Tx is not working in FT232 Serial USB to UART coverter in Ubuntu 20.04

Asked by James A on 2020-08-01

Hai,

I connected the USB to UART converter to my Ubuntu HP Laptop , and was able to receive data via RX , but not able to send data via TX.

USB to UART converter = ft232R chip set

OS details = Ubuntu 20.04 LTS , 5.4.0-26-generic

output of
$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 138a:00ab Validity Sensors, Inc.
Bus 001 Device 002: ID 0408:5373 Quanta Computer, Inc. HP HD Camera
Bus 001 Device 004: ID 0bda:b00b Realtek Semiconductor Corp. Bluetooth Radio
Bus 001 Device 007: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

$ dmesg | grep usb
[ 249.066889] usb 1-1: Detected FT232RL
[ 249.067634] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0
[ 407.765448] usb 1-1: USB disconnect, device number 5
[ 409.236975] usb 1-1: new full-speed USB device number 6 using xhci_hcd
[ 409.394606] usb 1-1: New USB device found, idVendor=0403, idProduct=6001, bcdDevice= 6.00
[ 409.394613] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 409.394618] usb 1-1: Product: FT232R USB UART
[ 409.394622] usb 1-1: Manufacturer: FTDI
[ 409.394625] usb 1-1: SerialNumber: AL004C2K
[ 409.398428] usb 1-1: Detected FT232RL
[ 409.399503] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0
[ 463.286636] usb 1-1: USB disconnect, device number 6
[ 465.408665] usb 1-1: new full-speed USB device number 7 using xhci_hcd
[ 465.562026] usb 1-1: New USB device found, idVendor=0403, idProduct=6001, bcdDevice= 6.00
[ 465.562029] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 465.562031] usb 1-1: Product: FT232R USB UART
[ 465.562033] usb 1-1: Manufacturer: FTDI
[ 465.562034] usb 1-1: SerialNumber: AL004C2K
[ 465.565150] usb 1-1: Detected FT232RL
[ 465.565575] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0
[ 1538.270228] usb 1-1: USB disconnect, device number 7
[ 1540.657568] usb 1-1: new full-speed USB device number 8 using xhci_hcd
[ 1540.815311] usb 1-1: New USB device found, idVendor=0403, idProduct=6001, bcdDevice= 6.00
[ 1540.815320] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1540.815326] usb 1-1: Product: FT232R USB UART
[ 1540.815330] usb 1-1: Manufacturer: FTDI
[ 1540.815335] usb 1-1: SerialNumber: AL004C2K
[ 1540.819232] usb 1-1: Detected FT232RL
[ 1540.820278] usb 1-1: FTDI USB Serial Device converter now attached to ttyUSB0

Regards,
James A

Question information

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Last query:
2020-08-01
Last reply:
2020-08-17
James A (james-gct) said : #1

Hai ,

To add on , I was using minicom to open the serial port with this cmd

sudo minicom -D /dev/ttyUSB0

Regards,
James A

Manfred Hampl (m-hampl) said : #2

for diagnostic purposes, what is the output of the commands

ls -l /dev/ttyUSB0
groups

Launchpad Janitor (janitor) said : #3

This question was expired because it remained in the 'Needs information' state without activity for the last 15 days.