CN2702370Y

CN2702370Y - RS232 serial port signal and PS/2 keyboard (mouse) signal transforming cable

Info

Publication number: CN2702370Y
Application number: CN 200420059493
Authority: CN
Inventors: 刘洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-17
Filing date: 2004-05-17
Publication date: 2005-05-25
Anticipated expiration: 2014-05-17

Abstract

The utility model comprises a converting circuit, a RS232 serial port interface, a PS/2 male opening interface and a PS/2 female opening interface. The converting circuit is composed of a gate circuit chip, an electrical level conversion chip and a SCM chip. The gate circuit chip and the electrical level conversion chip are respectively connected with the SCM chips. The PS/2 male opening interface and the PS/2 female opening interface are respectively connected with the gate circuit chip and the SCM chip via the cables. The RS232 serial port interface is connected with the electrical level conversion chip via cables. The utility model can connect the equipment using RS232 serial port to output (such as barcode scanner, IC card reader, electronic scales, and bar code scanner) with the PC or POS which is provided with input equipment such as PS/2 keyboard (mouse). The utility model also can connect the general PS/2 keyboard (mouse) directly to the equipment with RS232 serial port interface such as PDA, SCM and printer.

Description

A kind of RS232 rs 232 serial interface signal and PS/2 keyboard (mouse) conversion of signals line

Technical field the utility model relates to a kind of data output/input device, a kind of specifically RS232 rs 232 serial interface signal and PS/2 keyboard (mouse) conversion of signals line.

Background technology is owing to current scientific technological advance is very fast, various novel I/O interface and communications protocol thereof constantly occur, these novel I/O interface brings the huge while easily for human, also, many inconvenience have been caused because the I/O interface of I/O interface that a lot of equipment of early producing uses and current main-stream is incompatible.Wherein particularly outstanding is the RS232 serial line interface, because the widespread use of RS232 serial interface, causing at present, many also equipment in term of life have used the RS232 serial line interface.Iff because the inconvenience of I/O interface exchange device more will bring very big upgrade cost for the user.And PS/2 is as present widely used I/O interface, if the PS/2 device signal can be converted to the RS232 rs 232 serial interface signal, can make PS/2 equipment be applied to go in the system of only RS232, will bring great convenience for the user of serial equipment.

Summary of the invention is for solving the problems of the technologies described above, basic design of the present utility model is by using the hardware conversion circuit that the conversion of signals RS232 signal of PS/2 keyboard output is input to serial ports, or serial ports is exported the RS232 conversion of signals become PS/2 keyboard (mouse) signal, realize thus:

1. will use the equipment of RS232 serial ports output,, couple together as PC, POS machine as bar-code scanner, IC-card card reader, electronic scales, barcode scanner etc. and the equipment that PS/2 keyboard (mouse) input is arranged;

2. common PS/2 keyboard (mouse) being directly connected to PDA, single-chip microcomputer, printer etc. has on the equipment of RS232 serial interface.

The utility model comprises a change-over circuit, a RS232 serial interface, a public mouthful interface of PS/2, female mouthful of interface of a PS/2;

Change-over circuit is made up of gate circuit chip, level transferring chip, singlechip chip, and the gate circuit chip is connected with singlechip chip respectively with level transferring chip;

The public mouthful interface of PS/2 and female mouthful of interface of PS/2 are connected with singlechip chip by cable difference AND circuit chip respectively, and the RS232 serial interface is connected with level transferring chip by cable.

RS232 serial interface of the present utility model can use the DB9 serial port interface, also can use the DB25 serial interface.

As further improvement of the utility model, can be by change-over circuit being provided with to change the serial ports Transmission bit rate, realize remote the connection, connect distance and be respectively 15 meters (baud rates 19200), 50 meters (baud rate 9600), 100 meters (baud rate 4800)

In addition, the utility model can be used in combination, can be earlier with PS/2 keyboard (mouse) signal, convert the RS232 rs 232 serial interface signal to, after the long-distance transmissions by the RS232 rs 232 serial interface signal, again the RS232 rs 232 serial interface signal is changed back PS/2 keyboard (mouse) signal, reached the effect of remote prolongation keyboard (mouse).

Use the utility model that following benefit is arranged:

1. use hardware conversion, the maintenance system is clean, stops the mistake that causes because of the software compatibility;

2. realize remote-controlled operation PS/2 keyboard (mouse).

3. compatible DB9 interface and DB25 interface.

Description of drawings is described in further detail the utility model below in conjunction with the drawings and specific embodiments.

Fig. 1 is a connection diagram of the present utility model;

Fig. 2 is singlechip chip pinout figure of the present utility model.

Embodiment as shown in Figure 1, the utility model comprises a change-over circuit, RS232 serial interface, a public mouthful interface of PS/2, female mouthful of interface of a PS/2.Change-over circuit is made up of gate circuit chip, level transferring chip, singlechip chip, and the gate circuit chip is connected with singlechip chip respectively with level transferring chip; In actual use, the gate circuit chip uses the 74HC40 chip, and level transferring chip is used the MAX232 chip, and singlechip chip uses 2051 chips of 51 series.Female mouthful of interface of public mouthful interface of PS/2 and PS/2 is connected with 2051 chips with the 74HC40 chip by cable respectively, and the RS232 serial interface is connected with the MAX232 chip by cable, and in the utility model, the RS232 serial ports uses the DB9 interface.

