Implementing an Efficient Lightweight Modbus Protocol over a Wireless Sensor Network.

This paper focuses on the implementation of a modified lightweight version of the MODBUS protocol optimized for wireless sensor networks. Here, the master and slave arrangement is made wireless using low cost and multi-featured RF modules (nRF24L01P). The modified MODBUS Packet Data Unit is sent in the data frame of the nRF24L01P. As part of the implementation in this paper the nRF24L01P's feature of “Enhanced ShockBurst” is utilized for auto acknowledgement of the received data which increases the system reliability. Also, a power saving feature is embedded in the slave modules to reduce the overall power consumption. A practical approach is taken to measure the total battery life of the device and the overall speed of the system.