STOP CHARACTER

Similar Questions

• Change the stop character doesn't seem to work

  Hello world

  I hope that this will be a quick fix and I'm just on something stupid!

  In short, I'm doing a LabView program to control a pump syringe via RS - 232. I use a Keyspan USB serial adapter to connect my laptop to the device. After a repair on my own, I was able to download a program HyperTerminal and can communicate with my well pump (change of position, speed, during initialization, etc.). However, when I try to do the same thing with LabView, nothing happens.

  First of all, I can say that LabView sends my pump data, because the light on the USB-serial adapter flashes quickly once (its indication that it comes to Rx/Tx). The same thing happens when I communicate with him via the HyperTerminal program. He seems to be in working condition.

  After a lot of reading posts on this forum and developer of the examples, I think that the problem is to send a character of endpoint with my data string. For example, when I have the program HyperTerminal open, I can enter "/ 1ZR ', which will initialize the pump. That move the pump to its original position and prepares for further information. When I go into the properties of "stop character" in this software, it is said: '13,10"(with the quotes). As far as I know, 13 in decimal is a return carriage (or 0xD hex) and 10 is a line break. I don't know if it sends them both. The company says that my program does not work because my LabView program is probably not send the right stop character.

  I tried almost everything I can think of to change the stop character. I know that the VISA VI set up the Serial Port uses the same settings as my COM port shows when I open Control Panel (9600 baud rate, etc.). I had a big bang and thought that maybe I should check MAX and see what his settings are... they are the same. HOWEVER, when I open the "VISA test Panel" on MAX for my COM port, under "Settings/o", the stop character is set to line feed \n. I have change to \r carriage return, but when I click on "apply changes", I get this:

  SET to 0xD stop character
  No error

  And when I close the Panel test and re - open, always back to \n line break. I also tried to change the setting of "tank of termination" in the VISA set a Serial Port to a constant (as a 13) or control (which I tried like 0xD hex as well as 13 decimal).

  I'm fairly convinced it's the issue... If anyone has any idea on how I can force it to use a carriage return? I even tried to disable 'enable the separation tank' and manually compose a string with a \r at the end, but it does not work either...

  I have attached a photo of a simple VI which shows what I want to do (the 2000ms waiting was put there just so that he would not close the COM port before initialization completed... its useless I think).

  Thanks for your help in advance!

  B

  The stop character with the definition configuration function has absolutely nothing for adding a character of termination in writing. Look at the advanced example for how to do it. In addition, if you want to do with the string you enter, you must activate '-' code display. It is a right click option.

• stop character during the IV sweep with keithley 2600

  Hello.

  I have a labview code to make the IV scans on a solar cell.

  When I sweep V and I measure, it works great every time. Totally reproducible results.

  When I I sweep and measure V, I get randomly 410 interrupts with the vi printbuffer() when playing back the results.

  On the edge of survey error, I find the following details of the error.

  WARNING 1073676293 was held at VISA read in KE26XX.lvlibrint Buffer.vi-> sweepiv_test_2600.vi

  Possible reasons:

  VISA: (Hex 0x3FFF0005) the termination character was read.

  I disabled the stop character in him intialise Keithley 2600 vi, but the problem persists. The strange thing is that the code for the dredging of the V is exactly the same for I sweep (with obvious switches in the source and measurement).

  It seems that the levels of measurement/source are eventually go out of scope and causing the weatherstripping to end at the beginning. But even when I force ranges to a level that would deny such a problem, I always get the error intermittently.

  Any help would be greatly appreciated!

  You can change a property for the stop character node and allow stop character in port VISA.  It's under settings based on the Message.  However, I have not work with GPIB to know how he handles things rather than serial ports.  I don't have your Keithley VI to find out what's going on inside of them.

• Why do I get a warning "stop character has been read" with VISA read and TCPIP?

  I use VISA readings with raw sockets TCPIP without problem with NI-VISA 3.0.1 but when I moved to NI-VISA 4.4 I was getting timeout errors.   Time-out errors disappeared when I put the stop character allow the property (which seemed to be default in NI-VISA 3.0.1) but now I get a warning indicating that the "stop character was read.

  Can I turn off this warning?   Can I put the ending character activate by default?   How can I get rid of this annoying warning?

  Hey, Dagwood,.

