CN203554484U - RS-485 bus test equipment - Google Patents

Abstract

The utility model discloses RS-485 bus test equipment which comprises the components of: a PXI/CPCI interface module which is used for realizing data exchange between a PXI/CPCI detecting system and an RS-485 bus control module; an RS-485 bus control module which is used for transmitting data that are downloaded from the PXI/CPCI detecting system to tested RS-485 equipment, and performing decoding and validating on the data that are uploaded by the tested RS-485 equipment for analysis and processing by the PXI/CPCI detecting system; an RS-485 bus interface driving module which is used for realizing data exchange between the RS-485 bus control module and the tested RS-485 equipment; and a power supply module which is used for supplying power for the whole RS-485 bus test equipment. The performance of the RS-485 bus test equipment is better than that of the RS-485 bus test equipment based on the PCI interface. The RS-485 bus test equipment can be widely applied for the occasion of the equipment based on the RS-485 bus more widely and conveniently.

Description

RS-485 bus test equipment

Technical field

The utility model relates to bus test equipment technical field, is specifically related to a kind of RS-485 bus test equipment.

Background technology

Data acquisition and Industry Control are many based on universal serial bus.In serial communication bus, RS-485 bus is because it is easy to use and with low cost being subject to used more and more widely.Therefore, the test of the electronic equipment based on RS-485 bus (RS-485 standard device), maintenance just seem and have become more and more important.At present, RS-485 bus test equipment is mostly based on pci interface, and it is between tested RS-485 equipment and the PXI/CPCI detection system of PC, and is only correct detection service data to be given to tested RS-485 equipment move detection, function singleness.

Utility model content

The utility model object be to provide a kind of based on PXI/CPCI interface and with binary channels from ring the RS-485 bus test equipment with communication check function.

Above-mentioned purpose is achieved through the following technical solutions:

A kind of RS-485 bus test equipment, is characterized in that, comprising: PXI/CPCI interface module, for realizing the exchanges data between PXI/CPCI detection system and RS-485 bus control module; RS-485 bus control module, for the data that described PXI/CPCI detection system is passed down, be given to tested RS-485 equipment, and the decoding data of uploading through described tested RS-485 equipment and verification are carried out to analyzing and processing to be given to described PXI/CPCI detection system; RS-485 bus interface driver module, for realizing the exchanges data between described RS-485 bus control module and described tested RS-485 equipment; Power module, for giving whole RS-485 bus test equipment power supply.

As concrete technical scheme, described PXI/CPCI interface module comprises interconnective PXI/CPCI interface and PXI/CPCI bridging chip, described PXI/CPCI interface is connected with described PXI/CPCI system, described PXI/CPCI bridging chip is connected with described RS-485 bus control module, for realizing the parallel data of Transistor-Transistor Logic level and the conversion of PXI/CPCI data/address bus.

As concrete technical scheme, described PXI/CPCI bridging chip adopts PCI9030 chip.

As concrete technical scheme, described RS-485 bus control module, is realized by programmable chip, in it, is provided with: processing unit, for the work of the each module in control chip inside and the each parts of chip exterior; The coding/decoding functional module of RS-485 bus protocol, for by data encoding, and by data decode and verification; Sendaisle, sends to described RS-485 bus interface driver module for setting logic by encoded data; Receive path, receives data that described RS-485 bus interface driver module uploads with to be decoded and verification for setting logic.

As concrete technical scheme, described programmable chip adopts EP3C25F324 chip.

As concrete technical scheme, described RS-485 bus interface driver module comprises interconnective RS-485 bus transceiver and RS-485 Bus isolation optical coupler, described RS-485 Bus isolation optical coupler is connected with described RS-485 bus control module, described RS-485 bus transceiver and described tested RS-485 equipment connection.

As concrete technical scheme, described RS-485 bus transceiver adopts MAX485ESA data collector, and described RS-485 Bus isolation optical coupler adopts HCPL-2630 optical coupler.

