CN202126686U - RS422 interface device of universal hardware platform system - Google Patents
RS422 interface device of universal hardware platform system Download PDFInfo
- Publication number
- CN202126686U CN202126686U CN2011202520873U CN201120252087U CN202126686U CN 202126686 U CN202126686 U CN 202126686U CN 2011202520873 U CN2011202520873 U CN 2011202520873U CN 201120252087 U CN201120252087 U CN 201120252087U CN 202126686 U CN202126686 U CN 202126686U
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- hardware platform
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- platform system
- microprocessor
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Abstract
The utility model provides an RS422 interface device of a universal hardware platform system, which is respectively connected with a microprocessor and external equipment contained in the universal hardware platform system, and is characterized by comprising an RS422 interface control unit and an RS422 bus interface connected with the RS422 interface control unit, wherein the RS422 interface control unit is connected with the microprocessor and adopts an MAX489 controller, and the RS422 bus interface is connected with the external equipment and adopts five-pin type RS422 interface. In the RS422 interface device, the microprocessor contained in the universal hardware platform system can obtain data from the external equipment and output control signals to control the connected external equipment. Compared with the prior art, the RS422 interface device of the universal hardware platform system is capable of effectively isolating the influence of other communication interface circuits, and improving the stability due to larger load current.
Description
Technical field
The utility model relates to a kind of RS422 interface arrangement of general hardware platform system, the RS422 interface arrangement of the general hardware platform system of particularly in various Electronic Control, using.
Background technology
Hardware platform system is the circuit control circuit system that a series of microprocessor, storer are designed according to a requirement.And just being based on the traditional hardware platform, the general hardware plateform system realizes common function.That is to say that general hardware platform system of design is used to multiple device control circuit is provided, and need not all will design again to each device.And in order to adapt to the connection request of multiple device, general hardware platform system often all is provided with multiple communication interface.
Various novel universal hardware platform system equipment considerably beyond multi-purpose computer, arrive network home appliance greatly on number of applications, intelligent appliance, and vehicle electronic devices etc. are popularized extensively.General hardware platform system is application-centered, and computer technology is the basis, and software and hardware can be reduced, and is applicable to that application system has the dedicated computer system of strict demand to function, reliability, cost, volume, power consumption.It generally is made up of four parts such as embedded microprocessor, peripheral hardware equipment, embedded OS and application program of user, is used to realize the functions such as control, supervision or management to other equipment.
Along with the continuous development of electronic technology, the bussing technique of hardware platform system is very ripe, and data transmission can adopt a variety of modes to carry out.The circuit of use is few, cost is low, particularly in remote transmission is, for fear of the inconsistent influence of many line characteristics, and extensively adopts serial communication mode because serial communication mode has.At present, growing the Distance Transmission data adopts the RS422 communication interface to carry out the communication of short distance or long distance mostly.But because the actuation techniques of RS422 system bus adopts the closed loop current actuation techniques mostly; The optically coupled circuit that is connected in series on the system bus needs often, can cause load current bigger like this, causes the instability of control signal easily; If the system bus wire material is relatively poor; Then unsettled situation is more serious, thereby causes influencing each other between the multiple communication interface of hardware platform system, causes the unusual of communication.
Summary of the invention
The utility model is to accomplish in view of the above problems; Its purpose is to provide a kind of RS422 interface arrangement of general hardware platform system; It adopts simple and reliable structural design; Integrate good power consumption control and low cost, thereby erect the general hardware platform system of high-performance, low cost and a low-power consumption.
The RS422 interface arrangement of the general hardware platform system that the utility model relates to, it is connected with external unit with the microprocessor that general hardware platform system is comprised respectively, it is characterized in that; Comprise RS422 interface control unit and connected RS422 EBI; Wherein, above-mentioned RS422 interface control unit is connected with above-mentioned microprocessor, adopts the MAX489 controller; Above-mentioned RS422 EBI is connected with said external equipment, adopts 5 pin type RS422 interfaces.
The effect of the RS422 interface arrangement of the general hardware platform system of the utility model is, between general hardware platform system and peripheral PC or other peripherals, carries out the RS422 serial communication.Through the RS422 interface arrangement that the utility model relates to, the microprocessor in the general hardware platform system can obtain data from external unit, and the output control signal is controlled the external unit that is connected.RS422 interface arrangement with respect to traditional general hardware platform system; The circuit structure that the RS422 interface arrangement that the utility model relates to is adopted can isolate effectively and other communication interface circuits between influence each other; The instability that improvement causes greatly because of load current; Make the general hardware platform system that the utility model was suitable for compared with prior art can avoid the unusual of signal of communication more effectively, practicality is stronger.
Description of drawings
Fig. 1 is the whole block scheme of the RS422 interface arrangement of the general hardware platform system of expression the utility model.
Fig. 2 is the circuit diagram of the RS422 interface arrangement of the general hardware platform system of expression the utility model.
Fig. 3 is the whole block scheme of the expression general hardware platform system that the utility model was suitable for.
Description of reference numerals:
The 1-supply module; 2-keyboard input display unit; 3-keyboard input display unit; 4-LPC processor download module; 5-supplementary functions module; 6-crystal oscillator and reset circuit; The 7-CPLD download module; The 8-LPC processor module; The 9-CPLD module; The multi-functional input/output module of 10-; The 11-IIC bus; The 12-RS232 bus; The 13-RS422 bus; The 14-LAN bus; The 15-IIC bus; The 16-mainboard connects bus; The 17-read signal; The 18-write signal; The 19-microprocessor; The 20-RS422 interface control unit; The 21-RS422 EBI; The 22-external unit.
