Digital communications
Data Communications and Networking
Data Communications and Networking
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Building management system (BMS) are used to control and improve indoor building climate at reduced costs. By integrating BMS with wireless sensor networks, the need for cabling can be removed, and both installation and operational costs significantly reduced. Furthermore, temporary BMS installations are made possible By implementing and evaluating the open BMS standard such as BACnet,EIB/KNX,etc on the wireless sensor nodes we show that using existing standard protocols is possible on resource-constrained sensor nodes.in this paper we present the design of a protocol and hardware for a wireless communication system.this protocol is implemented in reconfigurable logic devices and has a modular structure that admits a fast easy adaptation to different commercial transdeivers.applying this protocol it is possible to transmit the information using different free frequency bands depending on the speed, distance an consumption requirements of the application in use.this protocol follows the master-slave model according with the retransmission policy of a stop and wait protocol. it has been implemented in reconfigurable logic devices and this implementations have been tested with wireless transceivers in 868 MHz frequency bands it has also been developed a test board to estimate which are the best system parameters (speed, distance, data size, etc) for each application.