| Tx Data | Size | Description |
| 'D' | byte | |
| 'D' | byte | |
| select | byte | designated channels; ‘1’ at bit position selects the channel |
| select | byte | b0 = channel1,…,b7 = channel8; all ‘0’ = timing |
| address | word | defined as offset from memory start as: (pulse number)*2-2 |
| data | word | amplitude or pulse-width |
| undefined length (at least 8 bytes) |