MSR3

Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com 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. 15th September 2009 Features ! ! ! ! ! ! ! Figure 1: MSR3-868-5 receiver 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 Applications ! ! ! ! ! ! ! ! ! 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 page 1 TBA Figure 2: MSR3 block diagram Radiometrix Ltd, MSR3 Data Sheet page 2 TBA Figure 3: MSR3 Footprint (Top) view Pin Description - MSR3 Pin 1 2 3 4 5 6 7 8 9 Notes: 1. 2. 3. 4. 5. 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 logic level inverted RS232 data stream when used for programming A version of the LMR2 firmware is used, so most variants of the LM_series will also be possible for the MSR3 Two pinout versions are offered: With conventional pins, out of the bottom of the unit With right-angle pins, to allow 'SIL' vertical mounting The actual pinout and footprint follows the NRX1/2 type radio, with the addition of P0-P3 Name RSSI 0V Vcc AF out RXD P0/PGM P1 P2 P3 Function 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 Radiometrix Ltd, MSR3 Data Sheet page 3 Received Signal Strength Indicator 2.5 2.3 2.1 1.9 RSSI output (V) 1.7 1.5 1.3 1.1 0.9 0.7 0.5 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 RF Level (dBm) Figure 4: RSSI voltage variation with respect to RF level at MSR3 If the microcontroller has a built-in Analogue to Digital Converter (ADC), the Received Signal Strength Indicator (RSSI) output voltage level can be read by the microcontroller to estimate its distance from transmitting MSR3 unit or identify areas of weak signal reception. RSSI can also be used to make a decision to switch to the second antenna in fixed installations within building where the probability of null-spots are higher. Radiometrix Ltd, MSR3 Data Sheet page 4 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 program it. 2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control GOCHAN aa Serial select of channel aa (0 to 31) LOAD aa nnnnn Set value of N for channel aa (channels 0 to 31) SETPAR Channel selected by 4 bit parallel input (0 to 15) SETSER Channel selected by most recent 'gochan' operation RVALUE rrrr Enter value for R register SINGLE nnnnn Set value of N for single channel operation. N value NOT stored in eeprom Process entry / Clear all buffers # Disable command mode aa = a two digit channel number from 00 to 31 nnnnn = synthesizer N register value, (up to 65535) rrrr = synthesizer R register value, (up to 16383) R= f Xtal f channelspacing = 13MHz , So R=520 25kHz N= f RF − IF f Channelspacing = 868 MHz − 45 MHz = 32920 25kHz Notes: 1. When If an N value greater than 65536 is needed then an offset of +65536 can be selected by setting bit 15 of the R value high 2. A pause of at least 50ms must be allowed between command strings (EEPROM programming time) SINGLE mode does not store the N value in EEPROM. Therefore the unit is inoperative after a power down until either another valid SINGLE command is received, or mode is changed by a GOCHAN, SETPAR or SETSER command. SINGLE mode is intended for frequency agile applications. 3. /SETPAR command should be issued at the end of channel programming to put the module back into parallel frequency select mode 4. User can modify the frequency table of 32channels to any desired frequency by changing N, R values of synthesizer within ±1.5MHz of factory set Channel 0 frequency subject to the Radio Regulatory Band Allocation in the country of intended use. Radiometrix Ltd, MSR3 Data Sheet page 5 Condensed specifications Frequency Frequency stability Channel spacing Number of channels Supply voltage Current 868 – 870MHz (any 3MHz band from 860 - 870MHz) +/- 1.5kHz 25kHz 32 channels controlled via RS232 interface (16 parallel selected) 4.5 - 15V 25mA -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 9pin 0.1" pitch molex 2pin 0.1" pitch molex 1.2mm (min.) ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3 -118dBm for 12 dB SINAD -90dB -65dB Tested per. ETSI 300-220 v 1.3.1 -60dB (or better) Compliant with ETSI 300-220-3 and EN 301 489-3 RSSI, carrier detect, audio, data 28ms 50ms ο ο Operating temperature Size Spurious radiations Interface user RF Recommended PCB hole size Intended approval Receive Sensitivity blocking adjacent channel image / spurious Spurious radiations Outputs Power on to valid audio Power on to stable data out (50:50 mark / space) Radiometrix Ltd, MSR3 Data Sheet page 6 Appendix CEPT/ERC Rec 70-03, 868 MHz Band Plan Alarm Non-specific SRD Alarm Social Alarm Alarm Applications 25kHz or WB No Spacing 25kHz