For commercial and residential systems, the Ui28_PC2 and Ui16_R5 Modbus I/O modules suit networkable and standalone monitoring and control applications. Ui28_PC2 features 28 universal inputs and two high-speed pulse counters while the Ui16_R5 provides 16 universal inputs and five relay outputs. Both are compact, rail-mountable, and capable of working with 12 to 24 Vac/dc power supplies to maximize ease of use. DataNab LLC, Burnsville, MN. (888) 732-8262.