CN202306535U - Fixture for testing RS (Recommended Standard)-232 interface - Google Patents

Abstract

The utility model discloses a fixture for testing an RS (Recommended Standard)-232 interface. The RS-232 interface comprises nine pins from a first pin to a ninth pin, and the fixture comprises a fixture body, nine ports from a first port to a ninth port and three resistors from a first resistor to a third resistor, wherein the shape of the fixture body corresponds to that of the RS-232 interface; the nine ports correspond to the nine pins in sequence, the first port, a fourth port and a sixth port are connected through guide lines, a seventh port, an eighth port and the ninth port are connected through the guide lines, and a second port and a third port are connected through the guide lines; and one ends of the three resistors are respectively connected with whole bodies of the first port, the fourth port and the sixth port, the whole bodies of the seventh port, the eighth port and the ninth port, or the whole bodies of the second port and the third port in sequence, and the other ends of the three resistors are connected with a fifth port. On one hand, a needed resistance range can be guaranteed to be covered by the test-passed RS-232 interface, and on the other hand, the test process can be more convenient and quicker.

Description

RS-232 interface test fixture

【Technical field】

The utility model relates to an RS-232 interface test fixture, in particular to an RS-232 interface test fixture with accurate test results and convenient testing.

【Background technique】

The full name of the RS-232 standard is the EIA-RS-232 standard, where EIA (Electronic Industry Association) stands for the American Electronics Industry Association, RS (recommended standard) stands for the recommended standard, and 232 is the identification number. It specifies connecting cables and mechanical, electrical characteristics, signal functions and transmission processes.

Current personal computers (notebook computers and desktop computers) are equipped with RS-232 interfaces, please refer to FIG. 1 , which is a schematic structural diagram of the RS-232 interface. The RS-232 interface includes: a first pin 1 (Data carrier detect, DCD; carrier detection), a second pin 2 (Receive data, RXD; receiving data), a third pin 3 (Transmit data, TXD; send data), fourth pin 4 (Data terminal ready, DTR; data terminal ready), fifth pin 5 (Signal ground, GND; signal ground), sixth pin 6 (Data set ready, DSR; data device Ready), seventh pin 7 (Request to send, RTS; request to send), eighth pin 8 (Clear to send, CTS; allow sending), ninth pin 9 (Ring Indicator, RI; ringing indication ).

At present, the test on the RS-232 interface mainly includes the test on the protocol and the test of the load capacity. The test on the protocol includes: connecting the first pin 1, the fourth pin 4 and the sixth pin 6 to test whether the data terminal and data equipment are ready; connecting the seventh pin 7 and the eighth pin Connect the pin 8 and the ninth pin 9 to test the request sending and permission sending; connect the second pin 2 and the third pin 3 to test the data transmission and data reception. The test software is installed in the personal computer.

Test fixtures are currently used to perform tests on the above protocols. Please refer to FIG. 2 . FIG. 2 is a schematic structural diagram of the prior art RS-232 interface test fixture. The jig includes a first port 10 to a ninth port 90 corresponding to the above-mentioned first pin 1 to ninth pin 9 . The first port 10, the fourth port 40 and the sixth port 60 are connected by wires; the seventh port 70, the eighth port 80, and the ninth port 90 are connected by wires; the second port 20, the third port 30 are connected by wires. When in use, the jig is inserted into the RS-232 interface, so that the above-mentioned connection between the above-mentioned pins can be achieved through the corresponding connection between the ports and the pins.

As for the test of load capacity, RS-232 mouse or other equipment is used for testing at present. The test requirement is that the voltage at the receiving end is within ±3 volts to ±12 volts when the load is 300 ohms to 10 megohms. We know that the equivalent resistance of the RS-232 mouse may be several thousand ohms, and the voltage obtained by inserting the RS-232 mouse into the RS-232 interface for testing does not ensure that the load test within the above-mentioned demand range can pass. . Various loads actually required cover the above-mentioned resistance value range.

In addition, in the current method, the test on the protocol and the test of the load receiving capacity are carried out in two parts, which is relatively inconvenient to operate.

In view of this, it is necessary to develop a RS-232 interface test fixture to solve the above problems.

【Content of invention】

Therefore, the purpose of this utility model is to provide a kind of RS-232 interface test fixture, can ensure that the RS-232 interface that the test passes on the one hand can cover the required resistance range, on the other hand can make the testing process more convenient and fast.

In order to achieve the above object, the RS-232 interface test fixture provided by the utility model, the RS-232 interface includes the first to ninth pins, and the fixture includes:

The jig body has a shape corresponding to the RS-232 interface;

The first to ninth ports correspond to the above-mentioned first to ninth pins in sequence, the first port, the fourth port and the sixth port are connected by wires, the seventh port, the eighth port, the ninth port The ports are connected by wires, and the second port and the third port are connected by wires;

A first resistor, one end of which is connected to the whole connected by the first, fourth, and sixth ports, and the other end of the first resistor is connected to the fifth port;

A second resistor, one end of which is connected to the whole connected to the seventh, eighth, and ninth ports, and the other end of the second resistor is connected to the fifth port;

A third resistor, one end of which is connected to the whole connected by the second and third ports, and the other end of the third resistor is connected to the fifth port.

