System provides analog and contact inputs with analog and discrete outputs for point to point data acquisition. Model DR9011 wireless transmitter sends analog and contact closure data to companion DR9021, where it is recovered as two 4–20 mA outputs, and switch data is provided by optically isolated NPN transistors outputs. RF choices - 2 in 915 MHz ISM band and 1 in 2.4 GHz band - all use spread spectrum frequency hopping technology. Each RF module has choice of 7 Hop sequences.