The beneficial effect of the RS-485 bus test equipment that the utility model provides is: the RS-485 bus test equipment providing due to the utility model is based on PXI/CPCI interface, its performance is better than the RS-485 bus test equipment based on pci interface, can more extensively and expediently be applied to the occasion of the equipment based on RS-485 bus; Secondly, RS-485 bus control module is wrong decoding data and the verification to be given to tested RS-485 bus apparatus and tested RS-485 equipment is uploaded through RS-485 bus of RS-485 bus injection with people, with the occasion of facilitate emulation bus to make mistakes time reply, simultaneously can be the cause investigation that causes data to be made mistakes in RS-485 bus communication process out.In addition, programmable chip, with binary channels universal serial bus, guarantees that by the self-loop function from tape channel RS-485 standard device is normal.

Accompanying drawing explanation

The structured flowchart of the RS-485 bus test equipment that Fig. 1 provides for the utility model embodiment.

The internal structure block diagram of the RS-485 bus test equipment that Fig. 2 provides for the utility model embodiment.

Embodiment

As shown in Figure 1, the RS-485 bus test equipment that the present embodiment provides, for test board, comprises PXI/CPCI interface module, RS-485 bus control module, RS-485 bus interface driver module and power module.Wherein RS-485 bus control module is connected with PXI/CPCI interface module and RS-485 bus interface driver module, and power module is given whole RS-485 bus test equipment power supply.

As shown in Figure 2, PXI/CPCI interface module is connected between PXI/CPCI detection system and RS-485 bus control module, for realizing the exchanges data between PXI/CPCI detection system and RS-485 bus control module.PXI/CPCI interface module comprises interconnective PXI/CPCI interface and PXI/CPCI bridging chip, PXI/CPCI interface is connected with PXI/CPCI detection system (not shown), PXI/CPCI bridging chip is connected with the processing unit of RS-485 bus control module, for realizing the parallel data of Transistor-Transistor Logic level and the conversion of PXI/CPCI data/address bus.By operating in the various transfer of data of the detection software controllable device in PXI/CPCI detection system, speed maximum can realize 133Mbit/s.

Continuation is referring to Fig. 2, the form that RS-485 bus control module adopts programmable chip to add RS-485 bus control unit IP kernel realizes, for the data that PXI/CPCI detection system is passed down, encode and inject mistake to be given to tested RS-485 equipment, and the decoding data of uploading through tested RS-485 equipment and verification are carried out to analyzing and processing to be given to PXI/CPCI detection system.RS-485 bus control module is realized by programmable chip, and programmable chip adopts EP3C25F324 chip.In it, be provided with: processing unit, for the work of the each module in control chip inside and the each parts of chip exterior.The coding/decoding functional module of RS-485 bus protocol, for by data encoding or and inject mistake, and by data decode and verification.Sendaisle, for setting logic by encoded or and inject wrong data and send to described RS-485 bus interface driver module.Receive path, receives data that described RS-485 bus interface driver module uploads with to be decoded and verification for setting logic.

Continuation is referring to Fig. 2, RS-485 bus interface driver module is connected between RS-485 bus control module and tested RS-485 equipment, for realizing the exchanges data between RS-485 bus control module and tested RS-485 equipment, comprise the data-signal driving of output interface and the data-signal buffering of input interface.RS-485 bus interface driver module comprises interconnective RS-485 bus transceiver and RS-485 Bus isolation optical coupler, RS-485 Bus isolation optical coupler is connected with sendaisle and the receive path of RS-485 bus control module, RS-485 bus transceiver and tested RS-485 equipment connection (not shown).

Power module, its be input as+3.3V and+5V direct current, output have+2.5V ,+1.2V direct current is organized output more, can meet the power supply requirement of most of application scenarios.

In the present embodiment, the concrete model of PXI/CPCI bridging chip is PCI9030.The programmable chip of RS-485 bus control module adopts fpga chip, and concrete model is Cyclone III EP3C25F324.RS-485 bus transceiver adopts MAX485ESA data collector, and RS-485 Bus isolation optical coupler adopts HCPL-2630 optical coupler.

During the utility model work, its PXI/CPCI interface is connected with PXI/CPCI detection system, RS-485 bus interface driver module is connected with tested RS-485 bus apparatus, realize the exchanges data between tested RS-485 bus apparatus and PXI/CPCI detection system, its workflow specifically comprises two flow processs: send datamation flow process and receive datamation flow process.

