蓝牙在工业自动化数据通信中的应用

　　蓝牙在工业自动化数据通信中的应用

　　本文着眼于蓝牙技术在工业自动化应用中的应用，以提供一种可替代的无线数据通信能力。它着眼于与其他无线技术相比的优点，以及如何处理诸如干扰之类的问题。它涵盖了Stellaris蓝牙开发板从德克萨斯仪表以及芯片rn-42，connectblue obs411和RFM的wls1271模块。

　　蓝牙技术虽然被称为移动电话中的数据连接技术，但它非常适合串行、现场总线和工业以太网网络中的自动化设备的无线集成。它并没有使道路成为欧洲工业自动化戏剧性，但使用经验和大批量的生产从移动电话业务，IEEE 802.15.1蓝牙技术可以提供小尺寸，低功耗，和具有成本效益的模块。

　　蓝牙提供了现成的模块，简化了工厂无线数据通信系统的开发，但也有一些关键问题需要考虑。蓝牙技术可以用于这一领域的两种数据网络，从提供灵活的用户界面到机器直接从传感器处理数据到连接有线网络（如现场总线或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.