Wireless LoRa Module with SX1278 Chip and UART Transparent Transmission
DL-RTS1278M is a high-performance wireless serial port LoRa module developed by DreamLnk for wireless meter reading and industrial remote control, it was embedded with high-speed low-power MCU and high-performance spread-spectrum RF chip SX1278, with LoRa spread-spectrum technology, while using efficient cyclic interleaving error correction coding, anti-interference and sensitivity are at the most advanced level in the industry.
This LoRa Module provides multiple channel selections, and can online modify the serial port rate, transceiver frequency, transmit power, RF rate and other parameters. The default frequency is 434.125MHz. The working voltage of this RF module is 2.1-3.6V, and only consumes 13mA in the receiving state.
DL-RTS1278M has four working modes, which can be arbitrarily switched between the modes. In the 1SEC cycle polling wake-up power saving mode (Polling mode), the reception consumes only tens of microamps, a section of lithium at 3.6V / 3.6AH. The sub-battery can work for several years and is very suitable for battery-powered systems.
Features:
● 3000 meters transmission distance (0.81Kbps)
● Working frequency 433MHz, 470MHz, 868MHz, 915MHz optional
● -132dBm = 810bps ultra-high sensitivity
● Maximum 100mW transmit power
● LoRa spread spectrum modulation
● Zero waiting to wake up, with air wake up function
● Efficient cyclic interleaving error correction coding
● Four working modes, standby current 2.5uA
Applications
● Wireless automatic meter reading
● Extremely long distance data communication
● Wireless sensor network
● Industrial automation data collection
● Field data remote control and telemetry
● Various transmitters, flowmeter intelligent instruments
● Building automation and security
● Monitoring and control of mine petroleum equipment
● Environment, energy saving, temperature monitoring
● Intelligent transportation, intelligent power
● Intelligent robot
Technical Parameter
| No | Name | Parameters |
| 1 | Module size | 18.3 * 32.3mm (without antenna) |
| 2 | Device source | All imported components, origin: Japan, the United States, Germany |
| 3 | Production Process | SMT lead-free process, AOI automatic testing, in line with environmental certification standards |
| 4 | Interface method | 1 * 7 * 2.54mm, universal board and Dupont wire can be used |
| 5 | Working frequency | Default 434.125MHz, other frequencies can be customized 470-510MHz, 855-885MHz, 900-930MHz |
| 6 | Frequency step | 1KHz setting step |
| 7 | Modulation | LoRa spread spectrum modulation |
| 8 | Transmit power | 100mW=3.3V (0-7, 8 levels adjustable, each level increases by 3dBm, maximum 100mW |
| 9 | Receive sensitivity | -132dBm=0.81Kbps, -118.5dBm=18.23K bps |
| 10 | Air transmission rate (Occupied bandwidth) | 0.81K / (BW125K), 1.46K / (BW125K), 2.6K / (BW125K) 4.56K / (BW125K), 9.11K / (BW250K), 18.23K / (BW500K) |
| 11 | Interface rate | 1200 – 115200bps |
| 12 | Interface verification method | 8N1 / 8E1 / 8O1 |
| 13 | Interface buffer space | Double 256Bytes |
| 14 | power supply | 2.1 ~ 3.6V |
| 15 | Emitting current (typical value) | 100mA = 100mW |
| 16 | Continuous receiving current | 13mA=4.56Kbps, 15mA=18.23Kbps in reception rate (typical value) |
| 17 | Sleep current | 2.5uA=3.3V (typical value), maximum 4.0uA |
| 18 | Transmission distance | 3000 meters=0.81Kbps, 2000 meters=9.11K bps (open distance visible) |
| 19 | Antenna port impedance | 50 ohm |
| 20 | Operating temperature | -40 ~ + 85 ℃ |
| 21 | Working humidity | 10% ~ 90% relative humidity, no condensation |
The DL-RTS1278M module has 9 pins, the specific definition is as follows:
| Pin | Pin name | Pin direction | Pin usage |
| 1 | GND | - | Ground 0V |
| 2 | VCC | - | 2.1 ~ 3.6V |
| 3 | SET_A | Input (with weak pull-up) | Parameter setting A, pull-up resistor is about 47K |
| 4 | RXD | Input (with weak pull-up) | UART input port, TTL level, pull-up resistor is about 47K |
| 5 | TXD | Output | Output UART output port, TTL level |
| 6 | AUX | Output | Data input and output instructions |
| 7 | SET_B | Input (very weak pull-up) | Parameter setting B, pull-up resistance is about 10M |
| 8 | NC | - | Ground or floating |
| 9 | NC | - | Ground or floating |
