CN202261368U

CN202261368U - Gateway

Info

Publication number: CN202261368U
Application number: CN2011203859061U
Authority: CN
Inventors: 王忠福; 王延超; 连承华
Original assignee: CNR Dalian Electric Traction R& D Center Co Ltd
Current assignee: CRRC Yangtze Co Ltd
Priority date: 2011-10-11
Filing date: 2011-10-11
Publication date: 2012-05-30
Anticipated expiration: 2021-10-11

Abstract

The embodiment of the utility model provides a gateway which comprises a LONWORKS bus interface used for connecting with an external LONWORKS bus, a transceiver used for protocol conversion and signal format conversion and connected with the LONWORKS bus interface and an RS485 interface used for electrical characteristic conversion and connected with the transceiver. In the gateway, with the technical means of carrying out electrical characteristic conversion between an RS485 signal and an RS485 physical signal through the RS485 interface and protocol conversion and signal format conversion between the RS485 signal and a LONWORKS bus signal through the transceiver, the LONWORKS bus interface used for transferring the LONWORKS bus signal and the RS485 interface used for transferring the RS485 physical signal can be intercommunicated.

Description

Gateway

Technical field

The utility model embodiment relates to communication technical field, relates in particular to a kind of gateway.

Background technology

The LONWORKS Control Network is one of current comparatively popular fieldbus, and it is to be released and advocated jointly with Motorola, Toshiba company by U.S. Echelon company, forms in formal announcements in 1992.Its network chip Neuron chip is integrated (the International Standard Organization of International Standards Organization; Be called for short ISO)/Open Systems Interconnection (Open System Interconnection; Abbreviation OSI) whole seven layer protocols have communication and controlled function simultaneously, and 34 kinds of common I/O (Input/Output are provided; Be called for short I/O) controlling object, operating temperature range wide (40 ℃～85 ℃).

The signal transmission medium of LONWORKS Control Network can be twisted-pair feeder, power line, wireless, infrared ray, optical cable; Network topology forms such as supporting bus type, ring-like, free topological type; Network transceivers has direct driving, EIA-485 type, three kinds of forms of transformer coupled interface; Satisfied demands of different, transmission signals adopts Differential Manchester Encoding simultaneously, makes network have very strong antijamming capability.Direct communication distance when employing twisted-pair feeder, baud rate are the communication network of 78 bits per seconds (bps) can reach 2700 meters (m), adds the hardware supports that it is powerful, makes to be easy in certain spatial dimension, constitute the various system of function.

Medium accesses control (the Media Access Control of LONWORKS Control Network; Be called for short MAC) adopted measurable P to adhere to (Predictive P-Persistent) Carrier Sense Multiple Access (Carrier Sense Multiple Access; Be called for short CSMA), make when network overload, still to keep very high throughput; Network configuration can adopt master-slave mode and to equality.Have development of equipments, debugging and erection units such as supporting node, router, gateway, integrated development environment makes that the developing and debugging of system is simple, can realize the off-line of network, online design, on-line debugging or the remote debugging through IP network.

Object Oriented method has been adopted in the network service of LONWORKS Control Network, need not take time during application programming and consider the loaded down with trivial details programming of communications portion; And it has integrated development environment, is easy to exploitation, installs and debugging.

Just because of the above-mentioned advantage of LONWORKS Control Network, a lot of network equipments all have been equipped with the LONWORKS EBI.In addition, the RS485 interface also is a common interfaces of the network equipment.But, also can't realize the intercommunication of LONWORKS EBI and RS485 interface in the prior art.

The utility model content

The utility model embodiment provides a kind of gateway, is used to realize the intercommunication of LONWORKS EBI and RS485 interface.

The utility model embodiment provides a kind of gateway, comprising:

Be used to connect the LONWORKS EBI of outside LONWORKS bus;

Be used for the transceiver of protocol conversion and signal format conversion, be connected with said LONWORKS EBI;

Be used for the RS485 interface of electrical characteristic conversion, be connected with said transceiver.

Also comprise: memory is connected with said transceiver.

Said gateway also comprises:

The RS232 interface that is used for serial monitoring and data configuration is connected with said transceiver.

Said RS485 interface specifically comprises:

The logical signal translation circuit is connected with said transceiver;

Be used for the interface circuit of electrical characteristic conversion and electrical isolation, be connected with said logical signal translation circuit;

The signal protection circuit is connected with said interface circuit.

