Write to register using EITHER Modbus

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• I use the MODBUS library and can receive data, but I can send it very well?

  Hello

  I use the Modbus Library to communicate with a VFD to control a fan. I use the master write and read vi. I can write data to the drive mechanism and get the fan to do what I want. The VFD is supposed to send a package of confirmation after I told him to do something and I can also read its records. When debugging the VI it shows that the problem is that the buffer always reads zero and the VI timesout. If I look at the USB adapter lights to RS 485, I use to interface with the drive mechanism, I see that the flashes of light RX immediately after I send a message. So I should have something in the buffer. Does anyone have any suggestions?

  Aaron

  OK, here's what has happened to those who have this problem. In the series Receive.vi MB The bytes to the Port of property node has been reading 0 even if there was something in the buffer. Executing the program was then stuck in a loop until it expired and never went to read anything of serial port buffer. I didn't spend too much time wondering why that VI has not worked and created my own. Within a period appropriate after writing to the serial port, I used the same bytes to the Port property node and was able to get the exact number of bytes to the stream and then VISA vi the number of bytes to read. I received the message of the right answer and everything seemed good. But of course that NO! Then I experimented with different speeds of writing to the drive mechanism to get the fan to operate at different speeds. I found a small range of speeds where I get no response to the VFD, either in operation or by sending me a response packet. After a while, I found that there is a mistake in the LRC-8 code in the MODBUS library OR. It does not prescribe that the LRC will be a two-character value. So if your LRC is proving to be a single character such as F value (which should be 0F) you get an incomplete MODBUS message. This has been easily corrected in the vi LRC8 saying "number in hexadecimal string" vi to produce output with a minimum width of two. Then everything worked fine. Moral of the story, it's the MODBUS library is awkward.

• Forced to use either with DragonDictate - my FF gives you 2 options: IE or IETAB. What is the difference and how does it work if I have not installed it IE?

  With the help of Dragon dictate the forums unless I use either half of voice features are lost (such as the ability to fix!).
  It is not a big deal to click one of the options, but I'm curious to know what compromise of performance can be AND security.
  (I don't trust ANY product of $ M).
  I'm still "inside" umbrella security FF?

  The IE TAB for Firefox extension is not an IE emulator but uses rather the IE itself in a Firefox tab.

• How can you write a resume using windows Vista Home Basic?

  How can I write a resume using windows Vista Home Basic? I put t have microsoft word or office.

  Start menu -All Programs - Accessories - Wordpad.

• How to write a file using BB 10 HTML5WebWorks

  Hello

  How to write a file using Blackberry 10 HTML5WebWorks API.

  https://developer.BlackBerry.com/HTML5/API/BlackBerry.IO.file.html#.SaveFile

  The example above does not work in BB 10.

  Please guide me.

  Of course, look at line 95 of this file:

  https://github.com/BlackBerry/BB10-WebWorks-samples/BLOB/master/invoke/invoker/invocations.js

• Including a carriage return when you write in a single register using Modbus

  I use a NI USB to RS - 232 to connect with a Watlow EZ-Zone PM controller using Modbus Protocol and will have bad to write a value (set temperature) to the controller.  I got when reading registry values, so I know that my settings are correct.  I also checked this using a program of Test of Modbus Watlow provides.  Using this program, it became clear to me that a carriage return is necessary after the numeric value.  MB series query writing Master only allows a value of U16.  How can I include a carriage return?

  A statement like that makes me think that she's not speaking modbus.

  Run their program during execution of something like Portmon.

  Then compare the data sent back with the modbus specification.

• Writing in a single register using Modbus

  Hello

  I use the library for LabVIEW 8.5 Modbus

  I am trying to control a motor control system using LabVIEW as the master device.

  I know the address register and all the other protocol identification, slave for my devices, but I have no entry on my block diagram for the actual value to write of these asides. How can I send a value to write?

  Thank you

  Yes, assuming that you have specified the correct address and the registry value, it should work.

