| Command | Description |
| ACU | Enable/Disable automatic updating of ZY state to client |
| BYE | Disconnect from ZY |
| ENTEMP | Returns the temperature of the ZY enclosure |
| GTI | Get ZY Time |
| INI | Create cube objects |
| INITZY | Initialize the ZY program |
| PS | Read/set the state of the ZY's power supplies |
| QQQ | Terminate the ZY program |
| RDF | Read a file on the ZY's disk |
| REPEAT | Schedules another command for future execution |
| RST | Reset the ZY computer |
| STI | Set ZY Time |
| STS | Return ZY status string |
| STW | Return ZY status word (32 bit) |
| TN | Track node (for target tracking - EXPERIMENTAL) |
| TR | Track update rate (for target tracking - EXPERIMENTAL) |
| TS | Track start (for target tracking - EXPERIMENTAL) |
| TSP | Track starting position (for target tracking - EXPERIMENTAL) |
| VER | Returns the ZY version number |
| ZPNAME | Sets/returns the name of the ZP unit associated with this ZY |
| XON | Communication handshaking (OK to send more data) |
| XOFF | Communication handshaking (Stop sending data) |