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Msi b850 lab assembly guide#1194

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JakubSobota wants to merge 4 commits intomasterfrom
MSI_B850_Guide
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Msi b850 lab assembly guide#1194
JakubSobota wants to merge 4 commits intomasterfrom
MSI_B850_Guide

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@JakubSobota
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@JakubSobota JakubSobota requested a review from macpijan December 15, 2025 14:52
@macpijan macpijan requested a review from mkopec December 17, 2025 08:19
@BeataZdunczyk BeataZdunczyk requested review from miczyg1 and removed request for macpijan and mkopec January 22, 2026 10:52
Comment on lines 40 to 47
1. Connect the RTE J18 header to the platform JBD1 header as described in the
table:

| RTE | MSI PRO B850 |
|:---------------:|:-----------------------:|
| J18 pin 1 (GND) | JCOM1 pin 5 |
| J18 pin 2 (RX) | JCOM1 pin 3 |
| J18 pin 3 (TX) | JCOM1 pin 2 |
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JCOM1 header on this board uses RS232 signal levels (i.e. 12V), it cannot be directly connected to the CMOS/TTL signal levels present on RTE pins. One has to use IDC to DB9 adapter and DB9 null modem cable to connect to DB9 connector on RTE.

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@JakubSobota JakubSobota Feb 23, 2026

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@miczyg1 That's true, I didn't check it properly during assembly, the changes were applied.

1. Connect the RTE rs232 header to the platform JBD1 header using IDC to DB9 adapter
and DB9 null modem cable.

* Sonoff S20 type E
* 7x standard female-female connection wire 2.54 mm raster
* 7x standard female-female connection wire 2.54/2.00 mm raster

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  • DB9 null moderm cable
  • IDC 9-pin to DB9 adapter

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@miczyg1 I updated the table

* 1x DB9 null modem cable
* 1x IDC 9-pin to DB9 adapter


### Serial connection

1. Attach the jumpers in the RTE J16 header to enable header J18:
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Jumper position should be on RS232

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@miczyg1 This has been corrected

1. Attach the jumpers in the RTE J16 header to enable header RS232:
| Jumper position (TX) | Jumper position (RX) |
|:-------------------------:|:-------------------------------:|
| RS232 + COM | RS232 + COM |

### Power supply controlling

Power supply controlling (in this case: controlling the state of Sonoff)
should be performed based on the `sonoff.sh` script implemented in `meta-rte`
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This script might not exist? I can't find it in meta-rte

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@m-iwanicki This section was copied from older assembly guide, it seems that this script does not exist in this OS version, so the section has been removed.

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3 participants