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jim

Q1 should nog be there

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If used as a master, this board is terrible: pin 2 and 3 of the 485 should then be high, but in stead Q1 is causing DE/ to turn low when you want to send. This results in the inverse line NOT producing any output, except for short peaks at falling edges on the DI.

Simply put: I can't drive my DMX dimmer. After fysical removal of Q1 the board works fine.

IF you really want to use this setup (why?? just put the DE RE/ on a pin!!), the gate of Q1 should be wired to RX, not TX !!

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