Use the utility model will use the equipment of RS232 serial ports output, as barcode scanner, IC-card card reader, electronic scales, barcode scanner etc. and the equipment that PS/2 keyboard (mouse) input is arranged, as PC, when the POS machine couples together, the RS232 serial interface is connected with serial equipment, the public mouthful interface of PS/2 is connected with the equipment that PS/2 keyboard (mouse) input is arranged, female mouthful of interface of PS/2 can be connected with PS/2 keyboard (mouse), realizes having the equipment simulating keyboard (mouse) of RS232 serial interface and the equipment of PS/2 interface input to communicate with one another thus.By using the supporting software of the utility model, directly the keyboard (mouse) of simulation is operated, realize the high speed input of data, and reduced maloperation.

Using the utility model that common PS/2 keyboard is directly connected to PDA, single-chip microcomputer, printer etc. has on the equipment of RS232 serial interface, realizes using PS/2 keyboard (mouse) directly the said equipment to be operated.

And the utility model also can be connected on the equipment that has RS232 serial interface and PS/2 interface simultaneously, in the time of by dummy keyboard keyboard of RS232 serial ports simulation, external original PS/2 keyboard realizes connecing simultaneously the keyboard more than 2, reaches the purpose of expansion interface.

Consider actual operating position, the utility model makes equipment not external PS/2 keyboard after using the utility model pass through the device power-up self check by changing the pin setting of 2051 singlechip chips.

In addition, the utility model is by changing the pin setting of 2051 singlechip chips, can also change the baud rate of serial ports transmission, realize the long-distance transmissions of signal: 15 meters (baud rate 19200), 50 meters (baud rate 9600), 100 meters (baud rate 4800), thus realize remote-controlled operation keyboard (mouse).

And because the characteristic of 2051 chips itself, can carry out self-definedly according to actual conditions to its specific pin by the user, strengthened the extendability of the utility model when application.

The definition of 2051 pin of chip as shown in Figure 2, and is as shown in table 1 to being provided with of pin.When pin is provided with, with 2051 singlechip chips in the change-over circuit of the present utility model, after promptly the chip of 20 pin takes off, need be provided with by institute's concrete condition, [insertion] is exactly chip pin to be straightend insert in the base, [do not insert] is exactly that chip pin is outwards broken off with the fingers and thumb, do not insert in the base, after being provided with chip reinstalled to get final product.

Pin	18	Function
Pin	18	Function		Be provided with	Do not insert	Self-defined
Insert	Self-defined				Do not insert	Self-defined
Insert	Self-defined		Pin		17	Function
Be provided with	Do not insert	Self-defined			17	Function
	Do not insert	Self-defined		Insert	Self-defined
	Pin	15	16	Insert	Self-defined		Function
Be provided with	Pin	15	16	Do not insert	Do not insert	Baud rate 9600b/s,	Function
	Insert	Insert	Baud rate 9600b/s, startup self-detection	Do not insert	Do not insert	Baud rate 9600b/s,
	Insert	Insert	Baud rate 9600b/s, startup self-detection	Do not insert	Insert	Baud rate 19200b/s,
	Insert	Do not insert	Baud rate 4800b/s,	Do not insert	Insert	Baud rate 19200b/s,

Table 1

Claims

A kind of RS232 rs 232 serial interface signal and PS/2 keyboard (mouse) conversion of signals line

1. RS232 rs 232 serial interface signal and PS/2 keyboard (mouse) conversion of signals line is characterized in that: comprise a change-over circuit, a public mouthful interface of RS232 serial ports, a public mouthful interface of PS/2, female mouthful of interface of a PS/2;

Change-over circuit is made up of gate circuit chip, level transferring chip, singlechip chip, and the gate circuit chip is connected with singlechip chip respectively with level transferring chip;

Female mouthful of interface of public mouthful interface of PS/2 and PS/2 is connected with singlechip chip by cable AND circuit chip respectively, and the RS232 serial interface is connected with level transferring chip by cable.
2. a kind of RS232 rs 232 serial interface signal according to claim 1 and PS/2 keyboard (mouse) conversion of signals line is characterized in that: the gate circuit chip uses the 74HC40 chip, and level transferring chip is used the MAX232 chip, and singlechip chip uses 2051 chips.
3. a kind of RS232 rs 232 serial interface signal according to claim 1 and 2 and PS/2 keyboard (mouse) conversion of signals line, it is characterized in that: the serial ports Transmission bit rate can be controlled by change-over circuit, 19200,9600,4800 switchings.
4. a kind of RS232 rs 232 serial interface signal according to claim 3 and PS/2 keyboard (mouse) conversion of signals line, it is characterized in that: the serial ports Transmission bit rate can be controlled by change-over circuit, 19200,9600,4800 switchings.
5. a kind of RS232 rs 232 serial interface signal according to claim 1 and 2 and PS/2 keyboard (mouse) conversion of signals line, it is characterized in that: the RS232 serial interface can be selected any one interface in DB9 interface and the DB25 interface.
6. a kind of RS232 rs 232 serial interface signal according to claim 3 and PS/2 keyboard (mouse) conversion of signals line, it is characterized in that: the RS232 serial interface can be selected any one interface in DB9 interface and the DB25 interface.
7. a kind of RS232 rs 232 serial interface signal according to claim 4 and PS/2 keyboard (mouse) conversion of signals line, it is characterized in that: the RS232 serial interface can be selected any one interface in DB9 interface and the DB25 interface.