EasyRadio Transceiver Module Datasheet - AVRcard

LPRS Data SheetEasy -Radio ER900TS Transmitter, ER900RS Receiver & ER900TRS TransceiverNotesRSSI OutputThe Receiver/Transceiver has a built in RSSI (Received Signal Strength Indicator) that provides an analogueoutput voltage that is inversely proportional to the RF energy present within the pass band of the receiver. Itranges from 0 Volt (maximum signal, –50dBm) to 1.2 Volts (minimum signal, -105bBm) and has a slope ofapproximately 50dB/Volt. This analogue output signal should only be connected to a high impedance load(>100k Ohms) and can be used to provide a measure of the signal strength and any interfering signals(noise) within band during the installation and operation of systems.433MHzVoltage1.31.21.10.9 10.80.70.60.50.40.30.20.10-105 -100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50dBmFigure 10 RSSI OutputApplication NotesMAX232 ApplicationAntenna+5VVO7805GNDVIVin = 8-12V DC1N4148ANT1RF GND2RSSI 3BUSY 4DATA OUT5DATA IN6HOST RDY7VCC 8GND 912345678C1+V+C1-C2+C2-V-T2OUTR2INVCC 16GND 15T1OUT14R1IN 13R1OUT 12T1IN11T2IN10R2OUT 9MAX232100n100n100n162738495PC ATDCDDSRRXDRTSTXDCTSDTRRIGNDArticle I.0 Volt100nHost Ready Tied LowFigure 11 MAX232 Application CircuitCompatibilityThe ER900TS, ER900RS & ER900TRS use crystal controlled synthesisers to accurately define transmit andreceive frequencies incorporating RS232 protocols, and so should not be used in connection with Non-EasyRadio RF modules.Encoding/DecodingEasy-Radio technology allows the transport of simple encoder/decoder code formats or more sophisticatedschemes. Please contact sales/applications for further technical advice.Easy-Radio ER900TS, ER900RS & ER900TRS 1-1.doc Copyright LPRS 2003. March2004 Page 13 of 15