4.0Command Block Format
The controlling device and the
| Data |
| Checksum | ||||
| Count |
| |||||
(MSD) |
| (LSD) |
|
|
| (MAX) |
|
|
|
|
|
|
|
| |
1 | Byte | 1 Byte | 1 Byte |
| 1 Byte | 1 Byte |
•
•
•
•CHECKSUM
Indicates the function and direction of the command:
0System Control (Controller
1Return for 0, 2, or 4 of
2Transport Control (Controller
4Preset/Select Control (Controller
6Sense Request (Controller
7Sense Returned
E
DATA COUNT
Indicates the number of bytes (maximum 15) inserted between
Designates the command
(refer to the Command Table for definitions)
Data that corresponds to those indicated by the command (refer to the Command Table for data formats)
CHECKSUM
Lower eight bits of the sum of the bytes in the command block
Communications Protocol
The controlling device initiates the communication.
• NAK + Error Data | : undefined command or communications error |
• COMMAND + Data | : received a command that requests data |
• ACK | : received a command that requests no data |
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