus system uses RTU framing then it is unlikely to work.

Best Regards,
FTDI Community