Said LONWORKS EBI comprises chip FT-X2, and the pin one of said chip FT-X2 is connected outside LONWORKS bus with pin two;

Said transceiver comprises chip FT3150, and the pin two 8 of said chip FT3150 connects the pin 5 of said chip FT-X2, and the pin two 9 of said chip FT3150 connects the pin 6 of said chip FT-X2;

Said logical signal translation circuit comprises chip 74ABT04D; The pin one of said chip 74ABT04D connects the pin one 6 of said chip FT3150; The pin 8 of said chip 74ABT04D connects the pin one 4 of said chip FT3150, and the pin 5 of said chip 74ABT04D connects the pin 4 of said chip FT3150;

Said interface circuit comprises chip MAX1480; The pin 9 of said chip MAX1480 connects the pin 4 of said chip 74ABT04D; The pin one 1 of said chip MAX1480 connects the pin 6 of said chip 74ABT04D, and the pin one 3 of said chip MAX1480 connects the pin 9 of said chip 74ABT04D;

Said signal protection circuit comprises two diode P6KE15CA; The anode of said two diode P6KE15CA all connects the pin two 0 and supervisor 16 of said chip MAX1480 through resistance; The negative electrode of one of them diode P6KE15CA connects the pin two 5 of said chip MAX1480 through resistance, and the negative electrode of another diode P6KE15CA connects the pin two 3 of said chip MAX1480 through resistance.

Said memory comprises chip 29C512; The data wire pin of said chip 29C512 is connected with the address wire pin with the data wire pin of said chip FT3150 with the address wire pin, and the write signal of said chip 29C512, enable signal, chip selection signal pin are connected with read-write, enable signal, the address signal pin of said chip FT3150 respectively.

Said RS232 interface specifically comprises:

Chip MAX232, the pin one 2 of said chip MAX232 connects the pin two of said chip FT3150, and the pin one 1 of said chip MAX232 connects the pin 3 of said chip FT3150;

Serial ports RS232, the pin two of said serial ports RS232 connect the pin one 3 of said chip MAX232, and the pin 3 of said serial ports RS232 connects the pin one 4 of said chip MAX232.

Said transceiver also comprises:

The chip DS1233Z-5 that is used to monitor, the reseting pin of said chip DS1233Z-5 is connected with the reseting pin of said chip FT3150;

Memory interface circuit is connected with the power pin of said chip FT3150;

The data acquisition interface circuit is connected with clock pin, service pin, the reseting pin of said chip FT3150.

Said LONWORKS EBI also comprises: eight diode BAV99, and wherein four diode BAV99 connect the pin 5 and pin 6 of said chip FT-X2 respectively, and four diode BAV99 connect pin one and the pin two of said chip FT-X2 respectively in addition.

The utility model embodiment has adopted through the RS485 interface and has carried out electrical characteristic conversion between RS485 signal and the RS485 physical signalling; Through the technological means that transceiver carries out protocol conversion and the signal format conversion between RS485 signal and the LONWORKS bus signals, can realize transmitting the intercommunication of LONWORKS EBI with the RS485 interface that transmits the RS485 physical signalling of LONWORKS bus signals.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.

The structural representation of a kind of gateway that Fig. 1 provides for the utility model embodiment;

Fig. 2 is a kind of circuit diagram of LONWORKS EBI;

Fig. 3 is a kind of circuit diagram of transceiver;

Fig. 4 is a kind of circuit diagram of RS485 interface;

Fig. 5 is a kind of circuit diagram of memory;

Fig. 6 is a kind of circuit diagram of RS232 interface.

Embodiment

For the purpose, technical scheme and the advantage that make the utility model embodiment clearer; To combine the accompanying drawing among the utility model embodiment below; Technical scheme among the utility model embodiment is carried out clear, intactly description; Obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.

The structural representation of a kind of gateway that Fig. 1 provides for the utility model embodiment.As shown in Figure 1, this gateway comprises:

Be used to connect the LONWORKS EBI 31 of outside LONWORKS bus;

Be used for the transceiver 32 of protocol conversion and signal format conversion, be connected with LONWORKS EBI 31;

Be used for the RS485 interface 33 of electrical characteristic conversion, be connected with transceiver 32.

