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Radiometrix 公司的TXL2和RXL2模块是9600波特多路OEM无线调制解调器,工作频率为欧洲的433MHz ISM频段,提供单向无线电毗连方案. TXL2/RXL2与EN 300 220-3 和EN 301 489-3 兼容,具有高质量稳定的基准晶体和低噪音合成器/VCO,以及SAW前端滤波器和多级陶瓷IF滤波,发送功率+10dBm,吸收敏捷度-107dBm,主要应用在手持终端,PDA,工业远程信息处理,修建物内情况检测和控制,远程数据收罗系统,舰艇,汽车数据收罗等.本文先容了TXL2和RXL2主要特点,指标和方框架图,以及和MCU直接毗连框架图, 通过RS232线路驱动器/吸收器毗连到RS232端口框架图. 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. 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 TXL2/RXL2主要特点: 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 TXL2/RXL2主要技能指标: 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应用: Handheld / portable terminals PDAs, organisers & laptops Industrial telemetry and telecommand In-building environmental monitoring and control Remote data acquisition system, data logging Fleet management, vehicle data acquisition |
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