Novel serial communication interface with functions of self-detection and conflict detection

A serial communication interface and conflict detection technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problems of limited communication efficiency and low efficiency, achieve broad application prospects, simple engineering configuration, and improve utilization efficiency Effect

Active Publication Date: 2012-02-15
南京国电南自轨道交通工程有限公司
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Problems solved by technology

The existence of these two times limits the communication efficiency in the polling mode of the 485 bus, and it is impossible to achieve high
The more nodes on a bus, the lower the efficiency

Method used

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  • Novel serial communication interface with functions of self-detection and conflict detection
  • Novel serial communication interface with functions of self-detection and conflict detection

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] When working in the 232 transmission mode, the RTS signal is invalid, and the U2 tri-state buffer is enabled (485 transmission is prohibited at this time), and the serial port TX signal of the CPU is sent to the 232 line (terminal X1) through the U1 bus transceiver. At the same time, the sending signal loops back to the receiving end of U1 through the V1 diode, and finally reaches the receiving end of the CPU through U5. While the CPU is sending, the receiving loop is also working. The internal software of the CPU compares the received data with the sent data, and if they are inconsistent, it can be determined that the port is faulty or the sending conflicts. This mode of work requires 232 to work in half-duplex mode, and the question-and-answer protocol for power systems meets this requirement.

[0022] When working in 232 receiving mode, the ...

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Abstract

The invention relates to a novel serial communication interface with functions of self-detection and conflict detection. A sent signal of the serial interface is circulated inside the interface; a function of a detection port or a conflict on a bus can be detected by comparing received data and sent data in real time, so self-detection and quick bus conflict detection of the port can be realized; and therefore, the reliability and the bus efficiency of the serial interface are improved. By adoption of modes of simultaneously sending and parallel receiving signals by a 232 port and a 485 port, the novel serial communication interface can automatically adapt to the two modes; and engineering configuration is facilitated.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and relates to a novel serial communication interface with self-test and conflict detection. Background technique [0002] With the continuous development of power system automation technology and the extensive use of smart devices in substations and distribution stations, data exchange between smart devices and systems is becoming more and more important. Therefore, connecting and managing data communication interfaces between devices and systems has become a power Indispensable and important equipment for the system automation system. [0003] RS-485 and RS-232C serial interfaces are two commonly used communication interfaces in the field of power system automation. [0004] The full name of the RS-232C standard (protocol) is the EIA-RS-232C standard. The serial communication interface standard has been used and developed, and there are currently several. But they are all impr...

Claims

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Application Information

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IPC IPC(8): H04L29/10H04L12/26
Inventor 张林范三龙郭浩军
Owner 南京国电南自轨道交通工程有限公司
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