# Sierra Wireless HL78 dev kit hardware not responding

**URL:** <https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104>\
**Category:** Legacy HL Series\
**Created:** [October 5, 2021, 7:41am UTC](https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104 "2021-10-05T07:41:31Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![sridharbe11](https://avatars.discourse-cdn.com/v4/letter/s/5e9695/32.png) [@sridharbe11](https://forum.sierrawireless.com/u/sridharbe11)\
**Post date:** [October 5, 2021, 7:41am UTC](https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104/1 "2021-10-05T07:41:31Z")

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I am new in using the HL78 developmet kit and when i connect to test the AT commands via m-center tool getting as Hardware not responding.Not sure what is problem.

Will be great if someone could help on this.

Regards  
M.Sridhar

 ![Capture](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/3/32f2ef7480b9c426ae950b0da8a970677f948c87.png)

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [October 5, 2021, 8:08am UTC](https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104/2 "2021-10-05T08:08:09Z")

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How about enabling hardware flow control?  
How about using other baud rate?

Is there anything on uart0?

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**Author:** ![sridharbe11](https://avatars.discourse-cdn.com/v4/letter/s/5e9695/32.png) [@sridharbe11](https://forum.sierrawireless.com/u/sridharbe11)\
**Post date:** [October 5, 2021, 8:21am UTC](https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104/3 "2021-10-05T08:21:43Z")

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I tried for different baud rates same behavior,Nothing on Uart ![Capture1](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/d/d2b1f3662cc15314f2670d9481699980d96c480a.png)

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [October 5, 2021, 8:33am UTC](https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104/4 "2021-10-05T08:33:20Z")

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+CGREG are unsolicited message from module, right?

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**Author:** ![sridharbe11](https://avatars.discourse-cdn.com/v4/letter/s/5e9695/32.png) [@sridharbe11](https://forum.sierrawireless.com/u/sridharbe11)\
**Post date:** [October 5, 2021, 8:44am UTC](https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104/5 "2021-10-05T08:44:04Z")

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yes it is from module,but still the status is not responding for any commands

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [October 5, 2021, 8:51am UTC](https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104/6 "2021-10-05T08:51:56Z")

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probably the metal case is not properly covered?

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**Author:** ![sridharbe11](https://avatars.discourse-cdn.com/v4/letter/s/5e9695/32.png) [@sridharbe11](https://forum.sierrawireless.com/u/sridharbe11)\
**Post date:** [October 5, 2021, 8:55am UTC](https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104/7 "2021-10-05T08:55:41Z")

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Anything specifically to be triggered for any of the PIN??

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [October 5, 2021, 8:57am UTC](https://forum.sierrawireless.com/t/sierra-wireless-hl78-dev-kit-hardware-not-responding/25104/8 "2021-10-05T08:57:36Z")

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UART1 TX RX CTX RTS should be related