433MHz RS485 Wireless Pair 20dBm

Set of two matched RS485 wireless transceivers. Physical size per unit: 74 × 24 × 16 mm (excluding antenna); construction: blue plastic + metal shell. Power supply: 4.5–5.5 V DC. Interface: RS485 (5V, GND, A+, B−). Frequency coverage: 433–458.5 MHz with 255 channel options. Transmit power: −40 to +20 dBm (10 user-selectable levels); max output 100 mW. Receiver sensitivity: −114 dBm. Transparent serial transmission supports UART rates 1200–19200 bps (default 9600); over-air rate: 10–100 kbps. Onboard MCU enables ID-based addressing and automatic baud synchronisation. Range: up to 500 m line-of-sight. Temperature tolerance: −25 °C to +75 °C. Designed for seamless integration: connect one module to your Modbus temperature sensor, another to your PLC or Raspberry Pi gateway — data flows unchanged. Supports scalable topologies: 2-unit point-to-point links, or ≥3-unit star networks where one acts as master (e.g., central Wiser hub) and others as slaves (e.g., radiator valves, shutter controllers). Hardware-enforced single-transmitter rule ensures bus integrity. Configuration via AT commands (e.g., AT+ENABLE=1) is restricted to first 180 seconds post-power-on — protecting configured systems in commercial deployments like care home nurse call extensions or retail LED display networks. Field-proven across UK applications: wireless RS485 backbone for NIBE heat pump monitoring; extending RS485 runs for remote CCTV PTZ control in heritage sites; connecting DIN-rail mounted RS485 relays to home automation hubs; and enabling LoRa-like long-range telemetry for gas/water meter reading without proprietary gateways.