Portable networking test device based on RS-485 communication technology
A technology of RS-485 and communication technology, which is applied in the field of portable networking test devices, can solve the problem that there is no way to accurately judge the polarity and load conditions of the RS485 networking of smart meters
Inactive Publication Date: 2015-08-26
STATE GRID CORP OF CHINA +2
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Problems solved by technology
[0003] At present, in the RS-485 networking site, most of the tests can only be carried out by using a multimeter to test the bus voltage. This test method can only preliminarily judge whether the bus voltage can meet the communication requirements of the smart meter RS485 networking, but it does not Method to accurately judge the polarity and load of the smart meter RS485 network
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[0016] A portable networking testing device based on RS-485 communication technology, comprising a CPU control unit, an analog load circuit 30, an impedance test circuit 20 and a voltage test circuit 10, and the CPU control unit is connected to the analog load circuit 30 and the impedance test circuit respectively 20 and the voltage test circuit 10 two-way communication, the RS-485 interface of the CPU control unit is connected with the RS-485 line of the equipment under test, the two-way communication between the CPU control unit and the equipment under test, the CPU control unit adopts the AM3352 chip , the analog load circuit 30 includes a 485 level conversion chip and an analog switch, the 485 level conversion chip adopts the AZRS485 chip, and the analog switch adopts the SN74LV4051 chip, such as figure 1 shown. The CPU control unit sends test control signals to the simulated load circuit 30 , the impedance test circuit 20 and the voltage test circuit 10 respectively.
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The invention relates to a portable networking test device based on an RS-485 communication technology. The device comprises a CPU control unit, a simulation load circuit, an impedance test circuit and a voltage test circuit. The CPU control unit is bidirectionally communicated with the simulation load circuit, the impedance test circuit and the voltage test circuit respectively. An RS-485 interface of the CPU control unit is connected to an RS-485 wire of tested equipment. The CPU control unit is bidirectionally communicated with the tested equipment. The CPU control unit adopts an AM3352 chip. The simulation load circuit comprises a 485 level conversion chip and a simulation switch. The 485 level conversion chip adopts an AZRS485 chip. The simulation switch adopts a SN74LV4051 chip. Through the device, whether the tested RS-485 equipment is compatible with an RS-485 network which needs networking can be effectively determined; a communication condition of the RS-485 equipment can be separately determined; a communication condition of given equipment can be tested through networking. Simulation loads are established. The different loads can be switched to test a load amount which is supported by a current network.
Description
technical field [0001] The invention relates to the technical field of verification and detection of electric equipment, in particular to a portable network testing device based on RS-485 communication technology. Background technique [0002] In the latest smart energy meter standard promulgated by the State Grid in 2012, the requirements for non-polarity 485 communication are clearly put forward. At present, there is no relevant and effective test method for RS-485 testing in China, especially after networking. The difference between the equipment carried on the RS-485 network, whether the old equipment and lines can be perfectly compatible with the access of the non-polarity 485 meter has become the biggest problem in the current practical application. [0003] At present, in the RS-485 networking site, most of the tests can only be carried out by using a multimeter to test the bus voltage. This test method can only preliminarily judge whether the bus voltage can meet the...
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Inventor 庄磊张宏生梁晓伟陈晨胡兆庭徐刚黄丹朱毓
Owner STATE GRID CORP OF CHINA