  Unfortunately, there is not a way to globally change the attribute VI_ATTR_TERMCHAR_EN to VI_TRUE.  Talked with R & D ability to use registers and they say that it is not accessible through that.  To answer why this change was made so the developer who made the switch isn't around more I can not find his reasoning to explain.  The best to you in your code would be during initialization, use the node property VISA to make the change and until the closure of this VISA resource, this change will be the value that you assign the value.  I'm sorry, we cannot provide any other solution for these problems.  Also, if you feel that it is a heavy load on your programming practice you can certainly submit a product idea for the ability to change the overall values for default attributes VISA.

  Thank you

• Reading series: maybe stop character?

  Hi all

  I'm trying to use labview to plot the data I send from a pic microcontroller. I'm programming in c pic so I can quite easily format the output. More specifically, at this time I sent hexadecimal numbers in this format "xxxx" on the serial port. I used playback advanced series and writing vi sample, got rid of the portion of Scripture, added a hexadecimal string to convert to the number function and send the output to a graph. My problem is to get the numbers down. For example if I send the FFFF number sometimes he read _FFF sometimes it reads FFF_ F_FFF etc., when of course I want to tread FFFF. I don't know how to solve this problem. I spent a ton of time on this because sometimes it works perfectly if i ' ts frustrating because I can't figure out what to do.  I have the following settings

  2400 baud

  5 bytes read

  input buffer 5 bye (not really sure that it should be)

  no flow control

  endless, read about the stop character

  So I thought maybe I should add a termination character to my output, such as \n... but if I have it and labview to stop read the stop character as soon as he comes to \n it stops completely. I'm sorry if this post is not clear, please let me know if you need any information, I really had an incredible amount of time on it so that any help would be great

  
  

• Stop character does not Change

  Hello, I use vi to establish and send to a serial port. When I try and change the stop character on the front panel of 0xA (\n) to 0xD (\r) and try and scroll the vi that I find that the stop character constantly 0xA that is not what I want. What I am doing wrong.

  Nevica

  Hello

  Please use the terminal termination char on the VISA VI set up the Serial Port:

  

• TCP/IP visa write stop character

  Dear all,

  I did an application with LabView where I communicate to my instrument via RS232. I use the VISA command.

  This application works OK.

  Now, here's my problem, my instrument also have an ethernet interface, so I want to be able to communicate using TCP/IP socket.

  The problem is that I have not found in the properties of socket TCP/IP, an equivalent to the 'Mode' end for the Scriptures of the serial property.

  If I want my instrument understand that I send, I need to add a 0x0A character to the string sent. When I use the RS232 interface, this is done by "mode of end for the Scriptures.

  I would like to avoid manually adding a 0x0A when I connect by Ethernet in my entire program because it is quiet big.

  You have an idea?

  Thanks a lot for your help.

  Best regards

  The 'end' is defined in 488.2 as EOI which is actually one of the lines of control. This is why the help information are a little confusing for me. I know that with GPIB functions you can optionally add a LF or CR to the IDE and it is also something that can be set in MAX when you configure a GPIB card. According to me, the default value is not character and I looked for a VISA property that would do something similar, but did not find anything specific to change the character of 488 end. I was hoping that the stop character was the same thing but I don't think. I hope that someone with a deeper insight into the VISA will respond.

• Problem of communication series, ASRL end in zero votes and TermChar Enable false does not stop 0x0A character

  Hello

  I got in touch ok using VISA series read/write with a patient monitor and have almost finished getting all parameters in need of the monitor; However I am stuck now and is missing a value which is coded 0x0A.

  I googled and found that it is probably the message after this character, also yes I get the first 6 bytes or more.

  I subsequently put TermChar Enable false and end ASRL in None on the property node to read but still missing the additional (after the 0x0A) byte I need to calculate the necessary pararmeter.

  The attached picture shows the run configuration of VISA before the outside/front of the first major loop, then an inner loop where reading occurs. It seems that, even if I think I'll get the right pieces of the node property, I can't stop the playback stop character.

  Here, any help would be appreciated.

  Thank you

  I would recommend a configuration like this.  The idea is to read a byte at a time until the sync byte is found.  Then you read the next byte to get the length and then read this number of bytes.  I recommend using a queue to send the data to another loop for treatment.

  

• While loop stops unexpectedly

  Hello world

  I have a problem with while loops.

  Im trying to write a program that allows me to control the temperature of a hot plate, using as a starting point one of the examples in LabVIEW (basic series writing and reading). So basically the program sends an order asking the real temperature of the heating plate and it then reads a response with the State, then the user writes a temperature (the sub - VI creates the command that is sent to the cooking plate), then he reads a confirmation response. the while loop is to monitor the temperature and change it if necessary

  Sometimes it works for about 30 seconds and sometimes for a few minutes, and then everything stops playback, I don't get the error messages, it stops just a response.

