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It’s a good breakout board. I’d like the through holes for the actual DB9 to be significantly oversized so that you could mount a standard DB9 to it directly.
As it is, I had to solder wires to the DB9’s wire pots and then solder the wires to the breakout board. If the holes were oversized, I could have cut out the middleman and just wired the female DB9 to it directly.