Function: 1. HRI-485_ 1: ESP32-C3 main control chip, default function: LoRa RS485 2. HRI-485_ 2: ESP32 main control chip, default function: LoRa; Ethernet (note: this product does not support RS485) 3. HRI-485_ 3: ESP32 main control chip, default function: (Ethernet RS485) Main control chip: ESP32-C3FN4/ESP32DOWDQ6 LoRa chip: For SX1262 Maximum transmission power: 21 1dBm Maximum receiving sensitivity: -139dBm Power supply voltage: DC 4.5-28V Working temperature: -40~85 Rail width: 35mm LORA protocol: Private protocol, supporting data encryption Frequency: 470-490MHz (470M+200K * N) 863-883MHz (863M+200K * N) 902-922MHz (902M+200K * N) N: 0-100 Working humidity: 10%~90%, non condensing Antenna impedance: 50 Address code: 0000~FFFF Baud: 1200/2400/4800/9600/19200/38400/57600/115200 Storage: 1024 bytes Instructions for use: Describe some application modes of HRI-485X without considering protocols: 1. Overall: 4851 can achieve multiple networking modes, but can only work within the local area network. To access , 4852 is required; Generally speaking, 4852 only serves as the gateway for 4851 to access ; After 4853 is connected to a machine, it can be used separately (without LoRa function). 2. How to access : Both 4852 and 4853 have two access modes, 4G or Ethernet (router). There is often a misconception here, which is the "4851Gateway mode". It can only be used as a gateway for the local area network, managing devices in the "4851Node" mode below, and cannot directly access the internet. This is different from Heltec's previous gateway products, please note. 3. The LTE function can only be used in the 470MHz band of Chinese Mainland at present, and other regions do not support this function temporarily. Color: White Material: plastic Package Contents: 1X converter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.