Serial Port and MSC1200

Hello, I´m tried connect the serail port at MSC1200 microcontroller. The program performed perfect, but no message is show in string variable.
Anybody know works with any project like this?
Attachments:
programa.JPG ‏60 KB

I guess it's not perfect if you don't get any data.
You have an indicator for number of bytes read. Is it greater than 0? If it's not, then the reason the string is empty is because there was nothing in the serial port buffer to read. Is the micro constantly sending out data? Have you tried using Hyperterminal to read the micro. If it is constantly transmitting, then the Hyperterminal scree will just fill up as long as you are connected. If the micro requires you to first send a command to request data, then you need to do a VISA Write of that command before doing the read.

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Dora0512 wrote:
Thanks for you all. My partner got it already.
I am doing send sms part.
Can anyone tell me why my program is not so steadily?
It means this program can run. But somtimes I cannot receive sms. sometimes can
Basically, it is not well-written from both a LabVIEW and a communications point of view. Unfortunately, I can't elaborate because today is an exrtremely busy day at work. I'm hoping this bump will prompt someone to help you with your problem. If you could also provide us with the programmer's guide or the manual for your equipment, that would be extremely helpful.
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"Example on reading combined signals from a serial port and separating them for display purposes". I am a beginner in Labview and would appreciate if anyone help with that

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Reading the serial port will give you a string. How you divide the channels depends on how the data was formatted before it was sent over the serial channel.
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Write to serial port and digital port at the same time

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I need to write to the digital port and the serial port at the same time. Right now I have the two vi's (to write to the serial port, write to the digital port) in the sequence structure. First I write the digital port, then write the serial port. Using the oscilloscope, the interval between these two executions is 10 ms; and I need to reduce this interval to as small as possible. I would appreciate help in any way. Thank you.

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This is a little tricky. Since the transition from one sequence to another is completely Software timed, and windows manages all tasks that are running at one given time, there isn't a method to reduce that transition time.
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Hey jpvans,
I would first suggest using NI-VISA to talk to the serial port. Then, you can use the LabVIEW Type Cast or the Flatten to String and UnFlatten From String VIs to convert the data.
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Hi,
You need to figure out when the serial port sample occured by some technique and then obtain the equivalent sample from the aquisition board, probably from a circular buffer. If you know the sample rate (pretty implicit really) you can 'cherry pick' the appropriate measurement from the buffer to be synchronus with the serial port measurement.

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Thanks for you all. My partner got it already.
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I have a custom h/w which reads the data from GPS Rx and after parsing send it to PC over RS232.
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Fulctionality of different loops are as following:
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Attachments:
Telemetry_Receiver_v2.zip ‏3075 KB

One of the most common problems in serial communication is the need for an adequate timing: how much time is expected your device to spend before answering? Have you put and adequate pause in your code before reading from the serial port?
Hope this helps
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Reading ascii codes from serial port and plotting them

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I am trying to build a VI that reads data (ascii values) from the serial port.
I am trying to build a wireless phonocardiogram. I have a microphone that acquires heart sounds. these signals are amplified and sent to a A/D converter to digitize them. the digital signal are sent to a base unit. The digitals signals received at the base unit have to be sent to a computer (over a serial port to view them).
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Thanks in advance.....
Solved!
Go to Solution.

Hi chaitu209
What is your transmission speed, samplerate, and bandwidth needed in your project? The bandwidth of the serial port is somewhat limited. Let me give you an example
Say you are using 115200 Kbit per second as transmission speed, one start bit/stop bit and parity bit, and 8 bit data. This will give you 115200/11 bytes pr second as the maximum theoretical transfer rate/sample rate. But if you are using up to 16 bit AD your maximum samplerate will be 115200/(2x11). So my advise to you is to use a binary transfer protocol not ASCII based protocol. This is not a problem in Labview with serial transmission.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

Serial Port and light LED

I have build a device for the serialPort(COM2) This device use the pin 2 and 3. Ok. Now, my question is:
To light this one LED, is it enough to open the serial port?
Thanks
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This won't work. Pins 2 and 3 are for sending data (2 is transmit, and 3 is receive.) You would be much better off using pins 5 (9-pin connector) or 7 (25-pin connector) for GROUND and then using DTR (pin 4 on 9-pin and pin 20 on 25-pin) as your signal. This will give you a 12V difference between the pins - you'll need a resister in series with the LED as well (from memory, LEDs aren't very happy with 12V over them for long.)
There may, or may not be enough current to drive the LED as well. And you'll have to get the polarity correct.
As for the software, if you simple open the port then DTR will raise giving you a signal.

