HART中的Burst-Mode(突發模式)


突發模式是高速的數據傳輸模式,其模式通常有幾個數據源。在數據總線中,突發模式通常變為專為滿足一個設備的通道。

 

輔助材料1:

Burst-Mode is optional for a HART products but is strongly recommended.

HART Burst-Mode supports the publishing of cyclical process data using "Burst" messaging. In this mode, a device is instructed to publish the response to a command continuously without any further Master or Host action.

If a Field Device supports Burst-Mode then all of Commands 103-105 and Commands 107-109 must be implemented. Furthermore, devices implementing Burst-Mode must support at least 3 Burst Messages. Existing, legacy Field Devices updated from HART 5 are allowed to support only one Burst Message.

 

輔助材料2:(https://www.crifan.com/comparation_among_hart5_hart6_hart7/

HART7相對於HART5(和HART6)的功能上,主要增加了:

(1)Enhanced Burst Mode

增強的突發傳送模式

更適用於高速的無線(wireless)傳輸,因為其速度是250Kbit/s,而相對有線的(wired)傳輸速度是1.2kbit/s。

所以,對於有線的,雙線回路(two-wired loop)來說,因其必須工作在小於4mA的環境下,更推薦使用HART5的查詢(Polling)模式用於診斷信息(diagnositics)。

而對於4-20mA的設備來說,HART5,也已經夠用了。


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