| Tx Data | Size | Description |
| 'Z' | byte | ASCII character, capital ‘i’ |
| 'Z' | byte | |
| select | byte | designated channels; ‘1’ at bit position selects the channel |
| select | byte | b0 = channel1,…,b7 = channel8; all ‘0’ = timing |
| start address | word | inclusive, defined as offset (see ’D’ cmd) |
| pulse count | word | |
| total length of the command: 8 bytes |