CN105553628A - Method and device for detecting serial communication baud rate - Google Patents
Method and device for detecting serial communication baud rate Download PDFInfo
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- CN105553628A CN105553628A CN201510880724.4A CN201510880724A CN105553628A CN 105553628 A CN105553628 A CN 105553628A CN 201510880724 A CN201510880724 A CN 201510880724A CN 105553628 A CN105553628 A CN 105553628A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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Abstract
The invention relates to a method and device for detecting serial communication baud rate. The device comprise a programmable logic device which is configured with a data validity detector and a data width counter. The data validity detector is used for detecting whether an input signal of a communication device is in an idle state and determining whether the input signal of the communication device is in an effective state. When the data valid signal of the data validity detector is detected by the data width counter as being in an effective state, counting is started. According to the method, the time for character transmission is determined through detecting the validity of received signal of the communication device, and the baud rate is determined through measuring the transmitted character width of the serial communication. According to the device, there is no need to measure consumption time of data flow bits, the configuration requirement of a device is reduced, baud rate of an unknown device is quickly detected, and great convenience is brought for users.
Description
Technical field
The invention belongs to the communications field, be specifically related to a kind of serial communication baud rate detection method and device.
Background technology
In Industry Control, telecommunications dispatch control system and in some other equipment; the serial communication interfaces such as RS232/422/485 often can be used as control desk or monitor-interface; in use, do not know communication apparatus work baud rate sometimes and the running parameter of system cannot be correctly set.Whenever running into this situation, conventional method is looked for specification to check or looks for designer to inquire or attempt the baud rate commonly used one by one, and this method brings a lot of inconvenience to the use of communication apparatus.
Existing communication apparatus baud rate detection method is the time that the position by measuring communication apparatus Received signal strength consumes, obtain communication baud rate, thus require that checkout gear has high precision clock, as the patent documentation " a kind of Multi-path serial communication interface baud rate automatic-detection circuit and method " that application number is 201010614318.0, and the patent documentation " detecting the UART device and detection method to set up thereof that arrange function with baud rate " that application number is 200910065713.5 discloses a kind of by detecting rising edge, trailing edge determines data flow position, thus the data width in calculating setting-up time, due to rising edge and trailing edge will be judged, also require that checkout gear has high precision clock, so, high to the configuration requirement of device.
Summary of the invention
The invention provides a kind of serial communication baud rate detection method and device, require that checkout gear has the problem of high precision clock to solve existing communication apparatus baud rate detection method.
For solving the problems of the technologies described above, serial communication baud rate checkout gear of the present invention comprises a programmable logic device, described programmable logic device is configured with data valid detector and data width counter, described data valid detector detects whether communication apparatus input signal is idle condition, judge whether communication equipment input signal is " effectively " state, when described data width counter detects that the data valid signal of data valid detector is for " effectively " state, starts counting.
This device also comprises communication baud rate multilevel iudge device, and described communication baud rate multilevel iudge device is according to the count value of data width counter, and multilevel iudge goes out communication baud rate.
This device is arranged in the interface of supervisory control comuter.
Serial communication baud rate detection method comprises
1) carry out write operation to data valid detector corresponding data position, log-on data valid detector detects communication equipment Received signal strength;
2) carry out read operation to data valid detector corresponding data position, if the data valid signal of data valid detector is " effectively " state, data width rolling counters forward, until the data valid signal of data valid detector is engineering noise state;
3) read operation is carried out to data width counter corresponding data position, obtain the width gauge numerical value of data word, after comparison, judge the baud rate of communication equipment.
Described data valid detector comprises the step that communication equipment Received signal strength detects:
A) data valid signal is set to engineering noise state, detects and starts;
B) judge whether communication apparatus Received signal strength is idle condition, if not, then waits for, otherwise, carry out step c);
C) judge whether communication apparatus Received signal strength is effective status, if fruit is no, then wait for, otherwise data valid signal is set to " effectively " state;
D) continue to judge whether communication apparatus Received signal strength is effective status, if so, then waits for, otherwise data valid signal is set to engineering noise state, detects and terminate.
