Actually you did find a mistake in our datasheet, but the manual is more clear including stickers on the top of the unit.
Anyway, we will fix the datasheet to get everything right and more clear.
Looking at the screenshot you sent, the right order for DMX and RS-232 plug is the RED color numbers.
The right order for GPO is the YELLOW color numbers.
Thank you for pointing up this mistake!
Have fun using your Iocore2.