CN202794419U - COM port loopback test fixture - Google Patents
COM port loopback test fixture Download PDFInfo
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- CN202794419U CN202794419U CN 201220422381 CN201220422381U CN202794419U CN 202794419 U CN202794419 U CN 202794419U CN 201220422381 CN201220422381 CN 201220422381 CN 201220422381 U CN201220422381 U CN 201220422381U CN 202794419 U CN202794419 U CN 202794419U
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- com port
- negative pole
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Abstract
The utility model discloses a COM port loopback test fixture which comprises a fixture body, a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh, an eighth pin, a ninth pin, a first diode, a second diode, a third diode, a fourth diode and a fifth diode, wherein the fixture body corresponds to a COM port; and the first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh, the eighth pin and the ninth pin correspond to corresponding pins positioned on the COM port. An anode of the first diode is connected with the fourth pin, a cathode of the first diode is connected with the first pin, an anode of the second diode is connected with the fourth pin, a cathode of the second diode is connected with the sixth pin, an anode of the third diode is connected with the third pin, a cathode of the third diode is connected with the second pin, an anode of the fourth diode is connected with the seventh pin, a cathode of the fourth diode is connected with the eighth pin, an anode of the fifth diode is connected with the seventh pin, and a cathode of the fifth diode is connected with the ninth pin. The cathode of the first diode is connected with the cathode of the second diode, and the cathode of the fourth diode is connected with the cathode of the fifth diode. Whether the sequence of the COM port pins is correct can be tested through the COM port loopback test fixture.
Description
[technical field]
The utility model relates to a kind of loop-around test tool, particularly relates to a kind of com port loop-around test tool.
[background technology]
Com port is COM port, and interface standard standard and the bus standard standard of com port are RS-232.The full name of rs-232 standard is the EIA-RS-232 standard, and wherein EIA (Electronic Industry Association) represents EIA, RS(recommended standard) represent proposed standard, the 232nd, identification number.Its regulation stube cable and machinery, electrical specification, semiotic function and transport process.
Can be provided with com port on the present PC (notebook computer and desktop computer), and when its each pin tested, usually can use measurement jig as shown in Figure 1.See also Fig. 1, Fig. 1 illustrates and is prior art com port loop-around test jig structure synoptic diagram.Described com port loop-around test tool comprises: the first pin 1(Data carrier detect, DCD; Carrier detect), the second pin 2(Receive data, RXD; Receive data), the 3rd pin 3(Transmit data, TXD; Send data), the 4th pin 4(Data terminal ready, DTR; DTR), the 5th pin 5(Signal ground, GND; Signal ground), the 6th pin 6(Data set ready, DSR; DSR), the 7th pin 7(Request to send, RTS; Request sends), the 8th pin 8(Clear to send, CTS; Allow to send), the 9th pin 9(Ring Indicator, RI; The ring indication).
More than each pin be connected respectively respective pins on the PC com port.Wherein, above-mentioned the first pin 1, the 4th pin 4, the 6th pin 6 link to each other with wire; Above-mentioned the second pin 2, the 3rd pin 3 link to each other with wire; Above-mentioned the 7th pin 7, the 8th pin 8, the 9th pin 9 link to each other with wire; The 5th pin ground connection.
Yet, when adopting above-mentioned measurement jig to test, if three pins order each other of the first pin 1 of corresponding described measurement jig, the 4th pin 4, the 6th pin 6 is wrong on the PC com port; Perhaps two pins order each other of the second pin 2 of corresponding described measurement jig, the 3rd pin 3 is wrong on the PC com port; Three pins order each other of the 7th pin 7 of corresponding described measurement jig, the 8th pin 8, the 9th pin 9 is wrong again or on the PC com port.If loop itself is normal, its demonstration result when loop-around test still passes through for test.
Therefore, when adopting above-mentioned com port loop-around test tool to test, can't reach whether the position of each pin in the loop is correctly tested.
In view of this, be necessary to develop a kind of electric screwdriver torsion and earth leakage tester in fact, to address the above problem.
[summary of the invention]
Therefore, the purpose of this utility model provides a kind of com port loop-around test tool, and whether the position that can't judge each pin in the loop when solving test correct problem.
In order to achieve the above object, the com port loop-around test tool that the utility model provides, described measurement jig comprises:
The tool body, its corresponding described com port;
The first to the 9th pin, the respective pins on its corresponding described com port;
The first to the 5th diode, described the first diode cathode connects described the 4th pin, negative pole connects described the first pin, described the second diode cathode connects described the 4th pin, negative pole connects described the 6th pin, described the 3rd diode cathode connects described the 3rd pin, negative pole connects described the second pin, described the 4th diode cathode connects described the 7th pin, negative pole connects described the 8th pin, described the 5th diode cathode connects described the 7th pin, negative pole connects described the 9th pin, and described the first diode, the negative pole of the second diode links to each other, described the 4th diode, the negative pole of the 5th diode links to each other.
Wherein, described the first pin be carrier detect pin, the second pin be receive data pin, the 3rd pin for send data pin, the 4th pin for judge data terminal whether ready pin, the 5th pin be signal ground pin, the 6th pin for judge data equipment whether ready pin, the 7th pin for request sends pin, the 8th pin is that pin is indicated in ring for allowing transmission pin, the 9th pin.
