Instant messaging method and equipment suitable for single-serial-port equipment and multiple upper computers
A single serial port, bit computer technology, applied in computer control, general control systems, instruments, etc., can solve problems such as hidden safety hazards, adverse network effects, and the inability of the national network to issue command instruments, so as to improve robustness and reduce security. effect of risk
Inactive Publication Date: 2015-04-29
张丽
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Problems solved by technology
[0005] 1. The stability of the system is subject to the local network. Once the local network fails, the national network will not be able to obtain data
[0006] 2. The maintenance cost of the national network is too high. If the data acquisition requirements of the local network change, the data coding of the national network must be modified accordingly
[0007] 3. If the local network has already carried out network quality control, the national network cannot complete the network quality control task
[0008] 4. There is an uplink wire connection between the national network and the local network, which poses a safety hazard. Once one of the networks has a sudden high-voltage shock, it may have an adverse effect on the other network
[0009] Networked quality control refers to the two-way communication between the upper computer and the monitoring instrument. According to the current method, the national network cannot issue commands to the instrument, so the task of networked quality control cannot be completed.
Method used
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[0036] like figure 1 As shown, when the smart converter receives a command from the host computer 1, an interrupt program is triggered, and the smart converter stores the command in the "host computer 1" storage area. The smart converter has a built-in time accuracy cycle (this time is set to 0.05s) to scan the storage area and the status of the data channel. If the "host computer 2" is in the communication state with the monitoring instrument, it will wait, and if not, it will directly send it to the monitoring instrument. The command stored by "host computer one" locks the state of the data channel at the same time, and the timer starts counting. If the monitoring instrument does not respond within preset time one (T1), the data channel lock state will be released. If there is a response, keep the data channel unobstructed, and at the same time reset the timer through the signal trigger interrupt program; if the communication is completed, there will be no data transmission...
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Disclosed is an intelligent serial port converter suitable for single-serial-port equipment and multiple upper computers. The multiple upper computers comprise a first upper computer and a second upper computer, and the intelligent serial port converter comprises a power module, a central processing unit module, a multi-path analogue switch integrated chip, an RS232 level conversion chip, a failure processing module and an RS232 interface module. The central processing unit module controls and manages the power module, the multi-path analogue switch integrated chip, the RS232 level conversion chip, the failure processing module and the RS232 interface module. The device and method have the advantages that compatibility is achieved, wherein through the equipment, all the upper computers can actively build double-direction data channels with a monitoring instrument, and data recovery needed by the upper computers can be obtained; the stability is achieved, wherein corresponding operation of a certain upper computer on a monitoring instrument cannot disturb other upper computers, and the stability of a monitoring network is ensured; safety is achieved, wherein in the normal working process, an original wire communication mode does not exist among the upper computers, and safety risks of the original wire direct communication are reduced.
Description
technical field [0001] The invention relates to an instant communication method and device for a single serial port device and multiple upper computers used in an environment monitoring networked quality control system. Background technique [0002] In the field of automatic environmental monitoring, many monitoring instruments only have one data serial port, and use the master-slave communication protocol for data transmission, which means that one instrument can only perform half-duplex asynchronous two-way communication with one host computer, and the host computer passes The serial port obtains the environmental monitoring data of the monitoring instrument. If there are multiple host computers, only one of the host computers can send commands to the instrument, and the other host computers can only monitor the data returned by the instrument. [0003] At present, the country is committed to establishing a nationwide set of data transmission and networked quality control ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G05B19/042
CPCG05B19/0428G05B2219/2612
Inventor叶贤满李健军张丽王晓彦孙卫杰刘冰蕉荔徐昶洪盛茂孙鸿良徐鸿张天
Owner张丽