APPENDIX D: DMX512-A Enhanced Functions
DMX512-A supports four different Enhanced Function Topologies, or ways to use the five pins of a 5-pin XLR connector. They include:
| EF# | Symbol (Optional) | Description | Comment |
| 1 | ← → | Half duplex EIA-485-A signals on primary data link; return signals on primary data link controlled by a registered Alternate start Code; no functionality on secondary data link | |
| 2 | ⇆ | Uni-directional DMX512 data on primary data → link (EIA-485-A signals) and return EIA-485-A signals on secondary data link | |
| 3 | ← ← → | Uni-directional DMX512 data on primary data link (EIA-485-A signals) and half duplex EIA-485-A signals on secondary data link Refer to manufacturer's instructions | Refer to manufacturer's instructions |
| 4 | ← →← ... |
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