The DR9031 from Wilkerson Instrument Co., Lakeland, FL, is a wireless transceiver that provides bidirectional analog and contact closure data transmission to a companion DR9031 where the data is recovered. The analog data is recovered as two 4–20 mA outputs and the switch data are provided by optically isolated NPN transistors outputs. Analog inputs available include dual-channel DC voltage or current, single-channel RTD, or strain-gauge bridge inputs. The bridge version provides 10 VDC excitation for up to four 330 ohm bridges. For the single-channel inputs, the two 4–20 mA outputs are proportional to the single input. Features include a choice of 3 radio frequencies (2 in the 915 MHz ISM band and 1 in the 2.4 GHz band), FHSS operation, and a choice of 7 hop sequences.
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