A data acquisition device and self-diagnosis method based on pc104 bus

Abstract

The invention discloses a PC104 bus-based data acquisition apparatus and a self-diagnosis method. The apparatus comprises a main processing module, a communication interface module and a PC104 bus, wherein the main processing module is connected with the communication interface module through the PC104 bus; the main processing module comprises a main CPU, a CPLD and a first latch; the main CPU is connected with the CPLD through an address bus, a data bus, a control bus and a first GPIO bus; the first latch is connected with the address bus and the data bus; the main CPU is connected with the first latch through a second GPIO bus; and the CPLD is connected with the PC104 bus. The apparatus has the advantages that the input cost is low, controllable isolation of the main processing module and the PC104 bus can be realized, deep self-check diagnosis can be accurately carried out, debugging and maintenance are convenient, production and maintenance costs are low, and the like.

Description

technical field [0001] The invention relates to the field of data acquisition based on the PC104 bus, in particular to a data acquisition device and a self-diagnosis method based on the PC104 bus. Background technique [0002] At present, the data acquisition device based on PC104 bus is widely used, and its data acquisition system is generally composed of a main processing module and a plurality of peripheral extended communication interface modules, such as figure 1 As shown, the main processing module communicates with each peripheral expansion communication interface module to obtain data through the PC104 bus, and the other end of each communication interface module communicates with peripheral devices through various communication chips, so as to realize distributed data collection and centralized data processing. idea. The current equipment can correctly collect external interface data and perform effective data analysis and status diagnosis on external equipment whe...

AI Technical Summary

Problems solved by technology

The current equipment can correctly collect external interface data and perform effective data analysis and status diagnosis on external equipment when it is in normal working condition. However, the defect is that there is no complete and effective self-diagnosis method for the equipment itself. When there is a problem with the hardware of a communication interface module on the bus, the main CPU in the main processing module cannot recognize the validity of the data collected through the PC104 bus. Misleading personnel, serious cases may cause great economic losses due to misdiagnosis

[0003] The main possible problems are: 1. When there is a problem with the address and data latch device of a certain communication interface module, the level of one or more lines of the data bus or address bus is forced to be pulled down or pulled up all the time, resulting in The bus data read by the main CPU is invalid data, but the main CPU cannot recognize the validity of the data. If multiple communication interface modules are expanded on the bus at the same time, it will also affect the data communication of other normal communication interface modules, and will also Bringing this kind of bus problem directly inside the main CPU

2. When there is a problem with the software and hardware of the decoder control part of the communication interface module, the read data is invalid, but the main CPU cannot recognize the invalidity

3. Due to a problem with the dual-port RAM device of the communication interface module, the data accessed by the main CPU is invalid, but the main CPU cannot recognize the invalidity

4. When the communication interface module communicates with peripheral equipment, the data is invalid due to interference or other reasons, but the main CPU cannot locate the specific reason

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