Keyboard, Mouse and other input devices cables and adapters scheme
Pin
Name
Pin
Number
Direction Pin
Number
Pin
Name
Description
VGA 1 <-- 3 B Blue
VGA 2 <-- 2 G Green
VGA 3 <-- 1 R Red
VGA 4 <-- 13 H sync Horizontal synchronization
VGA 5 --> 11 ID 0 Monitor ID 0
VGA 6 --> 15 ID 3 Monitor ID 3
VGA 7 --- 10 Sync GND Synchronization ground
RS-232 8 <-- 2 RXD Receive data
PS/2 KB 9 <--> 1 data Keyboard data
PS/2 Mouse 10 <-- 4 Vcc Mouse +5V DC
PS/2 Mouse 11 <-- 5 CLK Mouse clock signal
PS/2 Mouse 12 <--> 1 data Mouse data
PS/2 KB 13 <-- 4 Vcc Keyboard +5V DC
VGA 14 --- 8 B GND Blue ground
VGA 15 --- 7 G GND Green ground
VGA 16 --- 6 R GND Red ground
VGA 17 <-- 14 V sync Vertical synchronization
VGA 18 --> 4 ID 2 Monitor ID 2
VGA 19 --> 12 ID 1 Monitor ID 1
VGA 20 --- 5 GND VGA ground
PS/2 KB 21 --- 3 GND Keyboard ground
PS/2 KB 22 <-- 5 CLK Keyboard clock signal
RS-232 23 --> 3 TXD Transmit data
RS-232 24 --> 7 RTS Request to Send
PS/2 Mouse 25 --- 3 GND Mouse ground

The DSUB-25F connector leads to various other connectors such as: PS/2 Mouse (Male) PS/2 Keyboard (Male) DSUB-15 VGA Graphics (Male) DSUB-9 RS-232 (Female) Connector 2's pinouts are the same from the connectors - PS2 Mouse, Keyboard, VGA, RS232 Serial

25 pin D-SUB female connector layout
25 pin D-SUB female connector
25 pin D-SUB female connector layout
25 pin D-SUB female connector
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Black Box Servselect KVM switch cable visual pinout:
Black Box Servselect KVM switch cable diagram
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