The following are the Supervisory Frame Types in HDLC
| RR | Information frame acknowledgement and indication to receive more. |
| REJ | Request for retransmission of all frames after a given sequence number |
| RNR | Indicates a state of temporary occupation of station (e.g. window full) |
| SREJ | Request for retransmission of one given frame sequence number. |
The following are the Unnumbered Frame Types in HDLC
| DISC | Request disconnection |
| UA | Acknowledgement frame |
| DM | Response to DISC indicating disconnected mode. |
| FRMR | Frame reject. |
| SABM | Initiator for asynchronous balanced mode. No master/slave relationship |
| SABME | SABM in extended mode. |
| SARM | Initiator for asynchronous response mode. Semi master/slave relationship |
| SARME | SAMR in extended mode. |
| REST | Reset sequence numbers. |
| CMDR | Command reject. |
| SNRM | Initiator for normal response mode. Full master/slave relationship |
| SNRME | SNRM in extended mode. |
| RD | Request disconnect |
| RIM | Secondary station request for initialization after disconnection. |
| SIM | Set initialization mode. |
| UP | Unnumbered poll. |
| UI | Unnumbered information. Sends state information/data. |
| XID | Identification exchange command. |
There is one information Frame Type in HDLC
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