Ancestors

Toot

Written by poleguy on 2025-01-10 at 23:16

Internal to the #Axient #Digital #PSM Receiver (ADXR) that #Shure just shipped there is, unsurprisingly, a programming header

that exposes #serial, #JTAG, etc. It is in violation of (Murphy's)[https://en.wikipedia.org/wiki/Edward_A._Murphy_Jr.] law.

This stupid cable has the same connector at both ends, but is electrically asymmetrical. It has no key feature and has no obvious polarity marking on the cable.

I will not allow this mistake to

propagate to the new design.

[#]electronics

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Descendants

Written by Daniel Marks on 2025-01-14 at 14:02

@poleguy I usually at the minimum silkscreen the digit 1 on the side where the cable stripe is if I can't key it.

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Written by poleguy on 2025-01-14 at 16:32

@profdc9 The digit 1 is silk screened on the programming board and on the pack. And the physical setup of the connectors makes it very difficult to orient the connectors backwards. However Murphy is more robust than this. The cable itself can be reversed (left vs right in the picture.) The cable is not symmetrical, but does not have a key. It also has no silk screen on it, coloring, or any other indication of polarity. The only clue that it is asymmetric is that the trace on the left is fatter.

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