  The hot plate is a pro H550 MS7 and im using a USB to RS232 converter

  PD, I'm pretty new using labVIEW, sorry for my bad English.

  Greetings and thanks for the help

  Bob_Schor wrote:

  Found the manual.  Here is a summary (edition - in fact, it is essentially all of the manual, just condensed and without 'images'):

  • The statement format: prefix, Instruction, data frame, Checksum
  • Command: Prefix is 0xFE
  • Answer: The prefix is 0xFD
  • Add at least 50 msec between pairs of bytes
  • Data frame, send high and low bytes
  • Checksum = sum of the instructions, the frame data, but not prefix
  • Commands and responses seem to be mainly sequences of 6 bytes

  OK, this helps a lot.

  The first issue with the OP code: turn off the stop character.  The protocol uses binary communication protocols.  The stop character is only useful for communications ASCII protocols.  Nor if he was being a 0x0A in data, VISA Read stop reading right there because it's the stop character and it is enabled by default.

  Second, always do not have need of the bytes to the Port.  You know what you send and you know what should be the answer.  Therefore, suffice to say the VISA of reading to read the required number of bytes.  If your delay is long enough, you do also not waiting for him by saying the VISA must read the number of bytes to read.

• Why do I get error 1122 to dequeue element loop of consumer when I hit the stop button

  When I hit the stop button in the vi, stops of producer loop, the loop of consumer gets an error and stops without having read all the elements and then my status check queue loop will continue to run because he never goes to 0.

  Any help?

  matt198717 wrote:

  I think that's what you were talking about.  If you have any advice or pointers for this VI please let me know.

  1. your consumer loop should use the Dequeue elements.

  2. your consumer loop should actually be freeing up the queue in the case.

  3. it is also useless for the polling stations see how many items is stored in the queue.

  4. your wait in the loop of producer should be that when there is no data in the buffer (you have it in the case of bad).

  5. do not use the value of the bytes to the Port reading VISA tell how many bytes to read.  Say you reading VISA to read more bytes that you always expect the message to be.  Let the stop character stop playback.

  6. use a VISA reading just after the initialization of your port to synchronize your messages.

  

• VISA SERIES termination character producer consumer model

  Hello

  I'm developing a HMI to receive data from a sensor.
  Material sensor is built in my company and I have no flexibility with her. Only 2 RX & GND wires, no possibility of
  hardware handshake.

  The sensor send to an RS232 com port a string hex each 1 s, 10 s, 60 years or more and I can not know the frequency.
  So, I scan each data bytes to the serial port and serial port with VISA Read 20ms. At the end of the string hex sent by the sensor
  There is a stop character but I don't how to use it.

  I use the model producer/consumer do not lose any data.

  In fact, I read and concatain received data (with VISA READ) until I got the right number of bytes (because I know the size of)
  the sent hexastring is 495 bytes).
  But in the real work, I don't know the size of the data to be received by the sensor. (<500>

  So, I want to use the character of endpoint to stop the loop of producer that contain VISA READ.

  Should what special function or the property node I use to do this?

  I've attached a screenshot of JPEG of my code.

  PS: for the development of the VI, I simulate the sensor data with another PC that sent the hex string in loop
  with the stop character.

  CHRI = s = nour wrote:
  Hello

  But in the real work, I don't know the size of the data to be received by the sensor. (<500>

  A method to read an unknown number of bytes: put just the bytes to the Port in the whole loop (not read). Place the output of bytes to the Port into a shift register and compare the latest iteration with the current. When the number stops change (current loop = last loop) then all bytes have arrived. Bail out of the loop so directly while reading VISA.

• VISA READ stops the playback to the 'zero' - tank

  I read a message to binairy, from a RFID tag that looks like this:

  spell [01 09 0C 6th B9 53 0 to 00 00 00 00 8B]

  The bytes to Port-property shows me the full message (12 bytes) is present in the port.

  I do a Visa_read with the 12 bytes as input, playback always returns with 7 bytes read.

  If the Visa_read stops to ZERO characters...  In a subsequent read I take the other 5 bytes.

  Why the VISA_READ stops at zero?  (I use XON/XOFF and the stop character is defined as 15, not zero!)

  Check the code below

  Thanks for the help in advance!

