HD-D-sub 15 pins commonly used for VGA monitors:
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| 15 pin HIGH DENSITY D-SUB female connector | 15 pin HIGH DENSITY D-SUB male connector |
| Pin | Name | Direction | Description |
| 1 | RED | PC-to-monitor | Red Video (75 ohm, 0.7 V p-p) |
| 2 | GREEN | PC-to-monitor | Green Video (75 ohm, 0.7 V p-p) |
| 3 | BLUE | PC-to-monitor | Blue Video (75 ohm, 0.7 V p-p) |
| 4 | ID2 | Monitor-to-PC | Monitor ID Bit 2 |
| 5 | GND | N/A | Ground |
| 6 | RGND | N/A | Red Ground |
| 7 | GGND | N/A | Green Ground |
| 8 | BGND | N/A | Blue Ground |
| 9 | KEY | N/A | Key (No pin) |
| 10 | SGND | N/A | Sync Ground |
| 11 | ID0 | Monitor-to-PC | Monitor ID Bit 0 |
| 12 | ID1 or SDA | Monitor-to-PC | Monitor ID Bit 1 |
| 13 | HSYNC or CSYNC | PC-to-monitor | Horizontal Sync (or Composite Sync) |
| 14 | VSYNC | PC-to-monitor | Vertical Sync |
| 15 | ID3 or SCL | Monitor-to-PC | Monitor ID Bit 3 |