Main instrument unit control module, Trionic T7
See Figure.
PIN SPECIFICATION
| Number of pins | K12 | PCS | 12 |
| K20 | PCS | 20 | |
| Power supply (+30 circuit) | Pin No. | 7 (K12) | |
| Power supply (+15 circuit) | Pin No. | 1 and 6 (K12) | |
| Signal ground | Pin No. | 2 and 3 (K12) | |
| I bus | + | Pin No. | 5 (K12) |
| - | Pin No. | 12 (K12) | |
| P bus | + | Pin No. | 4 (K12) |
| - | Pin No. | 11 (K12) |