CN202267955U - Serial port tester with adjustable communication speed rate - Google Patents
Serial port tester with adjustable communication speed rate Download PDFInfo
- Publication number
- CN202267955U CN202267955U CN2011203781457U CN201120378145U CN202267955U CN 202267955 U CN202267955 U CN 202267955U CN 2011203781457 U CN2011203781457 U CN 2011203781457U CN 201120378145 U CN201120378145 U CN 201120378145U CN 202267955 U CN202267955 U CN 202267955U
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- Prior art keywords
- serial port
- signal
- circuit
- communication speed
- frequency
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- Expired - Fee Related
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- 238000004891 communication Methods 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 239000000872 buffer Substances 0.000 claims abstract description 12
- 230000011664 signaling Effects 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
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Abstract
The utility model discloses a serial port tester with an adjustable communication speed rate. The serial port tester is technically characterized by comprising a serial port connector, a signal conversion circuit, a buffer circuit, a frequency dividing circuit and an indicator lamp, wherein one end of the serial port connector is connected with a serial port of tested equipment, and the other end of the serial port connector is connected with the signal conversion circuit to realize conversion of a recommended standard (RS)-232 signal and a transistor-transistor logic (TTL) signal; the signal conversion circuit, the buffer circuit, the frequency dividing circuit and the indicator lamp are sequentially connected; the frequency dividing circuit performs frequency division on an input signal to reduce the frequency of the signal; and the indicator lamp displays the input signal. The serial port tester with the adjustable communication speed rate is reasonable in design; by connecting the serial port tester and the serial port of the tested equipment and performing frequency division on a communication signal, a visible light emitting diode flickering function is realized; meanwhile, output of different frequency-dividing signals is controlled by using an adjusting knob; and the serial port tester is applicable to serial port test with different communication speed rates and can quickly, simply and accurately test whether the RS-232 serial port operates normally.
Description
Technical field
The utility model belongs to the technology of serial communication field, especially a kind of adjustable communication speed serial ports tester.
Background technology
Serial communication interface EIA-RS-232C is a kind of interface commonly used, in a lot of equipment, all is furnished with RS-232 interface, and the electric energy meter calibrating apparatus that for example often uses at power department just is provided with the RS-232 serial line interface.Because the RS-232 interface signal level value is higher, therefore, the serial port circuit chip in the electric energy meter calibrating apparatus often is damaged, and causes the electric energy meter calibrating apparatus cisco unity malfunction.At present; Serial communication interface is tested, usually need special-purpose AccessPort software and with serial ports receive, transmitting terminal carries out short circuit, judges that according to whether receiving the own character of being sent out serial ports is fine or not then; The problem of its existence is: can only judge whether fault of serial ports hardware; And can not judge whether fault of electric energy meter calibrating apparatus in house software, and need cooperate AccessPort software just can detect simultaneously, neither easy not directly perceived yet.
Summary of the invention
The purpose of the utility model is to overcome the deficiency of prior art, and a kind of reasonable in design and adjustable communication speed serial ports of use simple and direct tester is provided.
The utility model solves its technical matters and takes following technical scheme to realize:
A kind of adjustable communication speed serial ports tester; Comprise serial port connector, signaling conversion circuit, buffer circuit, frequency dividing circuit and pilot lamp; This serial port connector one end is connected with the serial ports of equipment to be tested; The other end of this serial port connector is connected with signaling conversion circuit and realizes the conversion of RS-232 signal and TTL signal; Signaling conversion circuit, buffer circuit, frequency dividing circuit and pilot lamp are connected successively, and frequency dividing circuit carries out frequency division to reduce signal frequency and to show through pilot lamp to input signal.
And described serial port connector comprises data input pin, data output pin and grounding pin.
And described pilot lamp is a light emitting diode.
And described frequency dividing circuit is connected with adjusting knob and realizes the output of multiple fractional frequency signal.
And described signaling conversion circuit adopts MAX232 or MAX202 interface chip; Described buffer circuit adopts 4050 gate circuit chips; Described frequency dividing circuit adopts 74LS390 frequency divider chip.
The advantage and the good effect of the utility model are:
The utility model is reasonable in design; It is connected with the serial ports of equipment to be tested and communication signal is carried out frequency division handle; Realize the LED flash function that human eye can be distinguished, simultaneously, regulate the output of the different fractional frequency signals of control through adjusting knob; Whether can adapt to the serial ports test of different communication speeds, it is in proper working order fast, simply, accurately to test the RS-232 serial ports.
