Wireless modem module SLR-434M

interface moduleRS232FSK

Overview
The SLR-434M is a compact embedded radio modem operating in the 434 MHz ISM band. It supports conventional FSK communication and LoRa® modulation for very long range operation at low bit rates. With high receiving sensitivity, low RF output power operation can achieve ranges of up to a few kilometers or more in line-of-sight conditions. The module connects to an external CPU or PC via a UART (RS232) interface and supports a simple command protocol for industrial applications. The module can process up to 8 switching signals for telemetry and telecontrol applications.

Features

• RED compliant (EN 300 220)
• Very long range operation using LoRa® mode
• Switchable between FSK and LoRa® modes
• UART interface (COM port, RS232)
• Simple command protocol for user program development
• Transmission of up to 8 switching signals via I/O terminals
• Compact dimensions and low power consumption
• Improved resistance to urban RF noise compared to conventional FSK

Applications

• Sensor and telemetry data transmission in buildings and industrial sites
• Mudslide and debris-flow monitoring at control dams
• River level and dam monitoring
• Greenhouse temperature and humidity monitoring and control
• Sensor data relay from underground installations or manholes
• Tunnel and bridge condition monitoring
• Landslide and slope-stability warning systems

Specifications (excerpt)

• Model: SLR-434M
• Frequency range: 433.0750–434.7750 MHz
• Channels: 137 (12.5 kHz step)
• RF output power: < 10 mW (SMA contact, nominal)
• RF bit rates: 15–245 bps (LoRa), 4800 bps (FSK)
• Receiver sensitivity: < -133 dBm (LoRa 128-chip); < -115 dBm (FSK)
• Supply voltage: 3.3–5.5 V (3.5–5.0 V recommended)
• Supply current: TX 29 mA typ.; RX 17 mA typ. (@5 V)
• Dimensions (W×D×H): 40 × 29 × 6.2 mm (excl. antenna connector)
• Modulation: LoRa or 2-FSK (selectable)
• I/O: 8 digital I/O for switching signals
• UART: RS232C, 19,200 bps, RTS/CTS hardware flow control

UART Interface (excerpt)

• Communication method: Serial communication (RS232C)
• Synchronization: Asynchronous / UART
• UART bitrate: 19,200 bps
• Flow control: Hardware RTS/CTS; software Xon/Xoff not used
• Other parameters: Data length 8 bits, no parity, 1 (or 2) stop bits

Trademark
LoRa® is a trademark of Semtech Corporation.