| Code | Description | Comment | Version |
| ER | Command cannot be completed because of error condition | See response parameters. | added v2.4 |
| OK | Command completed successfully | | added v2.4 |
| ST | Command cannot be completed because of the status of the requested equipment | | added v2.4 |
| TI | Command cannot be completed within requested completion time | | added v2.4 |
| UN | Command cannot be completed for unknown reasons | | added v2.4 |