| IDENTIFIER DESCRIPTION |
| ID (HEX) | TX/RX | Command |
| 3F0 | RX | Read analog channel 1; transmit result (ID = 3f8) |
| 3F1 | RX | Read digital inputs; transmit result (ID = 3f9) |
| 3F2 | RX | Change digital output 1 |
| 3F3 | RX | Change digital output 2 |
| 3F8 | TX | Analog channel 1 value |
| 3F9 | TX | Current values of digital inputs |
| 3FA | TX | Command acknowledgement (for 3F2) |
| 3FB | TX | Command acknowledgement (for 3F3) |
| 3FE | TX | Analog channel 0 value (timed) |
| 3FF | TX | System error |