ELPRO 505U
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The 505U has an internal radio transmitter which operates on unlicensed radio channels in the UHF band. A radio licence is not required for the 505U in most countries and has an operating range of several kilometres. It is suitable for use in utility industries such as electricity, water and gas; and because of its low price, it is also a cost effective solution for short range applications in factories and plants.
Mode of Operation
The 505U transmits the value of the input signal whenever the signal changes, and after a pre-configured time. Each transmission message includes error-checking to confirm the validity of the message. At each transmission, the 505U may
be configured to repeat the transmission several times to ensure that the transmission is received correctly. The input signal is then output either as an identical signal or across a serial data link (RS232 or RS485).
Extremely Low Power Consumption
The power consumption of the 505U is very small as it conserves power by reverting to ”sleep” mode between transmissions. The 505U can be powered from an external 12 VDC supply, or it may be optionally fitted with internal AA batteries which will power the unit for more than four years. The 505U unit provides an internal alarm on low battery voltage - this alarm may be transmitted by radio.