Modbus is a serial communications protocol originally published by Modicon (now Schneider Electric) for use with its programmable logic controllers (PLCs). Simple and robust, it has since become a de facto standard communication protocol, and it is now a commonly available means of connecting industrial electronic devices. The main reasons for the use of Modbus in the industrial environment are:- developed with industrial applications in mind- openly published and royalty-free- easy to deploy and maintain- moves raw bits or words without placing many restrictions on vendors. The development and update of Modbus protocols have been managed by the Modbus Organization since April 2004, when Schneider Electric transferred rights to that organization, signaling a clear commitment to openness. Before creating the bOS configuration, configure the Modbus device according to the manufacturer's instructions or contact your installer to get a configuration report (list of Modbus addresses).