Moxa's ioPAC 5540 series products are hardy, metal encased all-in-one compact RTU controllers that combine a cellular modem, an I/O controller, and a data logger into a compact device that provides complete communication redundancy with built-in GPRS/HSPA. The product supports standalone data logging in a storage space expandable up to 32 GB, and comes with the innovative, patented Active OPC Server software, based on push technology. Users can expect many significant value-added benefits that include reductions in data transmissions, lower hardware costs, and lower deployment and maintenance costs. In addition, with high sampling rates, a prerecorded event buffer, millisecond scale timestamps, and either C/C++ or IEC 61131-3 programming platforms, I/Os deliver both accuracy and powerful programming tools, giving engineers a strong, efficient platform to support monitoring and analytical processes like identifying anomalous intrusions, or device failures.