Description of drawings
Fig. 1 is the circuit block diagram of the utility model;
Fig. 2 is the test analysis processing flow chart of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model embodiment is done further detailed description:
A kind of adjustable communication speed serial ports tester; As shown in Figure 1, connect and compose successively by serial port connector, signaling conversion circuit, buffer circuit, frequency dividing circuit and pilot lamp, serial port connector comprises data input pin, data output pin and grounding pin; This serial port connector is connected with the serial ports of equipment to be tested; Serial port connector is connected with signaling conversion circuit and realizes the conversion of RS-232 signal and TTL signal, and frequency dividing circuit carries out frequency division with reduction data output pin signal frequency through adjusting knob to signal, thereby adapts to the test of different communication speeds; Realize the pilot lamp flicker that human eye can be distinguished, pilot lamp adopts light emitting diode.As shown in Figure 2; In the present embodiment, signaling conversion circuit adopts MAX232 or MAX202 interface chip (U1 chip among Fig. 2), and the transmission mouth of the RS-232 serial ports of serial equipment to be tested (TXD pin) inserts the reception R2IN end of MAX232 interface chip; Just can obtain Transistor-Transistor Logic level from the R2OUT output of MAX232 interface chip; The direct buffer circuit of this Transistor-Transistor Logic level, this buffer circuit adopt 6 road non-inverting buffers, 4050 gate circuit chips (U2 chip among Fig. 2), and Transistor-Transistor Logic level is connected to the 2A pin of 4050 gate circuit chip U2; The output terminal of this 4050 gate circuit chip U2 is connected on the input end of frequency dividing circuit; This frequency dividing circuit adopts 74LS390 frequency divider chip (U3 chip among Fig. 2), and the U3 chip can carry out 5 frequency divisions or 10 frequency divisions to the signal of input, and frequency division output directly connects LED light; Under the normal situation of communication, the pilot lamp that can visually see flicker.
It is emphasized that; The described embodiment of the utility model is illustrative; Rather than it is determinate; Therefore the utility model is not limited to the embodiment described in the embodiment, every by those skilled in the art according to other embodiments that the technical scheme of the utility model draws, belong to the scope of the utility model protection equally.
Claims (5)
1. adjustable communication speed serial ports tester; It is characterized in that: comprise serial port connector, signaling conversion circuit, buffer circuit, frequency dividing circuit and pilot lamp; This serial port connector one end is connected with the serial ports of equipment to be tested; The other end of this serial port connector is connected with signaling conversion circuit and realizes the conversion of RS-232 signal and TTL signal; Signaling conversion circuit, buffer circuit, frequency dividing circuit and pilot lamp are connected successively, and frequency dividing circuit carries out frequency division to reduce signal frequency and to show through pilot lamp to input signal.
2. adjustable communication speed serial ports tester according to claim 1, it is characterized in that: described serial port connector comprises data input pin, data output pin and grounding pin.
3. adjustable communication speed serial ports tester according to claim 1, it is characterized in that: described pilot lamp is a light emitting diode.
4. adjustable communication speed serial ports tester according to claim 1 is characterized in that: described frequency dividing circuit is connected with adjusting knob and realizes the output of multiple fractional frequency signal.
5. according to each described adjustable communication speed serial ports tester of claim 1 to 4, it is characterized in that: described signaling conversion circuit adopts MAX232 or MAX202 interface chip; Described buffer circuit adopts 4050 gate circuit chips; Described frequency dividing circuit adopts 74LS390 frequency divider chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203781457U CN202267955U (en) | 2011-10-09 | 2011-10-09 | Serial port tester with adjustable communication speed rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203781457U CN202267955U (en) | 2011-10-09 | 2011-10-09 | Serial port tester with adjustable communication speed rate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202267955U true CN202267955U (en) | 2012-06-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203781457U Expired - Fee Related CN202267955U (en) | 2011-10-09 | 2011-10-09 | Serial port tester with adjustable communication speed rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202267955U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109165129A (en) * | 2018-09-01 | 2019-01-08 | 安恒环境科技（北京）股份有限公司 | Serial communication test device |
| CN111224789A (en) * | 2019-12-12 | 2020-06-02 | 林丹霞 | Internet equipment with multi-rate interface |
-
2011
- 2011-10-09 CN CN2011203781457U patent/CN202267955U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109165129A (en) * | 2018-09-01 | 2019-01-08 | 安恒环境科技（北京）股份有限公司 | Serial communication test device |
| CN111224789A (en) * | 2019-12-12 | 2020-06-02 | 林丹霞 | Internet equipment with multi-rate interface |
| CN111224789B (en) * | 2019-12-12 | 2022-05-10 | 方伟锋 | Internet equipment with multi-rate interface |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TIANJIN ELECTRIC POWER CORP. Effective date: 20130521 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: TIANJIN ELECTRIC POWER CORP. Effective date: 20130521 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 300010 HEBEI, TIANJIN TO: 100031 XICHENG, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130521 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: Tianjin Electric Power Corp. Address before: 300010 Tianjin city Hebei District Wujing Road No. 39 Patentee before: Tianjin Electric Power Corp. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120606 Termination date: 20191009 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |