CN102346959A

CN102346959A - Remote acquisition system of analog signals

Info

Publication number: CN102346959A
Application number: CN 201110230284
Authority: CN
Inventors: 赵明; 程鹏; 孙进; 邓昕才; 王晓华; 盛晓文
Original assignee: Beijing Institute of Electronic System Engineering
Current assignee: Beijing Institute of Electronic System Engineering
Priority date: 2011-08-11
Filing date: 2011-08-11
Publication date: 2012-02-08

Abstract

Relating to a signal acquisition system, the invention specifically relates to an on-site acquisition and remote transmission system of analog signals. The system overcomes the problem of slow bus remote data transmission speed in prior art and can be used for signal acquisition. The system comprises an analog signal acquisition device (1) for a tested object, an A/D switching circuit (2) and a remote computer (4). The analog signal output end of the analog signal acquisition device (1) for a tested object is connected to the analog signal input end of the A/D switching circuit (2). The system also includes an M-LVDS bus system (3), one end of which is connected to the digital signal output end of A/D switching circuit (2) and the other end of which is connected to the remote computer (4).

Description

A kind of remote gathering system of simulating signal

Technical field

The present invention relates to a kind of signal acquiring system, be specifically related to a kind of collection in worksite distance transmission system of simulating signal.

Background technology

The on-the-spot scene that belongs to environmental hazard of a variety of controls is arranged; Be not suitable for the people at the scene or near operate; Therefore control desk often is arranged on the position away from the scene, and what relate to thus is to be transferred to position distant, the control desk place to collection in worksite to signal.This type situation often adopts the RS-422 bus to carry out the remote transmission to field data at present, but the speed of the RS-422 bus transfer under the remote condition is slower, makes that the response speed of control procedure is slower.

Summary of the invention

The remote gathering system that the purpose of this invention is to provide a kind of simulating signal is to overcome the slow-footed problem of bus remote data transmission of prior art.It comprises collection of simulant signal device 1, A/D change-over circuit 2 and the remote computer 4 of measurand; The analog signal output of the collection of simulant signal device 1 of measurand connects the input end of analog signal of A/D change-over circuit 2; It also comprises M-LVDS bus system 3; The digital signal output end of A/D change-over circuit 2 connects an end of M-LVDS bus system 3, and the other end of M-LVDS bus system 3 connects remote computer 4.

M-LVDS bus system used in the present invention has the following advantages: M-LVDS is used for the transmission of high-speed video signal more, and transfer rate is high; M-LVDS has very strong anti-interference; Interface is realized simple, is easy to expansion; Support multiple kinds and communication modes.Therefore the data that collect at the scene of the present invention can be delivered on the long-range control desk fast, thereby can make control desk in time make control command in view of the above, make the response speed of control procedure fast.

Description of drawings

Fig. 1 is a structural representation of the present invention, and Fig. 2 is the structural representation of embodiment two.Fig. 3 is the implementation procedure figure that receives the state machine of data in the embodiment two, and Fig. 4 is the implementation procedure figure that sends the state machine of data in the embodiment two.

Embodiment

Embodiment one: specify this embodiment below in conjunction with Fig. 1.This embodiment comprises collection of simulant signal device 1, A/D change-over circuit 2 and the remote computer 4 of measurand; The analog signal output of the collection of simulant signal device 1 of measurand connects the input end of analog signal of A/D change-over circuit 2; It also comprises M-LVDS bus system 3; The digital signal output end of A/D change-over circuit 2 connects an end of M-LVDS bus system 3, and the other end of M-LVDS bus system 3 connects remote computer 4.

The transmission range of M-LVDS bus system 3 is smaller or equal to 300 meters in this embodiment.High-speed data transmission adopts the M-LVDS bus to realize, uses DS91C176 data-driven receiving chip, and the data transmission rate that this chip can reach up to 200Mb/s with the clock frequency up to 100MHz drives up to 32 loads.The same 6 line systems that adopt, the HDLC agreement, transfer rate is set to 50Mb/s, substantially exceeds the transfer rate of 422 bus 10Mb/s.

Embodiment two: specify this embodiment below in conjunction with Fig. 2,3 and 4.The difference of present embodiment and embodiment one is: said M-LVDS bus system 3 comprises differential signal transmission cable 3-1; Near-end bus interface circuit 3-3 and far-end bus interface circuit 3-2; Said near-end bus interface circuit comprises transmitter 3-3-2, receiver 3-3-3, FPGA module 3-3-4 and PC104 module 3-3-5; The data input pin of the data output end of transmitter 3-3-2 and receiver 3-3-3 is connected to the end of differential signal transmission cable 3-1; The data output end of the data input pin of transmitter 3-3-2 and receiver 3-3-3 is connected to data output end and the data input pin of FPGA module 3-3-4; The pci bus transmit port of FPGA module 3-3-4 connects PC104 module 3-3-5; The bidirectional data transfers port of far-end bus interface circuit is connected the other end of differential signal transmission cable 3-1, and the composition structure of far-end bus interface circuit is identical with the near-end bus interface circuit with connected mode.

Adopting the DS90LV048 chip as receiver, convert the Low Voltage Differential Signal that receives into the Transistor-Transistor Logic level signal, adopt DS90LV047 as transmitter, is that Low Voltage Differential Signal sends with the Transistor-Transistor Logic level conversion of signals.The reception of data and transmission are based on that the state machine of Verilog HDL language realizes.Said state machine is realized that by PC104 module 3-3-5 the process of the state machine of reception data as shown in Figure 3.

As shown in Figure 3, the Idle state is an original state, sends over the Start state that enters into as data, judges frame head at the Start state, if frame head correctly gets into the Prg state, otherwise returns the Idle state, abandons the arrival that these frame data continue to wait for frame head.After state machine enters into the Prg state, begin to receive data, at first detect the address of data and the address of this module settings and whether mate, if do not match then declarative data is not issued this module, return the Idle state, if matching addresses then receive data.After receiving data, enter into the Stop state, the halted state machine turns back to original state and waits for the next frame data.

The process of the state machine of transmission data is opposite with receiving course, as shown in Figure 4.

As shown in Figure 4, the Idle state is an original state, allows to enter into the Start state after the transmission when receiving, and sends frame head at Start, gets into Prg then.After state machine enters into the Prg state, data of Fa Songing at first, wherein, first byte of data is the address of receiver module, is configured by embedded computer.State machine enters into the Stop state after having sent data, stops data and sends and turn back to next this data transmission of original state wait.

Claims

1. the remote gathering system of a simulating signal; It comprises collection of simulant signal device (1), A/D change-over circuit (2) and the remote computer (4) of measurand; The analog signal output of the collection of simulant signal device (1) of measurand connects the input end of analog signal of A/D change-over circuit (2); It is characterized in that it also comprises M-LVDS bus system (3); The digital signal output end of A/D change-over circuit (2) connects an end of M-LVDS bus system (3), and the other end of M-LVDS bus system (3) connects remote computer (4).

2. the remote gathering system of a kind of simulating signal according to claim 1, the transmission range that it is characterized in that M-LVDS bus system (3) is smaller or equal to 300 meters.

3. the remote gathering system of a kind of analog signal according to claim 1; It is characterized in that said M-LVDS bus system (3) comprises differential signal transmission cable (3-1); Near-end bus interface circuit (3-3) and far-end bus interface circuit (3-2); Said near-end bus interface circuit comprises transmitter (3-3-2), receiver (3-3-3), FPGA module (3-3-4) and PC104 module (3-3-5); The data input pin of the data output end of transmitter (3-3-2) and receiver (3-3-3) is connected to an end of differential signal transmission cable (3-1); The data output end of the data input pin of transmitter (3-3-2) and receiver (3-3-3) is connected to the data output end and the data input pin of FPGA module (3-3-4); The pci bus transmit port of FPGA module (3-3-4) connects PC104 module (3-3-5), and the bidirectional data transfers port of far-end bus interface circuit is connected the other end of differential signal transmission cable (3-1).