CN206506557U - A kind of multifunctional network protocol conversion device - Google Patents

Abstract

The utility model discloses a kind of multifunctional network protocol conversion device, single-chip microcomputer is connected with serial interface chip, keyboard, display, extended menory, power circuit, crystal oscillating circuit, watchdog circuit, Profibus DP bus interface circuits are connected by Profibus DP bus transceivers with Profibus DP buses, Profibus DP bus interface circuits are connected with active crystal oscillator, CAN interface circuit is connected by photoelectric coupled circuit with CAN transceiver, CAN transceiver connects CAN, CAN interface circuit is connected with crystal oscillating circuit, serial interface chip respectively with RS485/RS422 interfaces, RS232 interfaces are connected, the utility model is simple in construction, it can realize that field apparatus is merged with control the seamless of network, versatility is good, needs can flexibly be tackled and control network service with a variety of different agreements, accurate stable, cost is low.

Description

A kind of multifunctional network protocol conversion device

Technical field

The utility model is related to technical field of communication equipment, specifically a kind of multifunctional network protocol conversion device.

Background technology

In industrial control field, LonWorks are automatic control technology and computer communication technology development and mutually melted The networking automatic control technology of conjunction, is all with control from Distributed Control System, field bus control system or even EPA Based on Data Communication in Computer Networks processed, the connection of current live equipment interface and control network is main by supporting different agreement Communication adapter and gateway are realized.This situation is difficult to have taken on a new look in a short time.Different agreement is supported in face of current The various control network system dispute situation, the field apparatus of different vendor is difficult to follow, to realize and controlling network to carry out Data communication, generates the smart machine with data communication interface of the different communications protocol of substantial amounts of support therewith.But mesh The solution that some major companies are provided preceding on the market is expensive, and software development cost is higher, for bottom-layer network price It is too expensive.Therefore, some domestic companies are also dedicated to the research of this respect, and obtain certain achievement, but function phase is to list One, general gateway can only realize a kind of protocol data to the conversion of another protocol data, and communication adapter can only realize one Standard interface data are planted to a kind of conversion of protocol data.Flexibility is not enough with versatility, it is difficult to meet the field control of complexity The requirement of network and equipment communication.

Therefore, for overcome the shortcomings of above-mentioned technology design it is a simple in construction, can realize field apparatus with control net The seamless fusion of network, versatility is good, can flexibly tackle needs and control network service with a variety of different agreements, the low one kind of cost is more Functional network protocol conversion device, exactly inventor problem to be solved.

[utility model content

In view of the shortcomings of the prior art, the purpose of this utility model is to provide a kind of multifunctional network protocol conversion device, Its is simple in construction, can realize field apparatus with control the seamless of network merge, versatility is good, can flexibly tackle needs with it is a variety of not With protocol integrated test system network service, accurate stable, cost is low.

The utility model solves the technical scheme that its technical problem used：A kind of multifunctional network protocol conversion is set Standby, it includes single-chip microcomputer, power circuit, Profibus-DP bus interface circuits, CAN interface circuit, keyboard, display Device, serial interface chip, the single-chip microcomputer are connected to serial interface chip, keyboard, display, extended menory, power supply Circuit, crystal oscillating circuit, watchdog circuit, the Profibus-DP bus interface circuits pass through photoelectric coupled circuit and Profibus-DP Bus transceiver is connected, and the Profibus-DP bus transceivers are connected with Profibus-DP buses, the Profibus-DP Bus interface circuit is connected with active crystal oscillator, and the CAN interface circuit is connected by photoelectric coupled circuit and CAN transceiver Connect, the CAN transceiver connects CAN, the CAN interface circuit is connected with crystal oscillating circuit, and the serial ports connects Mouth chip is connected with RS485/RS422 interfaces, RS232 interfaces respectively.

Further, SPC3 chips are used in the Profibus-DP bus interface circuits.

Further, SJA1000 controllers are used in the CAN interface circuit.

Further, the serial interface circuit uses MAX3162 recombination level conversion chips.

Further, the single-chip microcomputer uses W78E58B chips, and the single-chip microcomputer is powered using 5V power supplys.