Particularly, this gateway can connect outside LONWORKS bus through inner LONWORKS EBI 31, and is connected to outside LONWORKS EBI through outside LONWORKS bus.Gateway can also connect outside RS485 interface through inner RS485 interface 33.

When RS485 interface 33 received outside RS485 physical signalling, 33 pairs of said RS485 physical signallings of RS485 interface carried out the electrical characteristic conversion, generate the RS485 signal; 32 pairs of said RS485 signals of transceiver carry out protocol conversion and signal format conversion, generate the LONWORKS bus signals; LONWORKS EBI 31 sends to the LONWORKS bus signals on the outside LONWORKS bus.

Here; The RS485 physical signalling is the signal that satisfies the RS485 physical electric performance, and the agreement of LONWORKS bus signals and RS485 signal is all different with signal format, particularly; The LONWORKS bus signals is followed the LonTalk agreement, and the RS485 signal is followed the agreement of application layer.The said LONWORKS bus signals that the conversion back generates carries and the same information of said RS485 signal.

When LONWORKS EBI 3 received the LONWORKS bus signals of outside LONWORKS bus transmission, 32 pairs of said LONWORKS bus signals of transceiver carried out protocol conversion and signal format conversion, generate the RS485 signal; 33 pairs of said RS485 signals of RS485 interface carry out the electrical characteristic conversion, generate the RS485 physical signalling, and send.

Here, the said RS485 signaling bearer and the same information of said LONWORKS bus signals of the generation of conversion back.

In order to preserve the dynamic data that transceiver 32 produces when carrying out the conversion of protocol conversion and signal format, in one of the utility model optional embodiment, this gateway also comprises: memory 34 is connected with transceiver 32.

For gateway is monitored and data configuration, in the another optional embodiment of the utility model, this gateway also comprises:

The RS232 interface 35 that is used for serial monitoring and data configuration is connected with transceiver 32.

Particularly, gateway can be connected to management server through RS232 interface 35, and the keeper can carry out data configuration to gateway through management server, and its operating state is monitored, and in time finds fault.

In the another optional embodiment of the utility model, RS485 interface 33 specifically comprises:

The logical signal translation circuit is connected with transceiver 32;

Be used for the interface circuit of electrical characteristic conversion and electrical isolation, be connected with the logical signal translation circuit;

The signal protection circuit is connected with said interface circuit.

In the practical application, the above-mentioned part of gateway has multiple way of realization respectively.For instance; The LONWORKS EBI adopts chip FT-X2 chip to realize, transceiver adopts chip FT3150 realization etc., and the logical signal translation circuit adopts chip 74ABT04D to realize; Interface circuit adopts chip MAX1480 to realize, the signal protection circuit adopts two diode P6KE15CA to realize.

Particularly, LONWORKS EBI 31 comprises chip FT-X2, and the pin one of said chip FT-X2 is connected outside LONWORKS bus with pin two;

Transceiver 32 comprises chip FT3150, and the pin two 8 of said chip FT3150 connects the pin 5 of said chip FT-X2, and the pin two 9 of said chip FT3150 connects the pin 6 of said chip FT-X2;

LONWORKS EBI 31 can also comprise:

Eight diode BAV99, wherein four diode BAV99 connect the pin 5 and pin 6 of said chip FT-X2 respectively, and four diode BAV99 connect pin one and the pin two of said chip FT-X2 respectively in addition.

Transceiver 32 can also comprise:

Memory interface circuit is connected with the power pin of said chip FT3150;

Memory 34 comprises chip 29C512; The data wire pin of said chip 29C512 is connected with the address wire pin with the data wire pin of said chip FT3150 with the address wire pin, and the write signal of said chip 29C512, enable signal, chip selection signal pin are connected with read-write, enable signal, the address signal pin of said chip FT3150 respectively.

RS232 interface 35 specifically comprises:

Fig. 2 is a kind of circuit diagram of LONWORKS EBI; Fig. 3 is a kind of circuit diagram of transceiver; Fig. 4 is a kind of circuit diagram of RS485 interface; Fig. 5 is a kind of circuit diagram of memory; Fig. 9 is a kind of circuit diagram of RS232 interface.

