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Connectors and signals
The connectors on the rear panel of the UCC MMI controller enclosure are shown below:

| Key | Description | Connection |
|---|---|---|
| 1 | Equipotential bonding point | - |
| 2 | 15-way high-density D | |
| 3 | 15-way high-density D | |
| 4 | 15-way high-density D | |
| 5 | PC connection | USB |
| 6 | Not used | - |
| 7 | 9-way D | |
| 8 | Blank | - |
| 9 | Not used | - |
| 10 | Not used | - |
| 11 | Machine I/O | 44-way high-density D |
| 12 | Not used | - |
| 13 | - |