The beneficial effects of the utility model are：

1st, the utility model be integrated with Profibus-DP EBIs and CAN interface and RS232, RS485, Tri- conventional serial interfaces of RS422, realize conventional serial ports and the field bus communication of various protocols, and function is more enriched, property Valency can flexibly be used, adjusting data transmittability is strong, and accurate stable is solved in complexity than high, performance stabilization according to site environment Control the data conversion demand of network or special transformation occasion.

Brief description of the drawings

Fig. 1 is the utility model overall structure block diagram.

Fig. 2 is the utility model single chip circuit figure.

Fig. 3 is the utility model Profibus-DP bus interface circuit figures.

Fig. 4 is the utility model CAN interface circuit diagram.

Embodiment

With reference to specific embodiment, the utility model is expanded on further, it should be appreciated that these embodiments are merely to illustrate this Utility model rather than limitation scope of the present utility model.In addition, it is to be understood that reading the content of the utility model instruction Afterwards, those skilled in the art can make various changes or modifications to the utility model, and these equivalent form of values also fall within application Appended claims limited range.

It is the utility model overall structure block diagram referring to Fig. 1, a kind of multifunctional network protocol conversion device of the structure, including There are single-chip microcomputer, power circuit, Profibus-DP bus interface circuits, CAN interface circuit, keyboard, display, serial ports to connect Mouthful chip, single-chip microcomputer be connected to serial interface chip, keyboard, display, extended menory, power circuit, crystal oscillating circuit, Watchdog circuit, Profibus-DP bus interface circuits are connected by photoelectric coupled circuit with Profibus-DP bus transceivers, Profibus-DP bus transceivers are connected with Profibus-DP buses, Profibus-DP bus interface circuits and active crystal oscillator Connection, CAN interface circuit is connected by photoelectric coupled circuit with CAN transceiver, CAN transceiver connection CAN, CAN interface circuit is connected with crystal oscillating circuit, and serial interface chip connects with RS485/RS422 interfaces, RS232 interfaces respectively Connect.

SPC3 chips are used in Profibus-DP bus interface circuits, the communication task of Profibus-DP sides is by agreement core Piece SPC3 is completed.Single-chip microcomputer so while hardware reliability is improved, is substantially reduced by controlling SPC3 to realize data exchange The development amount of software.The design of CAN nodes is realized in CAN interface circuit using SJA1000 controllers.Serial ports Then use can support the MAX3162 recombination levels of RS485, RS232 and RS422 standard serial interface transmission means to interface circuit Conversion chip, realizes the convert task of serial signal and single-chip microcomputer Transistor-Transistor Logic level signal, and reduction hardware cost improves reliable simultaneously Property.

It is the utility model single chip circuit figure referring to Fig. 2, system single-chip microcomputer uses W78E58B chips, W78E58B monolithics Machine has extended out reception and transmission of the 16KB data storage for each network in communication process using PO mouthfuls with part P2 mouthfuls The data buffering of buffering area and single-chip microcomputer.P2.7, P2.6 of single-chip microcomputer pass through decoding as the input signal end of decoder Device selection gating operating die, selection communicates with Profibus-DP buses or CAN.Single-chip microcomputer uses 5V voltage feds, P0 mouthfuls, as address wire least-significant byte and data wire multiplexing port, are separated address with data wire by address latch, P2.0- P2.5 is connected as a high position for address with external data memory.When Profibus-DP buses and CAN are sent to single-chip microcomputer During data, single-chip microcomputer is notified by way of INT0 and INT1 external interrupts.To prevent program fleet, there is provided house dog is electric Road, using chip MAX813L, the P3.5 of single-chip microcomputer constantly exports pulse to watchdog chip, as feeding-dog signal, when program is run Fly, no longer output signal when, circuit reset.

It is the utility model Profibus-DP bus interface circuit figures referring to Fig. 3, Profibus-DP buses are used as standard Fieldbus, Profibus-DP bus interface modules circuit is main to be received by protocol chip SPC3, optocoupler, Profibus-DP buses Send out device composition.The key component of Profibus-DP agreements is realized that remainder is real by single-chip microcomputer by intelligent protocol chip SPC3 It is existing.Single-chip microcomputer is by controlling SPC3 to realize data exchange.Profibus-DP network sides complete the receipts of data using SN75176 Hair task, the differential signal on network can be converted into the RXD mouths that TTL signal is transferred to SPC3 by it, while also can be by SPC3 TTL signal be converted into differential signal, optocoupler uses HC-PL7720, and its baud rate can be met completely up to 25Mb/s Profibus-DP communications need.

