I have read the D100 and D180 manuals and I see that the pins 4&5 are for the DSAB on the 25 pin connector, and when you see the table showing pins 34,35,36 & 37 it says DO NOT CONNECT.
This I can see as OK as the D180 gets a DSAB connection on pins 4&5 and does not need the 34-37 like a D120...