Send datamation flow process:

First in PXI/CPCI detection system, operation detects software, by it, the relevant parameter of sendaisle is set, the parameter information arranging is sent to the processing unit of programmable chip by PXI/CPCI interface, the parameter that processing unit passes down according to PXI/CPCI detection system arranges sendaisle, complete the initialization operation of sendaisle, then user is again by the detection software in operation PXI/CPCI detection system, by PXI/CPCI interface module, to programmable chip, inject the packet that will send, this packet is through the coding of the coding/decoding functional module of RS-485 bus protocol, parallel data changes into the serial data that meets RS-485 bus transfer, in cataloged procedure, the instruction that can pass down according to PXI/CPCI detection system is injected mistake or is not injected mistake packet, by sendaisle, press the transmission logic of setting again and input RS-485 bus interface driver module with the form signal of Transistor-Transistor Logic level, through RS-485 bus interface driver module, realize the output of the RS-485 bus standard signal of telecommunication and be input to tested RS-485 bus apparatus through RS-485 bus, whether the reaction by observation RS-485 standard device is corresponding to reach the object whether tested RS-485 bus apparatus of detection is qualified with the data of input, and convenience is simulated the occasion of tackling when RS-485 standard device is made mistakes.

Receive datamation flow process:

First in PXI/CPCI detection system, operation detects software, by it, the relevant parameter of receive path is set, the parameter information arranging is sent to programmable chip by PXI/CPCI interface module, the parameter that processing unit passes down according to PXI/CPCI detection system arranges receive path, complete the initialization operation of receive path, then, the received data sent from tested RS-485 bus apparatus (may be correct data/may be also wrong data) realize the conversion of level by RS-485 bus interface driver module, decoded after the coding/decoding functional module of RS-485 bus protocol that enters programmable chip through receive path, serial data changes into the parallel data that meets the transmission of PXI/CPCI interface, data are carried out to verification simultaneously, parallel data and check results realize uploading of data by PXI/CPCI communication module again, and the detection software moving in PXI/CPCI detection system shows the data of receiving in real time, if wrong data, can navigate to is the mistake of which class, the mistake that is for example tested RS-485 bus apparatus self causes makeing mistakes of data, or the problem of RS-485 bus causes makeing mistakes of data etc.

The utility model is not limited to above-described embodiment, based on simple replacement above-described embodiment, that do not make creative work, should belong to the scope that the utility model discloses.

Claims (5)

1. a RS-485 bus test equipment, is characterized in that, comprising:

PXI/CPCI interface module, connects PXI/CPCI detection system and RS-485 bus control module;

RS-485 bus control module;

RS-485 bus interface driver module, connects described RS-485 bus control module and tested RS-485 equipment; And

Power module, for giving whole RS-485 bus test equipment power supply;

Described RS-485 bus control module, is realized by programmable chip EP3C25F324 chip, in it, is provided with: processing unit, for the work of the each module in control chip inside and the each parts of chip exterior; The coding/decoding functional module of RS-485 bus protocol, for by data encoding, and by data decode and verification; Sendaisle, sends to described RS-485 bus interface driver module for setting logic by encoded data; And receive path, for setting logic, receive data that described RS-485 bus interface driver module uploads with to be decoded and verification.

2. RS-485 bus test equipment as claimed in claim 1, it is characterized in that: described PXI/CPCI interface module comprises interconnective PXI/CPCI interface and PXI/CPCI bridging chip, described PXI/CPCI interface is connected with described PXI/CPCI system, described PXI/CPCI bridging chip is connected with described RS-485 bus control module, for realizing the parallel data of Transistor-Transistor Logic level and the conversion of PXI/CPCI data/address bus.

3. RS-485 bus test equipment as claimed in claim 2, is characterized in that: described PXI/CPCI bridging chip adopts PCI9030 chip.

4. RS-485 bus test equipment as claimed in claim 1, it is characterized in that: described RS-485 bus interface driver module comprises interconnective RS-485 bus transceiver and RS-485 Bus isolation optical coupler, described RS-485 Bus isolation optical coupler is connected with described RS-485 bus control module, described RS-485 bus transceiver and described tested RS-485 equipment connection.

5. RS-485 bus test equipment as claimed in claim 4, is characterized in that: described RS-485 bus transceiver adopts MAX485ESA data collector, and described RS-485 Bus isolation optical coupler adopts HCPL-2630 optical coupler.

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