DTU is the most commonly seen data transmission terminal in the Internet of Things. It provides stable data transparent transmission services for the Internet of Things transmission layer. What are the basic functions and performances of DTU? Let’s find out together below:
DTU function analysis
(1) Remote messaging
① Input circuit: photoelectric isolation;
② Input voltage: comes with DC24V;
③ SOE resolution: 1ms;
④ Remote signaling anti-shake time: 0-60000 milliseconds software-settable;
⑤ An alarm signal is generated when the battery voltage is low;
⑥ Protection action alarm signal and switch energy storage signal;
(2) Remote control
① Output mode: relay normally open contact;
② Contact capacity: AC250V, 5A; DC24V, 5A;
③ More than 2 opening and closing actions after the system is powered off;
④ Remote control execution time: 0-60000 milliseconds software can be set;
⑤ Protection signal returns from a distance;
⑥Battery maintenance;
(3) Data transmission function
① Able to communicate with the main station through a variety of communication methods, report collected and processed information to the main station in real time and accept instructions issued by the main station;
② Able to synchronize time with the main station;
③ Forward information from other terminals;
④ Report the collected electrical energy to the main station;
⑤ If an incident occurs, proactively report it to the main station;
⑥ Provide communication maintenance interface;
⑦ Communication protocol: Supports DL/T634.5101-2002 (IEC60870-5-101), DL/T634.5104-2002 (IEC60870-5-104) using the standard transmission protocol subset IEC60870-5-101 network access, DL /T451-91 cyclic telecontrol protocol, DNP3.0, SC1801, MODBUS and other communication protocols [20];
⑧ Communication interface: RS-232/485, industrial Ethernet, CAN bus;
(4) Fault location and recovery
① When the terminal detects a line fault, it will record the time of fault occurrence and fault parameters, and upload the records to the main station and substations. The master station and substations analyze and judge the fault based on the fault information reported by the DTU, and then generate a fault isolation instruction sequence and a power restoration instruction for the non-fault section. Then it is sent to the corresponding terminal through the master station, and the terminal executes the recovery command to restore the power supply to the non-faulty section;
(5) Local operation
① Perform local operation through the opening and closing switch installed inside the DTU;
(6) Local maintenance function
① The DTU device itself has its own LCD, and the device can also be debugged and maintained through maintenance software. Including the setting and delivery of relevant parameters corresponding to remote control and remote signaling, remote control operation, remote signaling positioning, device reset, etc.;
(7) Self-diagnosis and recovery
① DTU’s board card, clock, memory, etc. will automatically record and report any abnormal signals generated;
② When the device is powered on, it will perform a self-check. If there is any abnormality, it can be restored.
DTU performance
(1) Reliability The high reliability of the device is to meet more stringent environmental requirements. The following series of measures are adopted in the design to improve the reliability of the device.
① The use of industrial-grade chips and military-grade chips;
② A large number of components are packaged in patch packages;
③ Try to use highly integrated devices;
④ The switching output self-tests the coil;
⑤ Isolate strong current and weak current;
⑥ Power supply self-test;
⑦ Digital loop self-test;
⑧ Complete electromagnetic interference shielding and lightning surge discharge processing;
(2) The safety device adopts high current terminal blocks, which have good insulation, corrosion resistance, good connectivity and high safety.
(3) The maintainability device adopts a unified hardware platform to provide conditions for subsequent overall maintenance.
(4) Portability: Try to consider hardware compatibility and software versatility in the design so that the product can be better transplanted.
(5) Testability is subject to standardized testing in accordance with the power industry standard DL/T721-2013.
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