Shown in Fig. 2～6; Pin one 4 and the pin one 6 of FT3150; As the Data Receiving and the data transmitting pin of serial communication, the pin one 4 of FT3150 is connected to the pin 8 of 74ABT04D, and the data on the universal serial bus receive through the pin two 3 or 25 of MAX1480; Be processed into the RS485 signal of the electrical characteristic that satisfies FT3150 through the MAX1480 inner transformation, deliver to FT3150 by the pin one 3 of MAX1480 through 74ABT04D and handle; The pin one 6 of FT3150 is connected to the pin one of 74ABT04D, and serial ports sends data and sends to the pin one of 74ABT04D through the pin one 6 of FT3150, becomes to satisfy the electrical characteristic signal of demand on the actual serial ports physical bus through MAX1480 chip internal conversion process.

FT-X2 is the communication transformer of LONWORKS EBI, in order to improve the bus Electro Magnetic Compatibility, can also add additional device BAV99, electric capacity, the piezo-resistance that prevents overtension on the bus on the communication line.

FT3150 also can accomplish simple data acquisition function as processor simultaneously except satisfying basic LONWORKS communication need, and the periphery of FT3150 mainly comprises monitoring chip DS1233Z-5, memory interface, data acquisition interface etc.DS1233Z-5 is used for monitoring power voltage, and FT3150 resets after supply voltage is lower than the certain amplitude of FT3150 supply power voltage.

The data wire pin of 29C512 directly is connected with the address wire pin with the corresponding data wire pin of FT3150 with the address wire pin; The pin 31 of 29C512, pin two 4, pin two 2 are respectively write signal, enable signal, chip selection signal, and the logical relation of these signals is based on that logic OR and the non-conversion of logical AND of the read-write of FT3150, enable signal, address signal come out.

When MAX1480 satisfies RS485 physical electrical characteristic, can signal be carried out electrical isolation, improve the noiseproof feature of gateway; P6KE15CA can suppress too high surge voltage in the signal protection circuit.

In the another optional embodiment of the utility model, gateway (being also referred to as integrated circuit board) comprises one road RS232 interface, LONWORKS EBI, memory, LONWORKS smart transceiver (being transceiver 32) and 6 road RS485 interfaces.Running state information when one road RS232 interface is used for the monitor board card start-up with work, configuration integrated circuit board operational factor.Memory is used for integrated circuit board and deposits the operation configuration parameter.This integrated circuit board has the LONWORKS EBI, and communications protocol is LonTalk.The LONWORKS smart transceiver of this integrated circuit board simultaneously also can be as processor except satisfying basic LONWORKS communication need.

What should explain at last is: above embodiment is only in order to the technical scheme of explanation the utility model, but not to its restriction; Although the utility model has been carried out detailed explanation with reference to previous embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the scope of each embodiment technical scheme of essence disengaging the utility model of relevant art scheme.

Claims

1. a gateway is characterized in that, comprising:

Be used to connect the LONWORKS EBI of outside LONWORKS bus;

2. gateway according to claim 1 is characterized in that, also comprises: memory is connected with said transceiver.

3. gateway according to claim 2 is characterized in that, also comprises:

4. gateway according to claim 3 is characterized in that, said RS485 interface specifically comprises:

The logical signal translation circuit is connected with said transceiver;

The signal protection circuit is connected with said interface circuit.

5. gateway according to claim 4 is characterized in that, said LONWORKS EBI comprises chip FT-X2, and the pin one of said chip FT-X2 is connected outside LONWORKS bus with pin two;

6. gateway according to claim 2; It is characterized in that; Said memory comprises chip 29C512; The data wire pin of said chip 29C512 is connected with the address wire pin with the data wire pin of said chip FT3150 with the address wire pin, and the write signal of said chip 29C512, enable signal, chip selection signal pin are connected with read-write, enable signal, the address signal pin of said chip FT3150 respectively.

7. according to the said gateway of claim 3, it is characterized in that said RS232 interface specifically comprises:

8. gateway according to claim 5 is characterized in that, said transceiver also comprises:

Memory interface circuit is connected with the power pin of said chip FT3150;

9. gateway according to claim 8; It is characterized in that; Said LONWORKS EBI also comprises: eight diode BAV99; Wherein four diode BAV99 connect the pin 5 and pin 6 of said chip FT-X2 respectively, and four diode BAV99 connect pin one and the pin two of said chip FT-X2 respectively in addition.