HART Commands - Ifea
HART Commands - Ifea
HART Commands - Ifea
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<strong>HART</strong> Digital Data Frames<br />
20 mA-<br />
4 mA-<br />
Command (From Master)<br />
Preamble Start<br />
Character<br />
Response (from Device)<br />
Preamble Start<br />
Character<br />
Device<br />
Address<br />
0-15<br />
Device<br />
Address<br />
0-15<br />
• 4-20 mA is available in real time!<br />
[1]- Command from Master<br />
Command<br />
No.<br />
(0 - 253)<br />
Command<br />
No.<br />
same as CMD<br />
• <strong>HART</strong> Digital Data is CMD/Response (Half-Duplex)<br />
[2]- Device time required to respond……...<br />
[3]- Response from Device<br />
Byte Count in<br />
this transaction<br />
0-25<br />
Byte Count in<br />
this transaction<br />
0-25<br />
Data in<br />
Command<br />
Status<br />
2-bytes<br />
Checksum<br />
Data<br />
in<br />
Reply<br />
12 HONEYWELL September 19, 2012<br />
12<br />
<strong>HART</strong> Device<br />
Read data, Write data, or command Device to perform an action.<br />
Checksum
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