TXL2

EW N Issue 1, 30 April 2007 Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 TXL2/RXL2 UHF UHF Multi Channel Transparent Data Link TX/RX TX/RX The TXL2 and RXL2 modules are 9600baud simplex multi channel OEM radio modems in a Radiometrix SIL standard footprint, operating on European 433MHz ISM band. The TXL2/RXL2 pair act as a transparent serial cable to attached host. Unlike raw FM radio modules (e.g. TX2A/RX2A), TXL2/RXL2 will take care of preamble, synchronisation, bit balancing and error checking along with automatic noise squelching. Figure 1: RXL2-433-9 radio modem receiver The TXL2/RXL2 pair provides a one-way radio link. Provided no two devices attempt to transmit simultaneously no further restrictions on data transmission need be made, as all transmit timing, valid data identification and datastream buffering is conducted by the units. Synchronisation and framing words in the packet prevent the receiver outputting garbage in the absence of wanted RF signal or presence of interference. For multiple radio systems a TXL2/RXL2 can be set to 1 of 8 unique addresses. As well as having unique addresses, the TXL2/RXL2 allow operation on one of 5 pre-set frequencies in the 433MHz band. These frequencies are non-overlapping and simultaneous operation of TXL2/RXL2 pairs in the same area on different channels will be possible. Units are supplied on 433.925MHz (Ch0) as default. Features • • • • • • • • • Conforms to EN 300 220-3 and EN 301 489-3 High quality, stable crystal reference Low noise synthesiser / VCO SAW front-end filter Multi-stage ceramic IF filtering Single conversion superhet Serial modem baud rate at 9600bps (simplex) Addressable point-to-point 5 serial select wideband channels Applications • • • • • • PDAs, organisers & laptops Handheld / portable terminals EPOS equipment, barcode scanners In-building environmental monitoring and control Remote data acquisition system, data logging Fleet management, vehicle data acquisition Technical Summary • • • • • • • • Operating frequency: 433.925MHz (default) Modulation: 16kbps bi-phase FSK Supply: 5V at 28mA transmit, 22mA receive/idle Transmit power: +10dBm (10mW) Receiver sensitivity: -107dBm (for 1% BER) 32 byte data buffer Adjacent channel rejection: 60db @ ±320kHz Receiver Blocking: >75dB TXL2/RXL2 Data Sheet page 1 Radiometrix Ltd Radiometrix Ltd TXL2/RXL2 Data Sheet Figure 2: TXL2 block diagram page 2 42mm 7mm 18mm TXL2 15.24mm (0.6") 1 2 3 4 5 6 7 0.3" 8 8 holes of 0.7mm dia. pin spacing 2.54mm (0.1") 1 = RF gnd 2 = RF out 3 = RF gnd 4 = En 5 = Vcc 6 = GND 7 = TXD 8 = SETUP Figure 3: TXL2 footprint TXL2 Pin description Pin 1 2 3 4 5 6 7 8 Notes: 1. 2. 3. 4. 5. 6. 7. Name RF GND RF out RF GND EN Vcc GND TXD TEST/SETUP Function RF ground 50Ω RF output to the antenna RF ground Pull high to enable module (may be tied to Vcc) 5V regulated power supply (4.75 – 5.25V) Supply ground Inverted RS232 input (5V CMOS logic, No pullup) Pull low to enter test/setup mode (5V CMOS logic, Pullup to 5V) TEST has 47K pullup to Vcc. TXD has none. EN has a 47K pulldown Vcc must be a 5v regulated supply (4.75 - 5.25v) Pinout is similar to TX1H, with the addition of pin 8 (located 7.62mm on from pin 7) TXD is inverted RS232 at 5v cmos levels. To connect to a true RS232 device, inverting a level shifter must be used (MAX232 type are ideal, but simple NPN transistor switches with pullups often suffice). With typical microcontrollers and uarts, direct connection is possible. The TXL2 provides transmit