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Hi Peter, If the manual says that it is 5V tolerant then it is fine but if you already have 3.3V level FTDI then that will be better. The primary reason for lower voltage level is that it take less time to reach 3.3V then it takes to reach 5V, hence 3.3V can work faster. The technology to read logic 3.3V has only been achievable recently (10 years)
So it is better to run on the complaint voltage if only just to make sure.
EQ5 and 6 were made before 3.3V logic became mainstream so it wouldn't have been the best to change half way through production. This is good engineering practice. Anyway I hope managed to get as much out of this thread but it appears you only need to connect GND, TXD and RXD only.
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