CN1959651A - Device for testing RS232 ports - Google Patents
Device for testing RS232 ports Download PDFInfo
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- CN1959651A CN1959651A CN 200510100962 CN200510100962A CN1959651A CN 1959651 A CN1959651 A CN 1959651A CN 200510100962 CN200510100962 CN 200510100962 CN 200510100962 A CN200510100962 A CN 200510100962A CN 1959651 A CN1959651 A CN 1959651A
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- port
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Abstract
A test device of RS232 port consists of a connector including a data input pin, a data output pin and grounding pin, and a load circuit. It is featured as connecting said grounding pin to ground and connecting said load circuit between data input pin and data output pin both on said connector.
Description
[technical field]
The invention relates to a kind of proving installation, be meant a kind of RS232 port testing device especially.
[background technology]
Computer and external unit be connected and multiple interfaces and signal transmission form have been used in the signal transmission, these interfaces and signal transmission form can incorporate two kinds of communications protocol respectively into: serial communication protocol and parallel communication agreement.
Serial communication protocol has a variety of, for example RS-232-C, RS-485 and RS-422 etc., even popular now USB etc. is a serial communication protocol.And the application of technology of serial communication is ubiquitous especially, and everybody is modal to be exactly the serial ports of computer and the communication between Modem, even mobile phone, PDA, USB mouse and keyboard etc. all are that mode with serial communication is connected with computer.
RS-232-C (claiming EIA RS-232-C again, hereinafter to be referred as RS232) is by EIA (EIA) associating Bell System, the common standard of formulating that is used for serial communication of modulator-demodular unit producer and terminal manufacturer in 1970.RS232 is the communications protocol of a full duplex, and it can carry out the work of Data Receiving and transmission simultaneously.The port of RS232 has two kinds usually: 9 pins (DB9) and 25 pins (DB25).
The RS232 port is the port of all computing machine indispensabilities, and it can connect FAX/MODEM equipment, serial mouse, serial keypad, acquisition module and PLC etc., can also connect the RS232-RS485 adaptor sub, the control RS485 network equipment.With reference to figure 1, the RS232 port extensively adopts 9 core D type joints (DB9), and it has, and wiring is simple, transfer rate is high, pass advantages such as data are reliable.Except the efficient data transmission of Tx/Rx mode, the RS232 interface also possesses direct I/O I/O capability.
Reference table 1 is the definition of RS232DB9 port pinout.The common communication modes of RS232 port is a three-wire type, and this mode is that the transmitting terminal of two RS232 equipment (TXD) and receiving end (RXD) and earth terminal (GND) are connected to each other.This mode couples together 2 and 3,3 and 2 and 5 and 5 pins of the RS232 interface at two ends respectively.Most RS232 port device can be coupled together with three-wire type.
The definition of table 1 RS232DB9 port pinout
| Pin number | Title | Describe | I/ |
| 1 | DCD | Data carrier detect | Input |
| 2 | RXD | Receive data | Input |
| 3 | TXD | Send data | Output |
| 4 | DTR | Data terminal is prepared | Output |
| 5 | GND | Ground connection | --- |
| 6 | DSR | Transceive data is prepared | Input |
| 7 | RTS | Request sends | Output |
| 8 | CTS | Clear to send | Input |
| 9 | RI | Call entry | Input |
Maximum load capacitance according to regulation RS232 port in the RS232 standard can not surpass 2500PF, because drive end has comprised the load capacitance value of about 50pF, therefore total external load capacitance value should be less than 2450pF.Computer manufacturer is in computer production and research and development, all need computer RS232 port is carried out measuring signal integrality, this test normally connects the RS232 port of computer to be measured and the RS232 port of an auxiliary computer by the single line cable, send a data-signal to computer to be measured by auxiliary computer, measure signal at the RXD pin of computer RS232 port to be measured and the TXD pin place of auxiliary computer RS232 port, the gained signal is compared, determine the integrality of computer RS232 port received signal to be measured, judge by this whether computer RS232 port to be measured is normal, used cable is long about 15 meters in this test, so that load capacitance near maximal value, makes the decay of signal reach maximum.This test process is loaded down with trivial details, and need take an auxiliary computer, and the load capacitance value of cable can't guarantee to reach the maximum load capacitance, causes test result inaccurate.
[summary of the invention]
In view of above content, be necessary to provide a kind of RS232 port testing device, with the test process of the RS232 port of simplifying computer.
A kind of RS232 port testing device, it comprises an a connector and a load circuit, described connector comprises a data input pin, a data output pin and a grounding pin, described grounding pin ground connection, described load circuit are connected between the data input pin and data output pin of described connector.
Compare existing method of testing, described RS232 port testing device has replaced traditional cable with a load circuit, has guaranteed the degree of accuracy of load capacitance, makes the measuring signal integrality result more accurate, and do not need to be connected and to finish test, save testing cost with auxiliary computer.
[description of drawings]
The present invention is further illustrated in conjunction with embodiment with reference to the accompanying drawings.
Fig. 1 is existing RS232DB9 port synoptic diagram.
Fig. 2 is the circuit diagram of RS232 port testing device better embodiment of the present invention.
