When the DMX standard was created it required a 5 pin XLR but 4 and 5 remained unused. Starting in 2004 the two pins have a function, a second DMX universe.
All versions of DMX512 state that the second pair, Pins 4 and 5 of the 5-Pin XLR connector, are defined as:
PIN 4 - Optional Second Data Link Complement (Data 2 -)
PIN 5 - Optional Second Data Link True (Data 2 +)
Source: http://www.usitt.org/DMXBehindtheRevision.aspx
All versions of DMX512 state that the second pair, Pins 4 and 5 of the 5-Pin XLR connector, are defined as:
PIN 4 - Optional Second Data Link Complement (Data 2 -)
PIN 5 - Optional Second Data Link True (Data 2 +)
Source: http://www.usitt.org/DMXBehindtheRevision.aspx
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