藍牙在工業(yè)自動化數(shù)據(jù)通信中的應用

　　本文著眼于藍牙技術(shù)在工業(yè)自動化應用中的應用，以提供一種可替代的無線數(shù)據(jù)通信能力。它著眼于與其他無線技術(shù)相比的優(yōu)點，以及如何處理諸如干擾之類的問題。它涵蓋了Stellaris藍牙開發(fā)板從德克薩斯儀表以及芯片rn-42，connectblue obs411和RFM的wls1271模塊。

　　藍牙技術(shù)雖然被稱為移動電話中的數(shù)據(jù)連接技術(shù)，但它非常適合串行、現(xiàn)場總線和工業(yè)以太網(wǎng)網(wǎng)絡中的自動化設備的無線集成。它并沒有使道路成為歐洲工業(yè)自動化戲劇性，但使用經(jīng)驗和大批量的生產(chǎn)從移動電話業(yè)務，IEEE 802.15.1藍牙技術(shù)可以提供小尺寸，低功耗，和具有成本效益的模塊。

　　藍牙提供了現(xiàn)成的模塊，簡化了工廠無線數(shù)據(jù)通信系統(tǒng)的開發(fā)，但也有一些關(guān)鍵問題需要考慮。藍牙技術(shù)可以用于這一領(lǐng)域的兩種數(shù)據(jù)網(wǎng)絡，從提供靈活的用戶界面到機器直接從傳感器處理數(shù)據(jù)到連接有線網(wǎng)絡（如現(xiàn)場總線或HART）。

　　For non-mission-critical designs， Bluetooth is increasingly being used to access a built-in user interface based on WEB and WAP technology， mainly for maintenance and configuration. The point-to-point nature of the link is well suited to particular applications such as on a sensor node that is periodically providing data from equipment. This is particularly useful in hard-to-reach areas where the sensor can provide key data on the health of the equipment and flag problems before they become critical.

　　For the more mission-critical applications， the radio link reliability is key for deterministic behavior and real-time performance. Here， the important issues are the data rates， latency and interference with other Bluetooth nodes， other radio standards such as 802.15.4 ZigBee， and 802.11g and b Wi-Fi， which both operate in the 2.4 GHz band. Other radiating sources like certain types of machinery and microwave ovens operating at 2.4 GHz can also affect the performance of the Bluetooth link.

　　Another issue is communication error detection and automatic correction. The Bluetooth protocol includes key elements to make this as robust as possible while keeping down the cost and power consumption.