Pentax DSI-200 Series User Manual page 154

"query/command" from the master. For a broadcast message sent
by the master, the slaves need not return a response.
Data Format
The drive supports reading and writing of word-type parameters
only. Reading command is 0x03 and writing command is 0x06. It
does not support reading and writing of bytes or bits.
In theory, host computer can read several consecutive parameters
(n can reach up to 12) but the last parameter it reads must not jump
to the next parameter group. Otherwise, an error occurs on
Response.
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