# Device not detected **URL:** \ **Category:** GPRS/GPS Tracker HAT\ **Created:** [October 21, 2020, 5:34pm UTC](https://community.sixfab.com/t/device-not-detected/834 "2020-10-21T17:34:59Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![asismorodo](https://community.sixfab.com/letter_avatar_proxy/v4/letter/a/ac91a4/32.png) [@asismorodo](https://community.sixfab.com/u/asismorodo)\ **Post date:** [October 21, 2020, 5:34pm UTC](https://community.sixfab.com/t/device-not-detected/834/1 "2020-10-21T17:34:59Z")
I setup the HAT installed the software per the getting started manual but dont see ttyS0 or ttyUSB3 connected. Needless to say the ppp connection fails as the device in not showing up. No sings of it either in dmesg. Any ideas? ---
**Author:** ![ensar](https://community.sixfab.com/user_avatar/community.sixfab.com/ensar/32/8_2.png) [@ensar](https://community.sixfab.com/u/ensar)\ **Post date:** [October 21, 2020, 7:21pm UTC](https://community.sixfab.com/t/device-not-detected/834/2 "2020-10-21T19:21:56Z")
Hi @asismorodo, Make sure your module is powered up. It can be turned on by pushing the **PWRKEY** button for at least 500ms. ---
**Author:** ![asismorodo](https://community.sixfab.com/letter_avatar_proxy/v4/letter/a/ac91a4/32.png) [@asismorodo](https://community.sixfab.com/u/asismorodo)\ **Post date:** [October 21, 2020, 8:36pm UTC](https://community.sixfab.com/t/device-not-detected/834/3 "2020-10-21T20:36:26Z")
The HAT has power and is turned on, PWR, STAT and NETL are either on of flashing. ---
**Author:** ![ensar](https://community.sixfab.com/user_avatar/community.sixfab.com/ensar/32/8_2.png) [@ensar](https://community.sixfab.com/u/ensar)\ **Post date:** [October 22, 2020, 8:41am UTC](https://community.sixfab.com/t/device-not-detected/834/4 "2020-10-22T08:41:17Z")
Send the `ATI` command from the serial port on your system. `ATI` is the AT command to get the product identification information. First, enable serial using raspi-config: 1. Start raspi-config: `sudo raspi-config`. 2. Select option **5 - interfacing options**. 3. Select option **P6 - serial**. 4. At the prompt Would you like a login shell to be accessible over serial? answer **‘No’**. 5. At the prompt Would you like the serial port hardware to be enabled? answer **‘Yes’**. 6. Exit raspi-config and **reboot** the Pi for changes to take effect. > **[Sending AT Commands](https://docs.sixfab.com/page/sending-at-commands)** > > Minicom is a text-based serial port communications program. You can send AT commands to Sixfab shield/HAT using minicom. ---
**Author:** ![asismorodo](https://community.sixfab.com/letter_avatar_proxy/v4/letter/a/ac91a4/32.png) [@asismorodo](https://community.sixfab.com/u/asismorodo)\ **Post date:** [October 22, 2020, 9:13am UTC](https://community.sixfab.com/t/device-not-detected/834/5 "2020-10-22T09:13:15Z")
No luck. Thanks fo the guide, I had the serial interface deactivated, enabled via raspi-config but still there is no device listed as ttyS0 or ttyUSB3 so I cannot access the device via minicom. ---
**Author:** ![ensar](https://community.sixfab.com/user_avatar/community.sixfab.com/ensar/32/8_2.png) [@ensar](https://community.sixfab.com/u/ensar)\ **Post date:** [October 23, 2020, 8:34am UTC](https://community.sixfab.com/t/device-not-detected/834/6 "2020-10-23T08:34:06Z")
Which is the raspberry pi model you have? If you are using an older RPI model, you must use the port name **ttyAMA0** instead of **ttyS0**. Also, the Tracker HAT does not have a USB port. Therefore **ttyUSB3** is not listed. ---
**Author:** ![asismorodo](https://community.sixfab.com/letter_avatar_proxy/v4/letter/a/ac91a4/32.png) [@asismorodo](https://community.sixfab.com/u/asismorodo)\ **Post date:** [October 23, 2020, 8:44am UTC](https://community.sixfab.com/t/device-not-detected/834/7 "2020-10-23T08:44:08Z")
Model 2 B. Device is mapped as /dev/ttyAMA0, I can succesfully communicate with it. thank you