Describedly judge that whether communication apparatus Received signal strength is the method for idle condition and is: interval according to the first predeterminated voltage, when communication apparatus reception voltage signal value is positioned at the first predeterminated voltage interval, judge that communication apparatus Received signal strength is idle condition.
Describedly judge that whether communication apparatus Received signal strength is the method for effective status and is: interval according to the second predeterminated voltage, when communication apparatus reception voltage signal value is positioned at the second predeterminated voltage interval, judge that communication apparatus Received signal strength is effective status.
When write operation is carried out to data width counter corresponding data position, first to carry out clear operation.
Method of the present invention and device by the validity detecting communication apparatus Received signal strength judge its transmit time needed for word, and by the measurement to serial communication transmission word width, thus judge its baud rate, this device does not need the elapsed time of measurement data stream position, also without the need to judging rising edge and the trailing edge of data flow, the size judging magnitude of voltage is only needed to calculate data width, do not require that checkout gear has high precision clock, reduce the configuration requirement to device, and the fast detecting achieved unknown communication apparatus baud rate, bring great convenience to user of service.
Accompanying drawing explanation
Fig. 1 is communication baud rate self-reacting device principle schematic of the present invention.
Embodiment
Below in conjunction with accompanying drawing, do bright in detail further to technical scheme of the present invention.
Serial communication baud rate checkout gear embodiment
As shown in Figure 1, the device of the present embodiment comprises a programmable logic device, is configured with data valid detector 1, data width counter 2 in described programmable logic device.Data valid detector detects whether communication apparatus input signal is idle condition, judge whether communication equipment input signal is " effectively " state, when data width counter detects that the data valid signal of data valid detector is for " effectively " state, starts counting.
Wherein, data valid detector is for detecting communication apparatus status input signal, and setting data useful signal position; , data width counter is used for according to data valid signal position, counts valid data width.
Baud rate checkout gear is located in the communication interface of supervisory control comuter.
This device is provided with communication baud rate multilevel iudge device, and for the count value according to data width counter, multilevel iudge goes out communication baud rate, can certainly carry out manpower comparing and comparatively obtain baud rate.
This device can arrange serial communication transceiver 3 in the programmable logic device, also can be other individual components.
Serial communication baud rate detection method embodiment
The method, based on above-mentioned detection device, specifically comprises the following steps:
(1) write operation is carried out to data width counter 2 corresponding data position, reset, data width counter 2 enters count status, if " data are effective " signal that data valid detector 1 is sent here is " effectively " state, then data width counter 2 counts until " data are effective " signal becomes engineering noise state;
(2) carry out write operation to data valid detector 1 corresponding data position, log-on data valid detector 1 pair of communication apparatus Received signal strength " Rx " is detected;
(3) read operation is carried out to data valid detector 1 corresponding data position, judge whether detection completes, if do not complete, then waits for, if complete, performs next step according to corresponding data bit;
(4) read operation is carried out to data width counter 2 corresponding data position, obtain the width gauge numerical value of data word, after comparison, judge the baud rate of communication apparatus.
The effective detecting step of data of described data valid detector 1 comprises:
(1) " data are effective " signal setting is engineering noise state, start detection;
(2) judge that now whether communication apparatus input signal " Rx " is idle condition, if not, then waits for, if it is carries out next step;
(3) judge that now whether communication apparatus input signal " Rx " is effective status, if not, then waits for, if it is carries out next step;
(4) " data are effective " signal setting is " effectively " state, judges that now whether communication apparatus input signal " Rx " is effective status, if so, then waits for, if otherwise carry out next step;
(5) data valid signal is set to engineering noise state, and detection completes.
The detection of " data are effective " signal is described for RS-232-C standard below:
EIA-RS-232C has made regulation to electrical characteristic, logic level and various holding wire function.On TxD and RxD:
Logical one (MARK)=-3V ~-15V
Logical zero (SPACE)=+ 3 ~+15V
Namely can judge currently whether have transfer of data by detecting the voltage of " Rx " signal.When voltage can think " free time " state between-3 ~+3V.