Embodiment
Below, in conjunction with accompanying drawing the structure and the operating process of the utility model are explained more specifically.
Shown in Figure 1 is the whole block scheme of RS422 interface arrangement of the general hardware platform system of the utility model.
The RS422 interface arrangement of the general hardware platform system of the utility model is connected with external unit 22 with microprocessor 19 respectively; It comprises RS422 interface control unit 20 and connected RS422 EBI 21; Be used for swap data between microprocessor 19 and external unit 22, and transmission of control signals is so that control external unit 22.
Particularly, microprocessor 19 is connected with RS422 interface control unit 20, and RS422 interface control unit 20 is connected with RS422 EBI 21, and RS422 EBI 21 is connected with external unit 22.The control signal of microprocessor 19 transfers in the external unit 22 that is connected with RS422 EBI 21 through RS422 interface control unit 20.The data-signal of external unit 22 transfers in the microprocessor 19 through the RS422 interface control unit 20 that is connected with RS422 EBI 21.RS422 interface control unit 20 plays the effect of control and swap data therein, and RS422 EBI 21 adopts existing RS422 interface.
Shown in Figure 2 is the circuit diagram of RS422 interface arrangement of the general hardware platform system of the utility model.
RS422 EBI 19 is one of international standard communication interfaces.RS422 is a kind of serial physical interface standard, and communication protocol is simple.The RS-422 standard adopts balance to send and realizes communicating by letter with the mode of differential received, has very strong anti-common mode interference ability, and has very high receiving sensitivity.When transmission range was 1000 meters, transfer rate still can reach 100Kbps.
In the circuit diagram as shown in Figure 2, RS422 interface control unit 20 adopts the MAX489 controller.The Y port of MAX489 controller is connected with the 1st pin of 5 pin type RS422 EBIs of RS422 EBI 21.The Z port of MAX489 controller is connected with the 2nd pin of RS422 EBI.The A port of MAX489 controller is connected with the 3rd pin of RS422 EBI.The B port of MAX489 controller is connected with the 4th pin of RS422 EBI.The VCC port of MAX489 controller is connected to power supply, and the 5th pin of GND port and 5 pin type RS422 EBIs is connected to ground wire jointly.Here, the DI port of MAX489 controller is connected to the TXD port of microprocessor 19 (be merely example, be not limited thereto).The RO port of MAX489 controller is connected to the RXD port of microprocessor 19.The RST port of microprocessor 19 is connected to reset circuit, and XTAL1 and XTAL2 port are connected to respectively on two ports of crystal oscillating circuit.
Fig. 3 representes the whole block scheme of the general hardware platform system that the utility model is suitable for.Below, in conjunction with Fig. 3 the one-piece construction of general hardware platform system is described.
General hardware platform system is made up of supply module 1, keyboard input display part, control section and interface section jointly.Wherein supply module 1 provides power supply for keyboard input display part, control section and the interface section of this device, and the required power supply of system is a direct current 5V power supply.
Control section comprises the control device of general hardware platform system, and the interface section comprises the coupled multi-functional input/output module 10 that connects.In the control device of general hardware platform system; LPC processor module 8 is connected with the multi-functional input/output module 10 that comprises the RS422 interface arrangement that the utility model relates to through RS232 bus 12, RS422 bus 13 and LAN bus 14 respectively, and interconnects with external unit through this multi-functional input/output module 10.
Keyboard input display part comprises keyboard input display unit 2 and keyboard input display unit 3.Keyboard input display unit 2 is connected with LPC processor module 8 in the control section through iic bus 11.Keyboard input display unit 3 is connected with LPC processor module 8 in the control section through iic bus 15.Keyboard input display unit 2,3 adopts the ZLG7290 controller.ZLG7290 is a kind of IIC interface keyboard and LED driven management device, and controls such as data decoding and circulation, displacement, segment addressing are provided, and its can sample 64 buttons or sensor, monolithic can accomplish that LED shows, the repertoire of keyboard interface.
RS422 interface arrangement with respect to traditional general hardware platform system; The RS422 interface arrangement that the utility model relates to can isolate effectively and other communication interface circuits between influence each other; The instability that improvement causes greatly because of load current; Make the RS422 interface arrangement that uses the utility model to relate to compared with prior art can avoid the unusual of signal of communication more effectively, practicality is stronger.
Claims (1)
1. the RS422 interface arrangement of a general hardware platform system; It is connected with external unit with the microprocessor that general hardware platform system is comprised respectively, it is characterized in that: comprise RS422 interface control unit and connected RS422 EBI, wherein; Said RS422 interface control unit is connected with said microprocessor; Adopt the MAX489 controller, said RS422 EBI is connected with said external unit, adopts 5 pin type RS422 interfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202520873U CN202126686U (en) | 2011-07-18 | 2011-07-18 | RS422 interface device of universal hardware platform system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202520873U CN202126686U (en) | 2011-07-18 | 2011-07-18 | RS422 interface device of universal hardware platform system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202126686U true CN202126686U (en) | 2012-01-25 |
Family
ID=45489752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202520873U Expired - Fee Related CN202126686U (en) | 2011-07-18 | 2011-07-18 | RS422 interface device of universal hardware platform system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202126686U (en) |
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2011
- 2011-07-18 CN CN2011202520873U patent/CN202126686U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20150718 |
|
| EXPY | Termination of patent right or utility model |