Dell UltraSharp U2421HE User Manual page 18

Pin Assignments
DP port (in)
Pin number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
18 | About Your Monitor
20-pin side of the connected signal cable
ML3(n)
GND
ML3(p)
ML2(n)
GND
ML2(p)
ML1(n)
GND
ML1(p)
ML0(n)
GND
ML0(p)
CONFIG1
CONFIG2
AUX CH (p)
GND
AUX CH (n)
Hot Plug Detect
Return
DP_PWR