side of a simplex link, but provided no two devices attempt to transmit at one time, no further restrictions on data transmission need be made, as all transmit timing, valid data identification and datastream buffering is conducted by the unit. There is no 'transmit enable' pin. This unit is compatible with the RXL2 receiver and the TDL2A transceiver A simple addressing structure is included in the datastream. Units may be programmed onto one of eight addresses (all units are supplied set to default ADDR=0 and default channel=0, 433.925MHz) Radiometrix Ltd TXL2/RXL2 Data Sheet page 3 Radiometrix Ltd TXL2/RXL2 Data Sheet Figure 4: RXL2 block diagram page 4 47mm 7mm 17mm RXL2 30.48mm (1.2") 1 2 3 4 5 6 7 7 holes of 0.7mm dia pin spacing 2.54mm (0.1") 1 = RF in 2 = RF gnd 3 = RSSI/BUSY 4 = 0V 5 = Vcc 6 = AF/PGM 7 = RXD Figure 5: RXL2 footprint RXL2 Pin description Pin 1 2 3 4 5 6 7 Name RF in RF GND RSSI/BUSY 0V Vcc AF/PGM RXD Function 50Ω RF input from the antenna RF ground S meter or BUSY output Supply ground 5V regulated power supply (4.75 – 5.25V) Baseband audio (or PGM in) Receive Data (Inverted RS232 at 5V CMOS logic level); Input in PGM mode Notes: 1. To enter program mode, the AF/PGM pin must be tied to ground (Vpin below 0.3v: jumper or open collector recommended). Normally this pin functions as a high impedence (20K) receiver baseband audio output 2. Vcc must be a 5v regulated supply (4.75 - 5.25v) 3. Pinout is as RX2A 4. RXD is inverted RS232 at 5v cmos levels. To connect to a true RS232 device, inverting level shifters must be used (MAX232 type are ideal, but simple NPN transistor switches with pullups often suffice). With typical microcontrollers and uarts, direct connection is possible. The same pin is uesd for normal operation Data out, PGM mode data in, and PGM mode data out. 5. The RXL2 provides a receive side of a simplex link. Provided no two devices attempt to transmit at one time, no further restrictions on data transmission need be made, as all transmit timing, valid data identification and datastream buffering is conducted by the unit. 6. This unit is compatible with the TXL2 transmitter and the TDL2A transceiver. 7. A simple addressing structure is included in the datastream. Units may be programmed onto one of eight addresses (all units are supplied set to default addr=0) and one of five RF channels (supplied default is channel=0, 433.925MHz) 8. RSSI pin can be changed to a 'BUSY' (= valid data in FIFO) logic output by a solder blob link on the back of the pcb, otherwise it functions as a signal strength output (0 - 1.4v) Radiometrix Ltd TXL2/RXL2 Data Sheet page 5 Condensed specifications Frequency 433.925MHz – CHAN0 (default channel) 433.285MHz – CHAN1 433.605MHz – CHAN2 434.245MHz – CHAN3 434.565MHz – CHAN4 ±10kHz 320kHz 1 of 5, user programmed 5V 25mA transmit, 8mA idle (EN active / high, no activity on TXD) 22mA receive/idle -20 °C to +70 °C (Storage -30 °C to +70 °C) Compliant with ETSI EN 300 220-3 and EN 301 489-3 0.1" pitch SIL pins TXL2: 43 x 19 x 7 mm RXL2: 47 x 17 x 7 mm Frequency stability Channel width Number of channels Supply Voltage Current TXL2: RXL2: Operating temperature Spurious radiations Interfaces Size TXL2 Transmitter Output power TX on switching time Modulation type FM peak deviation Adjacent channel TX power TX spurious RXL2 Receiver Sensitivity image spurious / adjacent channel Blocking LO re-radiation Interface Data rate Format Levels Buffers Flow control Addressing Data latency 10dBm (10mW) ±1dB