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Description
Characteristics
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Description
Summary
The HRI-485x series comprises a Data Transfer Unit (DTU) device that facilitates wireless data transmission by converting the RS-485 bus. HRI-4851 enable RS-485 data to be transmitted via LoRa, on the other hand, HRI-4852 connects the data of HRI-4851 to the server via LTE or ETH. This highly dependable DTU device is suitable for deployment in industrial settings and can be mounted directly on rack rails, thus enabling IoT evolution for previous devices. Additionally, the series features an effortless configuration function that allows for the direct management and configuration of options and parameters within the Local Area Network (LAN).
NOTE
HRI-4852 cannot be used standalone, it only serves as a network access tool for HRI-4851.
Main Features
- DC 4.5~28V wide voltage input.
- Rack rails compatible.
- Built in configuration page, without the need for other configuration software, the device can be configured and maintained through the local area network.
- HRI-4851: can be configured as point to point, point to many, or mesh mode.
- HRI-4852: Ethernet, LTE multiple network modes.
- HRI-4852 support TCP, UDP, MQTT.
- Support for data encryption,1024 bytes cache, a single packet supports up to 240 bytes.
- Support communication key function, prevent data interception.
- Operating temperature range: -40 ~ 85 °C.
Specifications
| Parameters | Description |
|---|---|
| MCU | ESP32C3-FN4(HRI-4851) / ESP32DOWDQ6(HRI-4852) |
| LoRa chipset | SX1262 |
| Frequency | 470~490MHz(470M+200K*N) 863~883MHz(863M+200K*N) 902~922MHz(902M+200K*N) N: 0~100 |
| LTE module | Air724UG |
| Rack rail width | 35 mm |
| Max. TX Power | 21±1 dbm |
| Max. Receiving sensitivity | -134dBm |
| Supply voltage | 4.5 ~ 28v |
| Operating temperature | -40 ~ 85℃ |
| Operating humidity | 10%～90%, no-condensing |
| Antenna impedance | 50 Ω |
| Address Code | 0000 ~ FFFF |
| Baud rate | 1200/2400/4800/9600/19200/38400/57600/115200 |
| Buffer | 1024 bytes |
Variance
HRI-4851‘s primary function is to convert the RS485 bus to LoRa wireless signal. Usually works as a node device, P2P control and relayer.
- HRI-4851 supports P2P custom protocol, need work with other HRI-4851 or HRI-4852.
- HRI-485L supports LoRaWAN protocol, need work with a LoRaWAN gateway.
HRI-4852 is a LoRa custom P2P protocol gateway, it transfer LoRa signals from other devices to the cloud server through LTE or Ethernet.
- HRI-4852’s header pins are only used for power supply, it can’t communicate with a RS584 devices.
- HRI-485L is NOT a LoRaWAN gateway, it’s running LoRa custom P2P protocol, only work with HRI-4851 or other Heltec P2P protocol devices.
Hardware Connection
HRI-4851
HRI-4852
Description
Easy config
Power on and connect the terminal
Scan and registration
Configure
For more detailed configuration methods, please refer to the HRI-485x series Quick Start documentation.
FAQ
All HRI-485X series can upgrade firmware via OTA.
No, the WiFi function only used for OTA upgrade.
No. It is usually only used as a tool for HRI-4851 to enter the network.
You can set 10 commands. When multiple commands are set, they are automatically sent 5 seconds apart.
It depends on how long and how often your node goes up and down in a single trip. The shorter the uplink time and the longer the interval, the more devices you can access. For example, if the uplinks and downlinks take 4 seconds at a time and the send cycle is 60 seconds, you can access up to 60/4=15 units. Of course, this is the ideal situation.
Docs & Resource
- [Resource] — HRI-485X series user manual
- [Attachment] — HRI-485X series datasheet
- [Attachment] — HRI-485X application example
- [Resource] — HRI-485X LoRaWAN firmware (The firmware version must correspond to the product model)
Packing list
The default packing list without selecting any accessories is as follows:
| Item | Quantity |
|---|---|
| RS485 Wireless Converter | x1 |
| Glue Rod Antenna | x1 |
Characteristics
| Weight | 90 g |
|---|---|
| Dimensions | 12 × 7 × 3.2 cm |
| Model | HRI-4851(Custom LoRa), HRI-4851+HRI-4852, HRI-4852(HRI-4851 to Server) |
| LoRa Band | 433MHz, 470~510MHz, 863~870MHz, 902~928MHz |
| LTE | N/A, Available for 470MHz |
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RS485-LoRa Wireless Converter
What's this?
HRI-4851 converts 485 bus into LoRa, HRI-4852 connect HRI-4851 to server via ETH or LTE.
Price range: $17.90 through $42.90
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