[embodiment]
With reference to figure 2, it is the circuit diagram of RS232 port testing device better embodiment of the present invention, one RS232 port testing device 10, it comprises an a connector 12 and a load circuit 14, described connector 12 is a RS232DB9 socket, it comprises a data input pin DATAIN, a data output pin DATAOUT and a grounding pin GND, the data input pin DATAIN of described connector 12 is connected with described data output pin DATAOUT by described load circuit 14, constitute a signal transmission loop, described grounding pin GND ground connection.
Described load circuit 14 is composed in parallel by 13 capacitor C1～C13, because the electric capacity total value of load circuit 14 is not more than 2450pF, so the capacitance of described capacitor C1～C12 is 200pF, the capacitance of described capacitor C13 is 50pF.
When a computer RS232 port to be measured is carried out measuring signal integrality, after described RS232 port testing device 10 being installed on the RS232 port of described computer to be measured, one data-signal sends via the TXD pin of described computer RS232 port to be measured, described data-signal is imported described RS232 port testing device 10 via described data input pin DATAIN, by passing computer to be measured back through the RXD pin of described data output pin DATAOUT and computer RS232 port to be measured again after described load circuit 14 decay, by this, do not need to connect other computer with cable again, described RS232 port testing device 10 can constitute the signal transmission loop of computer RS232 port to be measured, and provide load capacitance for computer RS232 port to be measured by described load circuit 14, can on the data input pin DATAIN of described connector 12 and data output pin DATAOUT, measure required test data this moment and compare, to judge the integrality of computer RS232 port received signal to be measured.Compare existing method of testing, described RS232 port testing device has replaced traditional cable with a load circuit, has guaranteed the degree of accuracy of load capacitance, makes the measuring signal integrality result more accurate, and do not need to be connected and to finish test, save testing cost with another computer.
Claims (5)
1. RS232 port testing device, it is characterized in that: described RS232 port testing device comprises an a connector and a load circuit, described connector comprises a data input pin and a data output pin, and described load circuit is connected between the data input pin and data output pin of described connector.
2. RS232 port testing device as claimed in claim 1 is characterized in that: described connector also comprises a grounding pin, described grounding pin ground connection.
3. RS232 port testing device as claimed in claim 1 is characterized in that: described connector is a RS232 nine kinds of needles socket.
4. RS232 port testing device as claimed in claim 1 is characterized in that: described load circuit is composed in parallel by some capacitors.
5. RS232 port testing device as claimed in claim 4 is characterized in that: the electric capacity total value of described capacitor is no more than 2450pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101009625A CN100383752C (en) | 2005-11-02 | 2005-11-02 | Device for testing RS232 ports |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101009625A CN100383752C (en) | 2005-11-02 | 2005-11-02 | Device for testing RS232 ports |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1959651A true CN1959651A (en) | 2007-05-09 |
| CN100383752C CN100383752C (en) | 2008-04-23 |
Family
ID=38071353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101009625A Expired - Fee Related CN100383752C (en) | 2005-11-02 | 2005-11-02 | Device for testing RS232 ports |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100383752C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101364199B (en) * | 2007-08-06 | 2012-01-18 | 鸿富锦精密工业（深圳）有限公司 | Serial communication monitoring system and monitoring equipment |
| CN102339250A (en) * | 2010-07-16 | 2012-02-01 | 鸿富锦精密工业（深圳）有限公司 | Mainboard signal testing device |
| CN103034573A (en) * | 2011-10-10 | 2013-04-10 | 神讯电脑(昆山)有限公司 | RS-232 interface test fixture |
| CN103365752A (en) * | 2012-04-11 | 2013-10-23 | 鸿富锦精密工业(武汉)有限公司 | Test device |
| CN103630790A (en) * | 2012-08-24 | 2014-03-12 | 神讯电脑(昆山)有限公司 | COM port loop test fixture |
| CN112198422A (en) * | 2020-10-19 | 2021-01-08 | 南京宏泰半导体科技有限公司 | High-speed signal frequency measurement and signal integrity test method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1118754C (en) * | 1999-05-17 | 2003-08-20 | 英业达股份有限公司 | Module and method for testing communication port |
| US6807504B2 (en) * | 2002-11-21 | 2004-10-19 | Via Technologies, Inc. | Apparatus for testing I/O ports of a computer motherboard |
| CN1504887A (en) * | 2002-12-02 | 2004-06-16 | 英业达股份有限公司 | Testing device and method for universal serial bus port |
| US6956387B2 (en) * | 2003-08-15 | 2005-10-18 | Intel Corporation | Socket connection test modules and methods of using the same |
-
2005
- 2005-11-02 CN CNB2005101009625A patent/CN100383752C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101364199B (en) * | 2007-08-06 | 2012-01-18 | 鸿富锦精密工业（深圳）有限公司 | Serial communication monitoring system and monitoring equipment |
| CN102339250A (en) * | 2010-07-16 | 2012-02-01 | 鸿富锦精密工业（深圳）有限公司 | Mainboard signal testing device |
| CN103034573A (en) * | 2011-10-10 | 2013-04-10 | 神讯电脑(昆山)有限公司 | RS-232 interface test fixture |
| CN103365752A (en) * | 2012-04-11 | 2013-10-23 | 鸿富锦精密工业(武汉)有限公司 | Test device |
| 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 |
| CN112198422A (en) * | 2020-10-19 | 2021-01-08 | 南京宏泰半导体科技有限公司 | High-speed signal frequency measurement and signal integrity test method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100383752C (en) | 2008-04-23 |
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Granted publication date: 20080423 Termination date: 20101102 |