NEW PRODUCTS ■ HARDWARE ■ SOFTWARE ■ GADGETS ■ TOOLS
16 March 2017
RF DATA TRANSCEIVER
MODULE
The PW1-928 RF transceiver module available from Lemos International is designed for reliable bidirectional transfer of digital data over distances of over
300 feet in cluttered urban environments (over half a mile
in true line-of-sight). Operating in the 902 to 928 MHz
frequency band, the module generates a nominal + 7 dBm
into a 50 ohm load and achieves an outstanding RX
sensitivity of –112 dBm.
The module uses the industry standard LoRa direct
sequence chirp spreading protocol combined with a
proprietary data structure to both simplify user
implementation and to significantly improve packet
transmission reliability. It has a Universal Asynchronous
Receiver Transmitter (UART) serial interface that can be
directly connected to typical microcontrollers, RS-232
converters, or USB adapters. The module automatically
handles all radio functions resulting in a true UART-to-antenna wireless link. Configuration setup is also accessed
through the UART interface.
The module is designed to interface directly to a host
serial interface (UART). Two lines are used to transfer data
between the module and the host (SI and SO), and there
are two further status outputs (RXS, TXS) that can be used
to generate hardware handshaking signals, or drive visible
indicators. The SO pin is the data output from the module
(sometimes referred to as RXD). SI is the data input
(otherwise TXD).
The UART interface has a fixed format (one start bit,
eight data bits, one stop bit) and operates at baud rates of
9. 6 (default), 38. 4, or 57. 6 kbps. In command
/programming mode, the interface uses a 2. 4 kbps rate.
Two separate 64-byte FIFO buffers are provided for the
serial interface TX and RX paths. Applications include:
• Direct RS-232/485 wire replacement
• Asset tracking
• Automated meter reading
• Industrial/home automation
• Wireless sensors
• Remote data logging
• Fleet management
• Traffic and display signs
• Mass-transit communications
• Oil and gas sensing
• Long range data links
For more information, contact:
Lemos International
Co., Inc.
www.lemosint.com