Active crystal oscillator provides stable 48M clock frequencies for SPC3 chips.Single-chip microcomputer is controlled by buffer gate circuit 74HC245 Coremaking piece SPC3 works.Serial sending port TXD is connected to the V1 ports of U2_3 chip optocouplers, sends data to Profibus- DP buses；Serial received port RXD is connected to the V0 ends of U2_2 chips, receives the data from bus.RTS ends pass through resistance R9 The VF- ends of U2_4 chips are connected to, request to send signal is used as.SPC3 sends interrupt requests by interrupt INT 0 to single-chip microcomputer, Transmit data communication.Bus transceiver is connected with DB9 aciculiform connectors, one 120 Ω of A, B end parallel connection of bus transceiver end Resistance is held, and increases a jumper switch on terminal resistance, wire jumper is closed when slave station is not or not bus-network two ends and is opened Close, short circuit termination resistance.

It is the utility model CAN interface circuit diagram referring to Fig. 4, SJA1000 ADO~AD7 and the ADO of single-chip microcomputer~ AD7 is connected, and single-chip microcomputer exports Y1 connections SJA1000 CS ends by decoder, when Y1 is low level, SJA1000 gatings It is operated.SJA1000 sends interrupt requests by interrupt INT 1 to single-chip microcomputer, transmits data communication.Reset terminal RST passes through anti- Phase device is connected with watchdog chip, is resetted when program fleet.SJA1000 data are sent out by TXO pins, pass through light Coupling enters bus transceiver PCA82C250 TXD pins, and data in CAN, CAN are sent to then by bus transceiver SJA1000 RXO and RX1 are sent to by optocoupler by the RXD of bus transceiver.High-speed light is used between SJA1000 and CAN Coupling 6N137, and needed plus the Ω of input resistance 390 in optocoupler 6N137 input ports, output port needs to add pull-up resistor 390 Ω。

3 kinds of different serial ports RS232, RS485 and RS422 are supported in serial ports side, therefore use recombination level conversion chip MAX3162 completes the mutual conversion of the TTL signal of serial signal and single-chip microcomputer.MAX3162 can support simultaneously RS232, Tri- kinds of transmission means of RS485, RS422, can also be used as single pass RS485/ as twin-channel RS232 transceivers RS422 transceivers, support RS485/RS422 full and half duplex mode of operation.Support RS485 10Mb/s and RS232 1Mb/s transmission rate.The complexity of circuit design can effectively be mitigated using MAX3162 chips, the steady of circuit is improved It is qualitative.Serial ports side using 2 DB9 needle connectors, one as RS485/RS422 serial interfaces, another is used as RS232 serial ports Interface.

Claims (5)

1. a kind of multifunctional network protocol conversion device, it is characterised in that：It includes single-chip microcomputer, power circuit, Profibus- DP bus interface circuits, CAN interface circuit, keyboard, display, serial interface chip, the single-chip microcomputer are connected to Serial interface chip, keyboard, display, extended menory, power circuit, crystal oscillating circuit, watchdog circuit, it is described Profibus-DP bus interface circuits are connected by photoelectric coupled circuit with Profibus-DP bus transceivers, the Profibus- DP bus transceivers are connected with Profibus-DP buses, and the Profibus-DP bus interface circuits are connected with active crystal oscillator, The CAN interface circuit is connected by photoelectric coupled circuit with CAN transceiver, and the CAN transceiver connection CAN is total Line, the CAN interface circuit is connected with crystal oscillating circuit, the serial interface chip respectively with RS485/RS422 interfaces, RS232 interfaces are connected.

2. a kind of multifunctional network protocol conversion device according to claim 1, it is characterised in that：The Profibus- SPC3 chips are used in DP bus interface circuits.

3. a kind of multifunctional network protocol conversion device according to claim 1, it is characterised in that：The CAN connects SJA1000 controllers are used in mouth circuit.

4. a kind of multifunctional network protocol conversion device according to claim 1, it is characterised in that：The serial interface electricity Road uses MAX3162 recombination level conversion chips.

5. a kind of multifunctional network protocol conversion device according to claim 1, it is characterised in that：The single-chip microcomputer is used W78E58B chips, the single-chip microcomputer is powered using 5V power supplys.