To the differentiation of baud rate based on following foundation:
The form of serial data is: start bit+data bit+parity check bit+position of rest, wherein start bit 1bit, data bit 5 ~ 8bit, check digit 0,1bit, position of rest 1,1.5 and 2bit.The transmission word length of a serial communication is 7 ~ 12, and word length is changed to 0.5.The common baud rate transmission time is in table 1.
After completing once-through operation, the value in sense data width counter 2, and according to time of this dataword transfer, comparatively corresponding baud rate can be obtained with the numeric ratio in table 1.
Table 1 different baud rate word transmission required time table
The present embodiment judges the length of a word at the free time in the middle of transmitting based on two words, inapplicable for leisureless transmission.
In addition, baud rate is that 10.5 in the transmission time and 57600 of 7 to 8bit words in 38400 is basically identical to the transmission time of 12bit word, in use needs the width in conjunction with data bit to judge, otherwise may cause erroneous judgement.
Claims (8)
1. a serial communication baud rate checkout gear, it is characterized in that, this device comprises a programmable logic device, described programmable logic device is configured with data valid detector and data width counter, described data valid detector detects whether communication apparatus input signal is idle condition, judge whether communication equipment input signal is " effectively " state, when described data width counter detects that the data valid signal of data valid detector is for " effectively " state, starts counting.
2. serial communication baud rate checkout gear according to claim 1, it is characterized in that, this device also comprises communication baud rate multilevel iudge device, and described communication baud rate multilevel iudge device is according to the count value of data width counter, and multilevel iudge goes out communication baud rate.
3. serial communication baud rate checkout gear according to claim 1, it is characterized in that, this device is arranged in the interface of supervisory control comuter.
4. adopt a serial communication baud rate detection method for device described in claim 1, it is characterized in that, the method comprises the steps:
1) carry out write operation to data valid detector corresponding data position, log-on data valid detector detects communication equipment Received signal strength;
2) carry out read operation to data valid detector corresponding data position, if the data valid signal of data valid detector is " effectively " state, data width rolling counters forward, until the data valid signal of data valid detector is engineering noise state;
3) read operation is carried out to data width counter corresponding data position, obtain the width gauge numerical value of data word, after comparison, judge the baud rate of communication equipment.
5. serial communication baud rate detection method according to claim 4, it is characterized in that, described data valid detector comprises the step that communication equipment Received signal strength detects:
A) data valid signal is set to engineering noise state, detects and starts;
B) judge whether communication apparatus Received signal strength is idle condition, if not, then waits for, otherwise, carry out step c);
C) judge whether communication apparatus Received signal strength is effective status, if fruit is no, then wait for, otherwise data valid signal is set to " effectively " state;
D) continue to judge whether communication apparatus Received signal strength is effective status, if so, then waits for, otherwise data valid signal is set to engineering noise state, detects and terminate.
6. serial communication baud rate detection method according to claim 5, it is characterized in that, describedly judge that whether communication apparatus Received signal strength is the method for idle condition and is: interval according to the first predeterminated voltage, when communication apparatus reception voltage signal value is positioned at the first predeterminated voltage interval, judge that communication apparatus Received signal strength is idle condition.
7. serial communication baud rate detection method according to claim 5, it is characterized in that, describedly judge that whether communication apparatus Received signal strength is the method for effective status and is: interval according to the second predeterminated voltage, when communication apparatus reception voltage signal value is positioned at the second predeterminated voltage interval, judge that communication apparatus Received signal strength is effective status.
8. serial communication baud rate detection method according to claim 5, is characterized in that, when carrying out write operation to data width counter corresponding data position, first will carry out clear operation.
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Cited By (4)
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| CN106788920A (en) * | 2016-12-19 | 2017-05-31 | 珠海格力电器股份有限公司 | Baud rate deviation detection method and device and air conditioner indoor unit |
| CN110266405A (en) * | 2019-05-10 | 2019-09-20 | 珠海格力电器股份有限公司 | Equipment communication signal deviation detecting system |
| CN113238974A (en) * | 2021-05-19 | 2021-08-10 | 青岛信芯微电子科技股份有限公司 | Bus bandwidth efficiency statistical method, device, equipment and medium |
| CN116760508A (en) * | 2023-08-18 | 2023-09-15 | 荣耀终端有限公司 | Baud rate setting method and system |
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