DataNab LLC, Burnsville, MN, offers the Ui28_PC2 and Ui16_R5 Modbus I/O modules for networkable and stand-alone monitoring and control applications for building management. The Ui28_PC2 has 28 inputs, 2 high-speed 32-bit pulse counters, and lets you monitor temperature, humidity, current, and other status points for building automation, energy management, and other applications. The Ui16_R5 has 16 inputs and 5 output relays, with a NO and NC contact for each relay. The output relays can be used to turn lights on and off, activate or deactivate alarms, or control the HVAC system. Both modules work with 12–24 V AC or DC power supplies and are compact and rail-mountable.