SMX2-433-5

EW N Issue 1, 28 August 2007 Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 SMX2 Small MultiSmall Multi-channel UHF Transceiver Standard: Variant: SMX2-433-5 (10mW) SMX2-XXX-5 (2mW-25mW) SMX2 is small multi-channel UHF transceiver operating on 433.05MHz434.79MHz European licence exempt band. SMX2 offers a fast-route to custom frequency on any UHF band from 431MHz to 436MHz with 25kHz channel spacing. Features ! ! ! ! ! ! ! ! ! Conforms to ETSI EN 300 220-3 and EN 301 489-3 High performance double superhet, 128 channel PLL synthesizer Data rates up to 5 kbps for standard module Usable range over 500m Fully screened. Low profile Feature-rich interface (RSSI, analogue and digital baseband) Incorporate a 1200baud dumb modem Re-programmable via RS232 interface Low power requirements Figure 1: SMX2-433-5 Applications ! ! ! ! ! ! ! ! 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: 433.05 - 434.79MHz Custom variants from 431 - 436MHz on any 1MHz band 128 channels controlled via RS232 interface Transmit power: +10dBm (10mW) nominal. Adjustable 2 – 25mW Supply range: 4.2V - 15V Current consumption: 30mA (10mW) transmit, 25mA receive Data bit rate: 5kbps max. (standard module) Receiver sensitivity: -120dBm (for 12 dB SINAD) Size: 53 x 32 x 12mm Radiometrix Ltd SMX2 Data Sheet page 1 Radiometrix Ltd SMX2 Data Sheet Figure 2: SMX2 block diagram page 2 Figure 3: SMX2 footprint (Top) view Pin Description Pin 1a 2a 3a 4a 5a 6a 7a 8a 1b 2b 3b 4b Name RSSI Vcc TXD AF out RXD TXE PGM 0V 0V S0 S1 S2 Function DC level between 0.5V and 2.5V. 60dB dynamic range DC supply input. (4.2 – 15V at 50mA max.) DC coupled input for TTL/ CMOS logic. 500mV p-p audio. DC coupled, approx 0.8V bias. Open collector output of data slicer. Need external pull-up Transmit enable. Low = RX mode. High = TX. (10kΩ pull down) Serial programming / control input (true RS232) Ground Ground Parallel channel select LSB Parallel channel select Parallel channel select MSB Pin description of SMX2 with Modem mode selected The 'modem' mentioned is a 1200 baud RS232 semi-intelligent unit (Transmit keyed when valid serial data is present, so no separate TX control needed. Coding in the datastream also permits the receiver to ignore noise and only output valid serial data) This is a half duplex unit, so collisions between transmitted and received packets must be dealt with by the user (if transmit data is sent to the unit then a transmit burst commences immediately and the contents of the receive data buffer is lost) Pin 1a 2a 3a 4a 5a 6a 7a 8a 1b 2b 3b 4b NOTES: 1. 2. 3. 4. No inversion occurs between TXD and RXD. However AF out is inverted relative to TXD. Parallel channel selects are active LOW and have internal pullups to 4V There are no pullups on the open collector outputs. The software incorporates a 1200 baud modem, compatible with that implemented in other Radiometrix narrowband units ( i1200 tones and format ). Modem operation is selected by the SETMOD command. TXE pin (6a) becomes an RS232 input, and RS232 compatible data is output on the RXD pin (5a). If true +/- levels are desired then an inverter and a MAX232 should be used on data out. SMX2 Data Sheet page 3 Name RSSI Vcc NC NC MOD RXD MOD TXD PGM 0V 0V S0 S1 S2 Function DC level between 0.5V and 2.5V. 60dB dynamic range DC supply input. (4.2 – 15V at 50mA max.) Leave unconnected Leave unconnected Open collector RS232 compatible data output RS232 data input Serial programming/control input (true RS232) Ground Ground Parallel channel select LSB Parallel channel select Parallel channel select MSB Radiometrix Ltd 5. RS232 input pins (6a and 7a) tolerate true +/- levels. No buffering is required. 6. If analogue transmit modulation is needed, then connect a series 1µF cap + 500kΩ trimmer in the ‘baseband in’ circuit. Adjust trimmer for 90% of peak deviation (+/- 2.7KHz) at mean input level. 7. If parallel channel select is not wanted, the 4 pin connector 'b' can be removed SMX2 serial interface commands 2400 baud at RS232 level. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control. Transmit (pin 3 on DB9) and Signal Ground (pin 5 on DB9) should be connected to PGM and 0V respectively. SINGLE GOCHAN LOADMX LOAD aa LOADTB RVALUE SETPAR SETSER SETMOD / nnnnn xx xx nnnnn nnnnn rrrr Set value of N for single channel operation (value not stored in eeprom) Serial select of channel xx (0 to 127) Set highest permitted (serial selected) channel xx (others default to ch0) Set value of N for channel aa (channels 0 to 15) Set value of N for channel 16 (channels 17 to 127 then in sequence) Enter value for R register Channel selected by 3 bit parallel input (0 to 7). Also disables modem Channel selected by most recent 'gochan' operation Enable internal modem. Frequency selected by most recent 'gochan' or 'single' Process entry Clear all buffers xx = channel number from 00 to 127 aa = two digit channel number from 00 to 15 nnnnn = synthesizer N register value, (up to 65535) rrrr = synthesizer R register value, (up to 16383) N= f RF f Channelspacing = 433.05MHz = 17322 25kHz R= f Xtal f channelspacing = 13MHz , So R=520 25kHz Notes: 1. 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. 2. /SETPAR command should be issued at the end of channel programming to put the module back into parallel frequency select mode Radiometrix Ltd SMX2 Data Sheet page 4 Condensed specifications Frequency Frequency stability Channel spacing Number of channels 433.05 - 434.79MHz (Any 1MHz band from 431 - 436MHz) ±2kHz 25kHz (12.5kHz by special order) 128 channels selected via serial RS232 interface 8 channels parallel selected (via 3 frequency select pins) in 433MHz band only 69 channels are used as standard 4.2V-15V 30mA @ 10mW transmit [ 25mW version @ 45mA] 25mA receive (or modem ‘idle’) -10 to +60 C (Storage -30 to +70 C) 53 x 32 x 12 mm Compliant with ETSI EN 300 220-3 and EN 301 489-3 8 pin 0.1" pitch molex 4 pin 0.1" pitch molex 3 pin 0.1" pitch molex 1.2mm (min.) Supply voltage Current Operating temperature Size Spurious radiations Interface user Power RF Recommended PCB hole size Transmitter Output power TX on switching time Modulation type TX modulation bandwidth Deviation Adjacent channel TX power TX spurii Inputs Receiver Sensitivity image / spurious blocking adjacent channel Outputs Power on to valid audio Power on to stable data out +10dBm(10mW) ± 1dB (factory adjustable: 2 - 25mW)