Compared to prior art, utilize com port loop-around test tool of the present utility model, because at described the 4th pin and described the first pin, described the 4th pin and described the 6th pin, described the 3rd pin and described the second pin all are provided with diode between described the 7th pin and described the 8th pin, described the 7th pin and described the 9th pin.Thereby so that the loop that forms between the pin of above-mentioned measurement jig, when the pin order of the com port of the PC that it is corresponding made a mistake, the signal of transmission can not obtain correct result, therefore can reach com port pin order correctness is tested.
[description of drawings]
Fig. 1 illustrates and is prior art com port loop-around test jig structure synoptic diagram.
Fig. 2 illustrates the structural representation into com port loop-around test tool of the present utility model one preferred embodiment.
[embodiment]
See also Fig. 1, Fig. 2 illustrates the structural representation into com port loop-around test tool of the present utility model one preferred embodiment.
In order to achieve the above object, the com port loop-around test tool that the utility model provides, in present embodiment, described measurement jig comprises:
The first to the 9th pin (1～～9), the respective pins on its corresponding described com port;
The first to the 5th diode (21～～25), described the first diode 21 positive poles connect described the 4th pin 4, negative pole connects described the first pin 1, described the second diode 22 positive poles connect described the 4th pin 4, negative pole connects described the 6th pin 6, described the 3rd diode 23 positive poles connect described the 3rd pin 3, negative pole connects described the second pin 2, described the 4th diode 24 positive poles connect described the 7th pin 7, negative pole connects described the 8th pin 8, described the 5th diode 25 positive poles connect described the 7th pin 7, negative pole connects described the 9th pin 9, and described the first diode 21, the negative pole of the second diode 22 links to each other, described the 4th diode 24, the negative pole of the 5th diode 25 links to each other.
Wherein, described the first pin 1 be carrier detect pin, the second pin 2 for receive data pin, the 3rd pin 3 for send data pin, the 4th pin 4 for judge data terminal whether ready pin, the 5th pin 5 for signal ground pin, the 6th pin 6 for judge data equipment whether ready pin, the 7th pin 7 for request sends pin, the 8th pin 8 is that pin is indicated in ring for allowing transmission pin, the 9th pin 9.
When test, because at described the 4th pin 4 and described the first pin 1, described the 4th pin 4 and described the 6th pin 6, described the 3rd pin 3 and described the second pin 2 all is provided with diode (being respectively 21～～25) between described the 7th pin 7 and described the 8th pin 8, described the 7th pin 7 and described the 9th pin 9.Thereby so that the loop that forms between the pin of above-mentioned measurement jig (the 4th pin 4, the first pin 1,6 formation of the 6th pin loop, 2 of the 3rd pin 3 and the second pins form the loop, the 7th pin 7, the 8th pin 8,9 of the 9th pins form the loop), the pin of the com port of the PC that it is corresponding, when if order makes a mistake, behind the transmitted test signal, because the forward conduction characteristic of diode, thereby can not obtain feeding back correct result, thereby can reach com port pin order correctness is tested.
More than take RS-232 as example, certainly, similarly interface also can adopt this kind loop-around test tool to test when doing loop-around test, just does on the line corresponding adjustment and gets final product.
Claims (2)
1. com port loop-around test tool is characterized in that described measurement jig comprises:
The tool body, its corresponding described com port;
The first to the 9th pin, the respective pins on its corresponding described com port;
The first to the 5th diode, described the first diode cathode connects described the 4th pin, negative pole connects described the first pin, described the second diode cathode connects described the 4th pin, negative pole connects described the 6th pin, described the 3rd diode cathode connects described the 3rd pin, negative pole connects described the second pin, described the 4th diode cathode connects described the 7th pin, negative pole connects described the 8th pin, described the 5th diode cathode connects described the 7th pin, negative pole connects described the 9th pin, and described the first diode, the negative pole of the second diode links to each other, described the 4th diode, the negative pole of the 5th diode links to each other.
2. com port loop-around test tool as claimed in claim 1, it is characterized in that, described the first pin be carrier detect pin, the second pin be receive data pin, the 3rd pin for send data pin, the 4th pin for judge data terminal whether ready pin, the 5th pin be signal ground pin, the 6th pin for judge data equipment whether ready pin, the 7th pin for request sends pin, the 8th pin is that pin is indicated in ring for allowing transmission pin, the 9th pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220422381 CN202794419U (en) | 2012-08-24 | 2012-08-24 | COM port loopback test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220422381 CN202794419U (en) | 2012-08-24 | 2012-08-24 | COM port loopback test fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202794419U true CN202794419U (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220422381 Expired - Fee Related CN202794419U (en) | 2012-08-24 | 2012-08-24 | COM port loopback test fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202794419U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630790A (en) * | 2012-08-24 | 2014-03-12 | 神讯电脑(昆山)有限公司 | COM port loop test fixture |
-
2012
- 2012-08-24 CN CN 201220422381 patent/CN202794419U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630790A (en) * | 2012-08-24 | 2014-03-12 | 神讯电脑(昆山)有限公司 | COM port loop test fixture |
| CN103630790B (en) * | 2012-08-24 | 2016-09-07 | 神讯电脑(昆山)有限公司 | COM port loop test fixture |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20170824 |