  In fact, I bet she's reading the 0x0A and you put in place of the port with the following default properties:

  • The end of the reading mode = TermChar
  • Char end = 0x0A
  • Char term remove for readings = True

  If you check the cluster of error of the warning message will tell you that the tank of the term has been seen, there could be more data available...

  Enable the implementation of the port with a F wired to the character of the period.

  EDIT: Oh the jpg clearly shows that I was right make T a F

• How can I set more than one character of endpoint for interface RS-232 communication?

  Hello

  I have to communicate via the interface RS-232 of the PC with a card microprocessor. I use the "Advanced Serial write and Read.vi ' off examples of LabVIEW and it works on the principle.
  "My problem is the stop character: it looks like I can put a stop character, IS 0xA (so LF / line break) OR 0xD (CR / carriage return), but I have the need to react on the different characters of endpoint as"OK"gold""; I want to set a control (this VI will be used in a TestStand sequence).
  Is it possible to do, so that I can put characters from end of Cork I need? The property node in "VISA set up serial port" just accept an unsigned integer, nothing else. Of course I can get it running with the time-out-, but it is not very pleasant and extends the duration of trial unnecessarily.

  Thank you best regards &!

  It would be for writing. The poster wondered about reading. To read it, you will need to write your own routine of reading. Basically, you will need to use a loop and inside the loop, use the VISA to the Serial Port bytes to see if there are all the bytes available. Read the number of bytes and add to a string that you build in a shift register. After verification of concatenation to see if you have the characters of endpoint. If so, the reading is done. Pretty simple. Don't forget to disable the option enable the termination character in VISA configuration.

• When a character appeared reading serial port

  How to wait for some specific characters occurred in the serial port (e.g. port COM1 RS232 on PC) and then they recover at the port?

  I want to communicate back with a motor controller that uses ASCII strings such as commands and responses. It formulates a response to any command sent, and the response contains exactly a termination character (that I can specify during installation) at the end of the response string. Sometimes also, it sends a message when there is no order issued, for example a disc error message. There is no simple way and reliable when the controller is going to speak, when he won't, and the message will be exactly how many time, but we do know that each message will have this stop only at the end character. I would like to interpret the entire message in my code, that is to say, I would like to retrieve the string of all the characters from the previous endpoint character up to and including the most recent stop character. I think it means that I would have a VI that returns the message string and does not stream until the stop character appeared and was added to the response string. Or, Alternatively, a loop that adds entire messages to a queue of strings.

  All the screw example I found seems to rely on a certain number of milliseconds to wait or to know how many bytes to read, in order to use VISA Read.

  So far, I use a loop which seeks bytes in the buffer, retrieves everything to add to a string of shift register and test if there is a character of the string endpoint, all extract up to and including the stop character, if so. This feels very awkward and expensive for what should be a common task. Is this general law approach, or did I miss something in a simpler way?

  I read on the communication by Message and characters of endpoint, approach that sounds functionally similar to this, but it seems around standards of SCPI and my motor controller does not support this. In any case example Finder does not get a single hit on 'Message '.

  Thank you!!

  It really looks like you are doing things a lot more difficult it must be. Look at the VISA configure Serial Port. It has a character of endpoints allow and end characters entries. If you wire a real (or leave that he unwired) entry activate, read VISA will end automatically when you specify the stop character is detected. As long as the number of bytes to read is larger that the largest string that you expect to read, there is nothing else you need to do. That's how examples of shipment are put in place and discussions about the characters of the termination. Should there be nothing related to sustainable intensification of CROPS. If you do not get a message in your specified time-out, you get a time-out error.

• Adding characters to start and stop in a text field?

  "For 1 d bar codes, there are two options according to the type of form to use. The forms you create in Acrobat (acroforms) can be set up to use a bar code with a standard text field. If you want to include the standard start and stop character (*) or a control character, you can use JavaScript to add them. The control character should be calculated, but that can be easily done with JavaScript. »

  How I go this. My current PDF form will make a first and last name on the form in a bar code format, but I have to add in * NML for the beginning and the other * end of the data that has been drawn from a SQL database.  example the pdf has a field named "borrower1_last_name" and who filed pulls the family name...  So I thought there should be an easy script as you say add to the properties of the field.

  post here now, because no one seems to be able to point me to the correct resourse on the reader forum.

  I answered your question last week: http://forums.adobe.com/message/4040845#4040845

  Note that the same script can be used in the event Format instead of the Validate event if you do not add the start and stop characters of the value of the field, but just what is displayed.