MSR3
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MSR3 NBFM Multi-channel receiver for 868MHz SRD band The MSR3 is a 25kHz channel narrowband receiver intended for European 868MHz band Non-Specific SRD applications. The module offers a low power, reliable data link in an industry-standard pin out and footprint. Conforms to EN 300 220-3 and EN 301 489-3 High performance double superhet, PLL Synthesizer with TCXO Data rates up to 5 kbps for standard module Fully screened Feature-rich interface (RSSI, analogue and digital baseband) User configurable via RS232 interface Low power requirements Social alarm Handheld terminals Heavy vehicle/machine remote controls EPOS equipment, barcode scanners Data loggers Industrial telemetry and telecommand In-building environmental monitoring and control High-end security and fire alarms Vehicle data up/download Technical Summary ! ! ! ! ! ! ! ! Operating frequency: 868 - 870MHz Custom variants on any 3MHz block from 860 to 870MHz Up to 32 channels Supply range: 4.5V - 15V Current consumption: 25mA receive Data bit rate: 5kbps max. (standard module) Receiver sensitivity: -118dBm (for 12 dB SINAD) Size: 57 x 28 x 9mm Radiometrix Ltd, MSR3 Data Sheet

Figure 2: MSR3 block diagram Radiometrix Ltd, MSR3 Data Sheet

Function 50Ω RF input from antenna RF ground, internally connected to the module screen and pin 2 (0V) DC level between 0.5v and 2.5v. 60dB dynamic range Ground Supply input 4.5 - 15v 700mV p-p audio. DC coupled, approx 1v bias Open collector output of data slicer suitable for Biphase codes Parallel Channel select LSB 1 Serial frequency programming / configuration Parallel Channel select Parallel Channel select Parallel Channel select MSB There is no pullup on the open collector RXD output. P0-P3 are inverted parallel frequency select inputs. They have 10K pullups to 4.4v P0 requires a...

MSR3 serial configuration commands Serial data is sent to the unit on one of the parallel channel select pins (P0). It is very important that the unit does not 'decode' switch bounce in ordinary operation as a command string, or spurious re-writing of the e2prom will result. For this reason the user must send the 16-character string ENABLESERIALMODE (followed by a carriage return) to fully enable the serial command mode before sending any of the command strings listed below. Command mode is disabled on power down, or on reception of a # character. You must power the unit to successfully...

Condensed specifications Frequency Frequency stability Channel spacing Number of channels 868 – 870MHz (any 3MHz band from 860 - 870MHz) +/- 1.5kHz 25kHz 32 channels controlled via RS232 interface (16 parallel selected) voltage Current Operating temperature Size Spurious radiations -20 to +55 C (Storage -30 to +70 C) 57 x 28 x 9 mm Compliant with ETSI EN 300 220-3 and EN 301 489-3 Interface user RF Recommended PCB hole size 9pin 0.1" pitch molex 2pin 0.1" pitch molex 1.2mm (min.) Intended approval ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3 Receive Sensitivity blocking...

Received Signal Strength Indicator The MSR3 has wide range RSSI that measures the strength of an incoming signal over a range of 60dB or more. This allows assessment of link quality and available margin and is useful when performing range tests. The output on pin 1 of the module has a standing DC bias of up to 0.5V with no signal, rising to 2.5V at maximum indication (RF input levels of -40dBm and above). ∆Vmin-max is typically 2V and is largely independent of standing bias variations. RF Level (dBm) Figure 4: RSSI voltage variation with respect to RF level at MSR3 Radiometrix Ltd, MSR3...

Radiometrix Ltd, MSR3 Data Sheet Duty Cycle Channel Spacing Social Alarm Alarm CEPT/ERC Rec 70-03, 868 MHz Band Plan

Radiometrix Ltd Hartcran House 231 Kenton Lane Harrow, Middlesex HA3 8RP ENGLAND Tel: +44 (0) 20 8909 9595 Fax: +44 (0) 20 8909 2233 sales@radiometrix.com www.radiometrix.com Copyright notice This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in part must give clear acknowledgement to the copyright owner. Limitation of liability The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of...