# MangOH Red HL7800 unresponsive autoboot

**URL:** <https://mangoh.discourse.group/t/mangoh-red-hl7800-unresponsive-autoboot/2844>\
**Category:** mangOH Red\
**Created:** [August 15, 2019, 5:33pm UTC](https://mangoh.discourse.group/t/mangoh-red-hl7800-unresponsive-autoboot/2844 "2019-08-15T17:33:10Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![pcborenstein](https://avatars.discourse-cdn.com/v4/letter/p/87869e/32.png) [@pcborenstein](https://mangoh.discourse.group/u/pcborenstein)\
**Post date:** [August 15, 2019, 5:33pm UTC](https://mangoh.discourse.group/t/mangoh-red-hl7800-unresponsive-autoboot/2844/1 "2019-08-15T17:33:10Z")

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I have the HL7800 version of the MangOH red. My serial ports will not work. I see 2 COM ports as described in step 10 of section 3.1 of HL78xx Getting Started Guide. One in the USB port and the other is the IoT card DB9 connection.

The USB console port continuously reads out a message about autoboot. The guide claims this port is not usable. The other COM port connected to the IoT card does nothing.

I could connect to the UART port (UART0) on the IO pins (CN307). This port will echo a few characters right at the beginning of the autoboot sequence. I cannot get any characters to echo through the IoT card (UART1).

I swapped out the provided HL7800 module for another one and I get the same behavior. The DIP switch has pins 1 and 4 ON. All others are off.

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**Author:** ![pcborenstein](https://avatars.discourse-cdn.com/v4/letter/p/87869e/32.png) [@pcborenstein](https://mangoh.discourse.group/u/pcborenstein)\
**Post date:** [August 15, 2019, 6:06pm UTC](https://mangoh.discourse.group/t/mangoh-red-hl7800-unresponsive-autoboot/2844/2 "2019-08-15T18:06:07Z")

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My IoT card is different from the guide’s pictures. My Renfell card says “UART RS232 9W” The guide pictures a “RS232 4W”

I am connecting to the IoT card with a FTDI’s CHIPI-X10 [https://www.digikey.com/product-detail/en/ftdi-future-technology-devices-international-ltd/CHIPI-X10/768-1138-ND/3103022](https://www.digikey.com/product-detail/en/ftdi-future-technology-devices-international-ltd/CHIPI-X10/768-1138-ND/3103022)

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**Author:** ![pcborenstein](https://avatars.discourse-cdn.com/v4/letter/p/87869e/32.png) [@pcborenstein](https://mangoh.discourse.group/u/pcborenstein)\
**Post date:** [August 22, 2019, 8:08pm UTC](https://mangoh.discourse.group/t/mangoh-red-hl7800-unresponsive-autoboot/2844/3 "2019-08-22T20:08:40Z")

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I have received word though other channels that the mangOH Red does not work with the HL7800. This is very disappointing to hear.

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**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:** [August 24, 2019, 10:28am UTC](https://mangoh.discourse.group/t/mangoh-red-hl7800-unresponsive-autoboot/2844/4 "2019-08-24T10:28:28Z")

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Hl7800 is working with mangoh red. We have tested this before releasing the product. Are your sw401 settings matching the hl78 red guide ?

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<div class="post-metadata">

**Author:** ![pcborenstein](https://avatars.discourse-cdn.com/v4/letter/p/87869e/32.png) [@pcborenstein](https://mangoh.discourse.group/u/pcborenstein)\
**Post date:** [August 26, 2019, 12:51pm UTC](https://mangoh.discourse.group/t/mangoh-red-hl7800-unresponsive-autoboot/2844/5 "2019-08-26T12:51:08Z")

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> [@pcborenstein](#):
>
> The DIP switch has pins 1 and 4 ON.

Yes, my sw401 setting matches the guide.