23 lines
1.0 KiB
Markdown
23 lines
1.0 KiB
Markdown
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title = "Getting uninverted SBUS/SmartPort on the FrSky XSR receiver"
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weight = 2
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sort_by = "weight"
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insert_anchor_links = "right"
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To get uninverted SBUS/SmartPort on the FrSky XSR/X4RS receiver, you can repurpose the CPPM pad.
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Remove the two small resistors shown in the image, and solder the two lower pads (together) to either the CPPM pad or the MOSFET pin shown in the photo:
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[](../../resources/f86da9a7aac1413ebd77825897164f7f.jpeg)
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They should be soldered like this (remember to solder both resistor pads together):
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[](../../resources/815576429ece43789dbc70dfd33517a1.jpeg)
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Now the CPPM pad will be uninverted SBUS/SmartPort instead.
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It seems to be a bit of a gamble whether you get SBUS or SmartPort, it might be firmware-dependent.
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On firmware 2.1.0 FPort, I actually got the uninverted FPort signal on the CPPM pin, which is what I wanted.
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* * *
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*Last updated on November 24, 2020.*
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