Packet Structure
The HART Packet has the following structure
| Field Name | Length (Bytes) | Purpose |
|---|---|---|
| Preamble | 5-20 | Synchronization and Carrier Detect |
| Start Byte | 1 | Specifies Master Number |
| Address | 1-5 | Specifies slave, Specifies Master and Indicates Burst Mode |
| Command | 1 | Numerical Value for the command to be executed |
| Number of data bytes | 1 | Indicates the size of the Data Field |
| Status | Master (0) Slave (2) | Execution and Health Reply |
| Data | 0-253 | Data associated with the command |
| Checksum | 1 | XOR of all bytes from Start Byte to Last byte of Data |
Read more about this topic: Highway Addressable Remote Transducer Protocol
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