# FTDI USB Serial Device - where is ttyUSB0? **URL:** \ **Category:** mangOH Green\ **Created:** [June 1, 2016, 7:53pm UTC](https://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92 "2016-06-01T19:53:50Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![awneil](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/awneil/32/486_2.png) [@awneil](https://mangoh.discourse.group/u/awneil)\ **Post date:** [June 1, 2016, 7:53pm UTC](https://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92/1 "2016-06-01T19:53:50Z")
Cross-post from Sierra Wireless forum: [quote]When I plug in my FTDI USB Serial cable, I see: **[690.149702] usb 1-1.3.2: new full-speed USB device number 7 using msm\_hsic\_host** **[690.206805] ftdi\_sio 1-1.3.2:1.0: FTDI USB Serial Device converter detected** **[690.219624] usb 1-1.3.2: Detected FT232RL** **[690.222615] usb 1-1.3.2: Number of endpoints 2** **[690.227071] usb 1-1.3.2: Endpoint 1 MaxPacketSize 64** **[690.232748] usb 1-1.3.2: Endpoint 2 MaxPacketSize 64** **[690.236929] usb 1-1.3.2: Setting MaxPacketSize 64** **[690.248588] usb 1-1.3.2: FTDI USB Serial Device converter now attached to ttyUSB0** But there is no /dev/ttyUSB0 root@swi-mdm9x15:~# ls /dev/ttyUSB0 ls: /dev/ttyUSB0: No such file or directory root@swi-mdm9x15:~# ls /dev/ttyUSB\* ls: /dev/ttyUSB\*: No such file or directory So how do I use it ?? [/quote] [https://forum.sierrawireless.com/viewtopic.php?f=177&t=9743](https://forum.sierrawireless.com/viewtopic.php?f=177&t=9743) ---
**Author:** ![asyal](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/asyal/32/78_2.png) [@asyal](https://mangoh.discourse.group/u/asyal)\ **Post date:** [June 2, 2016, 2:47am UTC](https://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92/2 "2016-06-02T02:47:42Z")
Hi, What hadware version are you using? Note that USB0 is run by Arduino to WP connection. ---
**Author:** ![awneil](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/awneil/32/486_2.png) [@awneil](https://mangoh.discourse.group/u/awneil)\ **Post date:** [June 2, 2016, 6:19am UTC](https://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92/3 "2016-06-02T06:19:33Z")
It is a unit from the Innovation Summit last year. How do I check the version? The same happens whether I plug the FTDI cable into the USB Host socket on the main board, or the one on the IoT connector. ---
**Author:** ![awneil](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/awneil/32/486_2.png) [@awneil](https://mangoh.discourse.group/u/awneil)\ **Post date:** [June 2, 2016, 6:21am UTC](https://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92/4 "2016-06-02T06:21:12Z")
The same unit as here: > [@Firmware Update: Customer Config OK; Carrier Fails](http://mangoh.discourse.group/t/firmware-update-customer-config-ok-carrier-fails/80): > > Continuing from earlier thread, as the forum won’t let me post any more in that thread - and suggests starting a new one: Replies to questions from asyal: what version of mangoh are you using rev7 or rev8? Your module sku looks pretty old. Can you do app status? Yes, it’s quite old - one of the ones given out at the Sierra Wireless Developer Summit in Paris last year. How would I check the mangOH Rev? Or “app status”? Can you download FW again and carrier again? This time with boot pi… ---
**Author:** ![asyal](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/asyal/32/78_2.png) [@asyal](https://mangoh.discourse.group/u/asyal)\ **Post date:** [June 3, 2016, 3:26am UTC](https://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92/5 "2016-06-03T03:26:49Z")
I would recommend moving to DV3 board as we dont support very early hardware. The Innovation Summit hardware was early hardware. The USB issue could be due to the fact that USB0 is used in firmware to talk to Arduino in DV3 and onwards. PCB that show rev 7 and up will be supported by us. ---
**Author:** ![awneil](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/awneil/32/486_2.png) [@awneil](https://mangoh.discourse.group/u/awneil)\ **Post date:** [June 6, 2016, 7:49pm UTC](https://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92/6 "2016-06-06T19:49:14Z")
But, surely, if ttyUSB0 was being used for the Arduino connection, then plugging in the cable would show up as ttyUSBx where x != 0 ?? If it’s correctly recognised that the device has been plugged in, what would prevent it from being assigned a proper /dev/ttyUSBx identity? If seems to be a Linux issue rather than a hardware issue? ---
**Author:** ![awneil](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/awneil/32/486_2.png) [@awneil](https://mangoh.discourse.group/u/awneil)\ **Post date:** [June 8, 2016, 7:15pm UTC](https://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92/7 "2016-06-08T19:15:35Z")
I got a new mangOH - yes, it does work with the FTDI cable, creates a /dev/ttyUSBx and I can send & receive stuff to the port from the command line. 😁 ---
**Author:** ![asyal](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/asyal/32/78_2.png) [@asyal](https://mangoh.discourse.group/u/asyal)\ **Post date:** [March 6, 2017, 5:20am UTC](https://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92/8 "2017-03-06T05:20:54Z")