2pcs Rs485 433mhz 20dbm Wireless Transceiver Transmitter Receiver Vhf/uhf Radio Modem

# VHF/UHF Radio Modem RS485 Wireless Transceiver 20DBM 433mhz Transmitter and Receiver## Basic ParametersWorking voltage: 4.5V-5.5VInterface: RS485(5V GND A+ B-)Frequency: 433MHzTransmit power: -40~+20dBmReceiver sensitivity: -114dBmOperating temperature: -25 Celsius~+75 CelsiusTransparent transmission mode rate: 1200, 2400, 4800, 9600(Default), 19200Open ground transmission distance: 500MSize(without antenna): 74 x 24 x 16mmColour: blueMaterial: Plastic + Metal## Features1. Long-distance wireless transmission, up to 500m in open area, 10kbps over-the-air rate2. Operating frequency range 433-458.5MHz, up to 255 communication channels. Maximum 100mW (20dBm) transmit power, 10 levels of power adjustable3. Built-in MCU, communicates with external devices via serial port, sends 31 bytes per transmission4. Supports one-to-one and one-to-many transparent transmission communication through ID setting. Adjusting the serial port rate will synchronously change the over-the-air data transmission rate, adjustable between 10kbps-100kbps5. Equipped with 3-minute configuration window. The module can send and receive data normally within 3 minutes after power-on. Send AT command "AT+ENABLE=1" to make the module enter AT state for parameter setting, this is the only reserved command within the 3-minute window. After 3 minutes, the module cannot enter AT mode and only supports data transmission and reception, "AT+ENABLE=1" will be transmitted as normal data with no reserved commands available## UsageRecommend to use 2 or more units1. For 2 units: Module 1 and Module 2 transmit data to each other2. For 3 or more units: One unit acts as master device, the rest act as slave devices. The working mode is the same as wired RS485 bus. When the master device transmits data, all slave devices receive the data. When any slave device transmits data, the master device and other slave devices can receive the data. Only one device (master or slave) is allowed to transmit data at any time## Compatible Devicescompatible with IP PTZ Cameracompatible with Modbus temperature sensorcompatible with LED Controllercompatible with R4D3C32 RS485 Relaycompatible with N4D8B08 RS485 Relaycompatible with N4D8C12 RS485 Relaycompatible with remote control and remote measurement systemcompatible with wireless metercompatible with Home Automationcompatible with Wiser Homecompatible with access control systemcompatible with smart meter## Package Contents2 * 433M-458M VHF/UHF Radio Modem RS485 transceiver with shell