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I would guess your problem is therefore that the signals are inverted. With no segments in the data you get them all turned on instead of turned off. This is probably to do with the drive waveform to the original LEDs being active low.
If it's a problem, just invert the data in software before writing it out to the TX port.
Brian.
If it's a problem, just invert the data in software before writing it out to the TX port.
Brian.