In this kind of industry application CMC-99 collects all analog measurements and sends them through Modbus RTU to main PLC. The distance between CMC-99 and a PLC installation can be up to 1000 m. All measurements are sent using one cable, this is a very cost effective method. Modbus RTU is very popular and reliable communication protocol. There is a possibility to divide Modbus network into several subnets. CMC-99 can work as a Master in one subnet and as a Slave in another.