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433MHz Rf DTU Wireless RS485 Transceiver LoRa SX1278 Uhf Module rf Transmitter Receiver
DTU introductions
LS-LR-DTU30 is a 433MHz,1W industrial-grade wireless data transmission unit with high stability. The DTU uses SX1278 main chip, LORA spread spectrum transmission, RS232/485 level output. The DTU adopts the efficient cyclic interleaving error correction coding algorithm, which has high coding efficiency and good error correction ability. In the case of sudden interference, the DTU can correct the interrupted data packets, and the maximum continuous error correction is 64bit, which greatly improves the DTU’s Anti-jamming ability and transmission distance, and in the absence of error correction algorithm, this error packet can only be discarded. Using LORA spread spectrum technology makes the module have a longer communication distance.
LS-LR-DTU30 has two kinds of operation modes and can be switched when needed. Transparent transmission mode is use for data transparent transmission. Configuration mode is use for changing the communication parameters of the DTU.
LS-LR-DTU30 operating frequency is 410MHz ~ 441MHz, a total of 32 channels, each channel’s interval is 1M.
Electrical Parameter:
| No. | Item | Parameter details | Description |
| 1 | Size | 82 * 62 *25mm | Without antenna |
| 2 | Weight | 133g | Without antenna |
| 3 | Frequency band | Default: 433MHz | 410~441MHz channel: 32, 433±5MHz (recommended ) |
| 4 | Housing | Aluminum alloy | Black |
| 5 | Connector | RS485:1*4*3.81mm RS232:DB9 | Screwing Standard DB9, hole |
| 6 | Supply voltage | 8 ~ 28V DC | Note: the voltage higher than 28V is forbidden |
| 7 | Communication level | RS232/RS485 | Available for RS232 and RS485 |
| 8 | Operation range | 3000m | Test condition: clear and open area & 20dBm, antenna gain: 5dBi, height:> 2m, air data rate: 2.4kbps |
| 9 | Transmitting power | Maximum 30dBm | About 1W, can be configured to 20, 17, 14, 10dBm |
| 10 | Receiving sensitivity | -130dBm/2.4kbps | Sensitivity has nothing to do with baud rate and timing |
| 11 | Air data rate | 2.4kbps | Can be configured to 0.3, 1.2, 2.4, 4.8, 9.6, 19.2kbps |
| 12 | Standby current | 14mA | Mode 3(power supply: 12V) |
| 13 | Transmitting current | 126mA/20dBm | >300mA (recommended) |
| 14 | Receiving current | 28mA | 12V |
| 15 | Communication interface | RS232/RS485 | 8N1, 8E1, 8O1 Eight kinds of UART baud Rate, from 1200 to 115200 bps (default: 9600) |
| 16 | Driving mode | RS232/RS485 | Can be configured to push-pull/high pull, open-drain |
| 17 | Transmitting length | 512 bytes buffer | 58 bytes per package |
| 18 | Receiving length | 512 bytes buffer | 58 bytes per package |
| 19 | Address | 65536 configurable addresses | Easy for network, broadcast and fixed transmission |
| 20 | RSSI support | Built-in intelligent processing | - |
| 21 | Antenna type | SMA-K | External thread hole |
| 22 | Operating temperature | -40 ~ +85℃ | Industrial grade |
| 23 | Operating humidity | 10% ~ 90% | Relative humidity, no condensation |
| 24 | Storage temperature | -40 ~ +125℃ | Industrial grade
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DTU factory setting
| DTU type number | working frequency (MHZ) | ID address (HEX) | Factory channel | Air rate (Kbps) | Serial port rate (Bps) | Serial port format | Transmitting power (mW) |
| LS-LR-DTU30 | 433.00 | 0x1234 | 23channel | 2.4 | 9600 | 8N1 | 1000 |
Working modes
The module has two operating modes, which can be observed by RESET indicator, details are shown in the following table:
| modes(0-1) | RESET indicator light | Mode introduction | Remarks |
| 0 transparent transmitting mode | off | Serial port open, wireless open, transparent transmission | The receiver must be in mode 0 |
1 configuration mode | on | DTU parameters can be configured | For more details please see the working parameters |