Optionally, the signal names corresponding to the first to ninth pins in sequence are: carrier detection, receiving data, sending data, data terminal ready, signal ground, data device ready, request to send, permission to send, vibration bell indication.

Optionally, the first resistor, the second resistor and the third resistor are dummy loads.

Optionally, the equivalent resistance values of the first resistor, the second resistor and the third resistor are respectively 300 ohms.

Compared with the prior art, using the RS-232 interface test fixture of the present utility model, on the one hand, due to the use of the first to third resistors with a certain resistance value, the RS-232 interface that passes the test can be ensured through the limitation of the resistance value. It can cover the required resistance range; on the other hand, since the resistance is added to the test fixture, the load capacity can be tested together by connecting the fixture, which makes the test process more convenient and faster.

【Description of drawings】

Figure 1 is a schematic diagram of the structure of the RS-232 interface

FIG. 2 is a schematic structural diagram of the prior art RS-232 interface test fixture.

FIG. 3 is a schematic structural diagram of the RS-232 interface test fixture of the present invention.

【Detailed ways】

Please refer to FIG. 1 and FIG. 3 together. FIG. 3 is a schematic structural diagram of the RS-232 interface test fixture of the present invention.

In order to achieve the above object, the RS-232 interface test fixture provided by the utility model, the RS-232 interface includes the first pin 1 ~ ~ the ninth pin 9 (as shown in Figure 1), the fixture includes:

The jig body has a shape corresponding to the RS-232 interface;

The first port 100 to the ninth port 900 correspond to the first pin 1 to the ninth pin 9 in sequence, and the first port 100, the fourth port 400 and the sixth port 600 are connected by wires, The seventh port 700, the eighth port 800, and the ninth port 900 are connected by wires, and the second port 200 and the third port 300 are connected by wires;

A first resistor 101, one end of which is connected to the whole connected by the first port 100, the fourth port 400 and the sixth port 600, and the other end of the first resistor 101 is connected to the fifth port 500;

The second resistor 102, one end of which is connected to the whole connected by the seventh port 700, the eighth port 800, and the ninth port 900, and the other end of the second resistor 102 is connected to the fifth port 500;

One end of the third resistor 103 is connected to the whole formed by the connection of the second port 200 and the third port 300 , and the other end of the third resistor 103 is connected to the fifth port 500 .

Wherein, the signal names corresponding to the first pin 1 to the ninth pin 9 in sequence are: carrier detection, receiving data, sending data, data terminal ready, signal ground, data device ready, request to send, allow Sending, ringing indication.

Wherein, the first resistor 101 , the second resistor 102 and the third resistor 103 may be dummy loads.

Wherein, the equivalent resistance values of the first resistor 101 , the second resistor 102 and the third resistor 103 are respectively 300Ω.

Compared with the prior art, adopting the RS-232 interface test fixture of the present utility model, on the one hand, due to the use of the first resistor 101, the second resistor 102 and the third resistor 103 with determined resistance values, the resistance value It can ensure that the RS-232 interface that passes the test can cover the required resistance range; on the other hand, since the resistance is added to the test fixture, the load capacity can be tested together by connecting the fixture, so that the test The process is more convenient and faster.

Claims (4)

1. A kind of RS-232 interface test fixture, this RS-232 interface comprises first to ninth pin, it is characterized in that, this fixture comprises: The jig body has a shape corresponding to the RS-232 interface; The first to ninth ports correspond to the above-mentioned first to ninth pins in sequence, the first port, the fourth port and the sixth port are connected by wires, the seventh port, the eighth port, the ninth port The ports are connected by wires, and the second port and the third port are connected by wires; A first resistor, one end of which is connected to the whole connected by the first, fourth, and sixth ports, and the other end of the first resistor is connected to the fifth port; A second resistor, one end of which is connected to the whole connected to the seventh, eighth, and ninth ports, and the other end of the second resistor is connected to the fifth port; A third resistor, one end of which is connected to the whole connected by the second and third ports, and the other end of the third resistor is connected to the fifth port. 2. The RS-232 interface test fixture according to claim 1, wherein the signal names corresponding to the first to ninth pins in sequence are: carrier detection, receiving data, sending data, data terminal preparation OK, signal ground, data device ready, request to send, permission to send, ringing indication. 3. The RS-232 interface test fixture according to claim 1, wherein the first resistor, the second resistor and the third resistor are dummy loads. 4. The RS-232 interface test fixture according to claim 1, wherein the equivalent resistance values of the first resistor, the second resistor and the third resistor are respectively 300 ohms.

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