The Commubox FXA291 by Endress+Hauser AG is a USB serial converter
based on FT232B which is used to communicate with field devices.

It enumerates using the FTDI vendor ID and a custom PID.

usb 1-9: New USB device found, idVendor=0403, idProduct=e510, bcdDevice= 4.00
usb 1-9: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-9: Product: FXA291
usb 1-9: Manufacturer: Endress+Hauser
usb 1-9: SerialNumber: 00000000
ftdi_sio 1-9:1.0: FTDI USB Serial Device converter detected
usb 1-9: Detected FT232B
usb 1-9: FTDI USB Serial Device converter now attached to ttyUSB0

Signed-off-by: Tim Pambor <timpambor@gmail.com>
Cc: stable@vger.kernel.org
---
 drivers/usb/serial/ftdi_sio.c     | 2 ++
 drivers/usb/serial/ftdi_sio_ids.h | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 88dd32da82c2b..c6ffa23bcc8f7 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1072,6 +1072,8 @@ static const struct usb_device_id id_table_combined[] = {
 	{ USB_DEVICE_INTERFACE_NUMBER(ALTERA_VID, ALTERA_UB3_602E_PID, 3) },
 	/* Abacus Electrics */
 	{ USB_DEVICE(FTDI_VID, ABACUS_OPTICAL_PROBE_PID) },
+	/* Endress+Hauser AG devices */
+	{ USB_DEVICE(FTDI_VID, FTDI_EH_FXA291_PID) },
 	{ }					/* Terminating entry */
 };
 
diff --git a/drivers/usb/serial/ftdi_sio_ids.h b/drivers/usb/serial/ftdi_sio_ids.h
index 6c76cfebfd0e4..968e6ea3177f7 100644
--- a/drivers/usb/serial/ftdi_sio_ids.h
+++ b/drivers/usb/serial/ftdi_sio_ids.h
@@ -617,6 +617,11 @@
 #define FTDI_CUSTOMWARE_MINIPLEX2WI_PID	0xfd4a	/* MiniPlex-2Wi */
 #define FTDI_CUSTOMWARE_MINIPLEX3_PID	0xfd4b	/* MiniPlex-3 series */
 
+/*
+ * Endress+Hauser AG product ids (FTDI_VID)
+ */
+#define FTDI_EH_FXA291_PID	0xE510
+
 
 /********************************/
 /** third-party VID/PID combos **/

---
base-commit: 8cdeaa50eae8dad34885515f62559ee83e7e8dda
change-id: 20260711-fxa291-2e590229f630

Best regards,
--  
Tim Pambor <timpambor@gmail.com>

On Sat, Jul 11, 2026 at 05:36:30PM +0000, Tim Pambor wrote:
> The Commubox FXA291 by Endress+Hauser AG is a USB serial converter
> based on FT232B which is used to communicate with field devices.
> 
> It enumerates using the FTDI vendor ID and a custom PID.
> 
> usb 1-9: New USB device found, idVendor=0403, idProduct=e510, bcdDevice= 4.00
> usb 1-9: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> usb 1-9: Product: FXA291
> usb 1-9: Manufacturer: Endress+Hauser
> usb 1-9: SerialNumber: 00000000
> ftdi_sio 1-9:1.0: FTDI USB Serial Device converter detected
> usb 1-9: Detected FT232B
> usb 1-9: FTDI USB Serial Device converter now attached to ttyUSB0
> 
> Signed-off-by: Tim Pambor <timpambor@gmail.com>
> Cc: stable@vger.kernel.org

Applied, thanks.

Johan