The GPIB Multiline Interface Messages can return the following message codes.
| Mnemonic | Definition |
|---|---|
| DCL | Device Clear |
| GET | Group Execute Trigger |
| GTL | Go To Local |
| LLO | Local Lockout |
| MLA | My Listen Address |
| MSA | My Secondary Address |
| MTA | My Talk Address |
| PPC | Parallel Poll Configure |
| PPD | Parallel Poll Disable |
| PPE | Parallel Poll Enable |
| PPU | Parallel Poll Unconfigure |
| SDC | Selected Device Clear |
| SPD | Serial Poll Disable |
| SPE | Serial Poll Enable |
| TCT | Take Control |
| UNL | Unlisten |
| UNT | Untalk |