Summary of Contents for Cansec DTU LR A
- Page 1 DTU_LR_A Instructions DTU_LR_A Instructions V1.0 Beijing Jia An Electronics Technology Co,.Ltd. Beijing Jia An Electronics Technology Co,.Ltd.
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Page 2: Table Of Contents
DTU_LR_A Instructions Catalogue 1.Brief introduction ............................... 3 1.1 Parameter ................................ 4 1.2. Interface description ............................ 4 1.3. Indicator light .............................. 5 1.4. Appearance size ............................... 6 2.Application scenario .............................. 7 2.1 LoRa DTU Application scenario ........................ 7 2.2 LoRa DTU + 4G Application scenario ...................... 8 ... -
Page 3: Brief Introduction
DTU_LR_A Instructions 1.Brief introduction DTU_LR_A is a wireless information transmission unit based on LoRa, which mainly uses LoRa modulation technology for data transmission. This DTU can run in two modes: General transparent transmission mode, receiving or sending through AT instruction. Master-slave transparent transmission mode, which can be set as Master or Slave, can interact according to modbus protocol. -
Page 4: Parameter
DTU_LR_A Instructions 1.1 Parameter Classify Specifications Parameter value Radio Working frequency Determined by product identification (for frequency band example: 905-925 MHz 21dBm Transmit power Receiving sensitivity - 148dBm@（10.4 kHz, SF 12） Antenna selection The impedance of SMA antenna pedestal (outer screw inner hole) is 50 ohms. -
Page 5: Indicator Light
DTU_LR_A Instructions Antenna interface SMA antenna pedestal (outer screw inner hole) with impedance of 50 Ω. Power source 5.5*2. 1 standard DC power interface, input voltage 12-36V. The product power input has TVS protection. Power source 3.81*2P screw terminal is connected to DC power supply, and the input voltage is 12-36V. -
Page 6: Appearance Size
DTU_LR_A Instructions 1.4. Appearance size Unit:mm Figure Appearance size Beijing Jia An Electronics Technology Co,.Ltd. http://www.rf-products.com Page 6 of 16 ... -
Page 7: Application Scenario
DTU_LR_A Instructions 2.Application scenario 2.1 LoRa DTU Application scenario The following figure is a schematic diagram of the situation where only LoRa DTU is used, and a LoRa host is connected to the server, which can be connected by RS232 or RS485. On the server side, the ModBus command can be sent to the LoRa host, and the command will be transmitted by the LoRa host through LoRa. -
Page 8: Lora Dtu + 4G Application Scenario
DTU_LR_A Instructions 2.2 LoRa DTU + 4G Application scenario In the application scenario part, we can divide it into two application scenarios. The first one is the application that only needs to send the sensor data back to the server through the Cellular network in outdoor places. The second application scenario is mainly changed from 4G DTU version to 4G-to-LoRa gateway application scenario by concatenating LoRa DTU. -
Page 9: Work Pattern
DTU_LR_A Instructions 3.Work pattern This DTU mainly has two working modes, namely general transparent transmission mode and master-slave transparent transmission mode. In the general transparent transmission mode, all actions in DTU use AT command to tell DTU what behavior it wants, such as letting DTU enter the receiving state now, or letting DTU transmit data. -
Page 10: Master-Slave Transparent Transmission Mode
DTU_LR_A Instructions Master-slave transparent transmission mode After entering the master-slave mode, it means that there is a master with the concept of slave. When the host is idle, it will wait for RS485 or RS232 to see if there is any data coming in, and if there is any data coming in, it will transmit it to the slave. - Page 11 DTU_LR_A Instructions If DTU sets the slave state in master-slave mode, when DTU is idle, it will turn on LoRa receiving mode, and it will wait for whether there is any data coming in the radio frequency. If there is any data coming in, it will send the data to the host controller via RS232 and RS485.
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Page 12: Co-Frequency Transmission Mode
DTU_LR_A Instructions 3.2.1 Co-frequency transmission mode In the same frequency transmission mode, DTU is in the master-slave mode, and the uplink frequency and downlink frequency will use the same frequency to send and receive. Suppose we prepare two DTUs as the master and slave respectively, and make the following settings in the master and slave. -
Page 13: Asynchronous Transmission Mode
DTU_LR_A Instructions 3.2.2 Asynchronous transmission mode In the different frequency transmission mode, DTU is in the master-slave mode, and the uplink frequency and downlink frequency will be sent and received separately. Suppose we prepare two DTUs as the master and slave respectively, and make the following settings in the master and slave. - Page 14 DTU_LR_A Instructions Figure Waterfall diagram of different frequency transmission Beijing Jia An Electronics Technology Co,.Ltd. http://www.rf-products.com Page 14 of 16 ...
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Page 15: Contact Information
DTU_LR_A Instructions 4.Contact information CANSEC Catalog CANSEC Taobao Website Tel: +86‐10‐6888 9971 Email: sarolyn@rf‐products.com grace@rf‐products.com norman@rf‐products.com jimmy@rf‐products.com Technical Support: zhaoyaxi@rf‐products.com Addr: Rm.1002, Block B China Railway Venture building, No.28 Pingguoyuan Rd., Shijingshan District, Beijing, 100041,China. ... - Page 16 DTU_LR_A Instructions Warning Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
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