public enum HdlcOperation| SetNormalResponseMode | 0 | Set normal response mode. |
| Disconnect | 1 | Disconnect. |
| ConfirmedDataTransfer | 2 | Data transfer using numbered data frames (I-frames). |
| Test | 3 | Test |
| BroadcastDataTransfer | 4 | Data transfer using unnumbered data frames (UI-frames). No poll bit is set. |