Microtek CX4 - Manual (Page 55)

Computer In and Monitor Connector Pin Assignments
The connectors of the Computer In are video RGB 15-pin micro D-type
connectors. The pin assignments for both connectors are as below:
Input Pin Signal
1 Red Signal Input
2 Green Signal Input
3 Blue Signal Input
4 No function
5 GND
6 Red
GND
7 Green GND
8 Blue GND
9 No function
10 Sync GND
11 No function
12 SDA
13
Horizontal Sync input
14 Vertical sync input
15 SCL
Some older graphic subsystems and boards may cause problems when they
are used together with DDC monitors.
Avoid compatibility claims for these systems and boards.
Clearly label monitors that are only suitable for DDC compatible graphic
subsystems and boards.
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