| Value | Description |
| 0 | not used |
| 1 | periodic, cyclic per/cyc |
| 2 | background scan3 back |
| 3 | spontaneous spont |
| 4 | initialized init |
| 5 | request or requested req |
| 6 | activation act |
| 7 | activation confirmation actcon |
| 8 | deactivation deact |
| 9 | deactivation confirmation deactcon |
| 10 | activation termination actterm |
| 11 | return information caused by a remote command retrem |
| 12 | return information caused by a local command retloc |
| 13 | file transfer file |
| 14..19 | reserved for further compatible definitions |
| 20 | interrogated by station interrogation inrogen |
| 21 | interrogated by group 1 interrogation inro1 |
| 22 | interrogated by group 2 interrogation inro2 |
| 23 | interrogated by group 3 interrogation inro3 |
| 24 | interrogated by group 4 interrogation inro4 |
| 25 | interrogated by group 5 interrogation inro5 |
| 26 | interrogated by group 6 interrogation inro6 |
| 27 | interrogated by group 7 interrogation inro7 |
| 28 | interrogated by group 8 interrogation inro8 |
| 29 | interrogated by group 9 interrogation inro9 |
| 30 | interrogated by group 10 interrogation inro10 |
| 31 | interrogated by group 11 interrogation inro11 |
| 32 | interrogated by group 12 interrogation inro12 |
| 33 | interrogated by group 13 interrogation inro13 |
| 34 | interrogated by group 14 interrogation inro14 |
| 35 | interrogated by group 15 interrogation inro15 |
| 36 | interrogated by group 16 interrogation inro16 |
| 37 | requested by general counter request reqcogen |
| 38 | requested by group 1 counter request reqco1 |
| 39 | requested by group 2 counter request reqco2 |
| 40 | requested by group 3 counter request reqco3 |
| 41 | requested by group 4 counter request reqco4 |
| 42..43 | reserved for further compatible definitions |
| 44 | unknown type identification |
| 45 | unknown cause of transmission |
| 46 | unknown common address of ASDU |
| 47 | unknown information object address |
| 48..63 | for special use (private range) |
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