OTEK’s model TR530 is an 8-channel input/output controller that accepts up to eight TTL/CMOS/DRY contact inputs. And upon detecting a change of logic state, transmits to the receiver its ID and input channel status. The receiver outputs this data for logging and changes the output channel to match the transmitter’s input. Key features include 1 A SPDT relay output, serial data for each channel, on demand or polling, and serial I/O communications up to 19.2 KB. The unit is suitable for safety/security control and Hi/Lo alarm monitoring. Various case styles are available including a hand-held belt clip transmitter.

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Peak transmitting power for the unit is <1 mW, while the operating frequency is 916.5 MHz. Other specs include a latency of 50 ms, transmitter power consumption of 250 mW, receiver consumption of 250 mW plus 200 mW per relay ON for a maximum of 2 W, and a relay response of 10 ms. Operating temperature range for the unit is –10 °C to 60 °C. While the miniature case accepts 5 and 6-14 Vdc power input, the sanitary and NEMA 4X cases accept 5, 6-14 Vdc and 90-265 Vac.