20dBm 433MHz RS485 Wireless Transceiver

Unit dimensions: 74 × 24 × 16 mm (excludes antenna); powered by 4.5–5.5 V DC. RS485 interface provides industrial-grade differential signalling (A+, B−) with 5 V logic supply and ground — compatible with Modbus, DALI, and proprietary serial protocols. Frequency range: 433–458.5 MHz, compliant with UK/EU SRD regulations; 255 channels available for interference mitigation. Transmit power: adjustable from −40 dBm to +20 dBm (100 mW) in 10 calibrated increments. Receiver sensitivity: −114 dBm — verified per ETSI test methods. Air data rate: 10–100 kbps, automatically scaled to selected UART speed (1200 / 2400 / 4800 / 9600 / 19200 bps). Payload capacity: 31 bytes per RF packet. Integrated MCU performs serial buffering, channel management, and ID-based routing. AT configuration mode activated only within first 3 minutes via AT+ENABLE=1; no AT parsing occurs thereafter — enhancing operational stability. Rated ambient operating temperature: −25 °C to +75 °C. Enclosure: flame-retardant plastic with embedded metal shielding for improved RF isolation and EMC resilience. Two units form an immediate wireless RS485 link — ideal for bridging gaps between control rooms and field devices. Three or more units operate in master-slave arrangement: master addresses individual slaves by ID, slaves acknowledge or respond — replicating wired RS485 multidrop timing, turnaround delays, and fail-safe bus idle detection. Deployed across regulated and commercial sectors: wireless control of ONVIF-compliant IP PTZ cameras in UK school campuses and retail parks; wireless Modbus sensor networks monitoring boiler efficiency in social housing estates; RS485-based LED video walls and architectural lighting in museums and transport hubs; remote relay control for EV charging station load management; telemetry from gas meters in rural villages; home automation integrations using OpenHAB or Home Assistant via RS485 USB adapters; wireless door entry systems in office blocks; and SMETS2-compliant smart electricity meter communication modules — all benefiting from dependable, standards-aligned 433 MHz wireless serial transport.