How to configure visa to adquire dat from serial port and then converted to numeric value from a home embedded device

I already stablish communication with my serial port using VISA, selecting COM1 as the resoure name.
After that, I tried to read the data from the port (as we know the data was in string format )but I need to convert the data to numeric value to hadle it (no arrays).
Another main thing is that I'm develoing a new based Embedded design and tthe info that will trhow out from the device to the PC is binary.
How can I solved the problem, and if I want to make bidirectional communication with my system how can I do it? The VISA intructions as *IDN? and so forthetc can be recognize by the external system if the COM1 port is recognized by NI Max as ADSRL1::I
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Hello,
For an example of bidirectional serial communication in LabVIEW, please see the shipping example LabVIEW <-> Serial.vi. This can be found from LabVIEW by going to Help >> Find Examples. From the example finder, select Hardware Input and Output >> Serial >> LabVIEW <-> Serial.vi.
Once you are able to read the string data in, you can use the VIs in the String/Number Conversion palette to convert the data to numeric format. To access these, right-click on the block diagram >> All Functions >> String >> String/Number Conversion.
Let me know if this does not help.
Regards,
Sean C.
Applications Engineer
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How to read serial port and substring

I am new for labview .I send data from microcontroller with C languange every 1 minute this codeprintf("T%3.2f,H%3.2f",fTemp_true,fRh_true);
And I read data with Hyperterminal it show this T29.11,H67.88 I want to show 29.11 and 67.88 only and stroe in database. I study connect serial port in example and I have a question. If I use this code.Can I auto read every 1 minute or this code can read 1 time only and I have to click every 1 minute.How to auto read when I send data to serial port with microcontroller every 1 minute. And I cannot substring 29.11 and 67.88 because %3.2f can show T29.11,H67.88 or T129.11,H100 . and How can I simple send data to database. Thank you .

No, you don't have to click run every minute. You just need to place a while loop around the VISA Read. You could use Wait (ms) but it would be better to use something like the Elapsed Time function and wire the time has elapsed output to a case statement with the VISA Read inside the true case.
This is one way to parse the string:
If you have the database connectivity toolkit, you can easily write to a database. There is also something called LabSQL.
Message Edited by Dennis Knutson on 01-22-2010 01:42 PM
Attachments:
Parse String.png ‏16 KB

SERIAL PORT and PC COMMUNICATION And Arrays

I Made RF transmitter and receiver. I'm taking data from rs232 port and I can make monitor in Hyper Terminal or RS232 Analyzer. I want to make monitor in Labview. I can see DATA in labview. but İt is coming so slowly and while byte count 10, Labview take 10 bytes after then data is slide. For example;
First coming 127127225 after 271272251 after that 712722512 after that 127127225
I want to take data as seperate and ı want to give name to data. for example;
Pulse = 127 ; OXYGEN Saturation = 127 ; Temperature Room = 22.5
What can I do? Am I use should array? Thank you...

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Simultaneous execution of time critical parts(one is the drive connected to serial port and the other is the DAQ) in a vi

We are developing a software for a cyclic spin test using Drive.
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I`m not sure how the serial VIs affect the mutithreading of the LabVIEW environment, but setting LabVIEW to run multithreaded and running the two operations independent of each other (in two while loops without data-dependency between them) might do it. You will find the option for multithreading under "options". Bear in mind that a re-start of LabVIEW is necessary before the changes come into effect.
I would time-stamp the reply of the drive with the time of the request, not after receiving the data.
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Serial Port and MSC1200

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