• the spell checker button is dimmed and the fate that you write does not work either. I'll have to use microsoft word, then copy / paste.

  See the question

  Restart Thunderbird with disabled modules (Thunderbird Safe Mode). On the Help menu, click "restart with disabled modules. If Thunderbird works as usual, there is an add-on or theme interfere with normal operations. You will need to reactivate the modules one at a time until you locate the offender.

• Using NI MODBUS - reading of several distinct registers

  I'm using LabVIEW 8.6, with the NI MODBUS 1.2 VI library. I have a device which serves up to 50 records, all keeping the same format. I want to read about 20 of them, however they are not consecutive.  (40010, 40015, 40017, etc.)  Read Holding Registers VI gives me the opportunity to read consecutive registers beginning at a given address.   On the other hand, writing several registers VI seems to me to write in an array of distinct registers. Is it possible to do it for the reading of records?

  AZZOAutomation wrote:

  I'm using LabVIEW 8.6, with the NI MODBUS 1.2 VI library. I have a device which serves up to 50 records, all keeping the same format. I want to read about 20 of them, however they are not consecutive.  (40010, 40015, 40017, etc.)  Read Holding Registers VI gives me the opportunity to read consecutive registers beginning at a given address.   On the other hand, writing several registers VI seems to me to write in an array of distinct registers. Is it possible to do it for the reading of records?

• urgent request: how to read the value of a register using VISA read?

  Hello world

  This is a very urgent investigation. can someone help me please? Thank you very much!!

  I wrote a few commands in several registers using VISA write. now, I want to read the value of a different register.

  But the bytes returned are just the commands, I wrote before and a few other commands that I don't know what they are for.

  This is the format of the command, and I enclose the sheet... I want to read the value of register (0 * 41)

  .

  Ravens, if you have something more than me, do not so much it at all =)

  The command you have posted has several components:

  The gray area of the transport layer uses for a checksum

  several bits set to 0.

  a single bit to define if it's a read/write operation

  a byte to identify the register of interests.

  two bytes for the data.

  With what you have provided, there are only three things we need to worry:

  (1) set the R/W bit to 0 to mean we're reading rather than write.

  (2) set the second byte 0 x 41 to focus on the register of interests.

  (3) with a reading, I can't imagine the last issue of two bytes.  They probably ignored.  The documentation you provided does nothing to explain this.  The most logical thing I can think is that these two bits contain the data, you go to the registry if you set the R/W bit to 1.

  There are two parts to this communication.  The first part is an entry VISA to send this control unit.  It is likely that you will need to complete the message.  You will need to know how to do this.

  The device must respond with the message that you mentioned in the original post.  Crows is right.  He's coming back as a string.  You can use the subset of string to separate the components defined by the standard.  You can use these components to determine if the data is legitimate and then do what you want with the data.

• Cannot transfer or write emails. Using the linux operating system

  I can't write an email or send an e-mail sent. I use linux for operating system.

  Solved the problem. It was the program of Ghostery.
  Thank you for your help.

• Cannot write negative values on server modbus on cRIO 9068

  Hello everyone,

  I'm moving a project from a platform of 9114 cRIO a cRIO9068, the reason for a difference of heavy in terms of power CPU, memory, performance FPGA etc...

  Real time I deploy a modbus TCP server, and I publish just I16 data.

  The problem comes when the program tries to write a negative value to a binded on modbus variable. This variable is in the same format (I16), the program could write negative values, between 0 and -32768, but whenever the modbus force set to zero.

  I tested the modbus also with the 'system of distributed OR 2014 Manager' but always impossible to write negative values on I16, but I can if I consider the data as I32!

  (see files)

  Furthermore, I deployed a modbus server on my PC and in this case, everything is fine.

  More information:

  I work with labView 14.0f1.

  The cRIO are installed 'Labview RealTIme 14.0.0' and 'server Modbus I/O 14.0.0.

  I tested the feature on three different cRIO 9068 with the same result.

  I think it's something wrong with cRIO 9068, can anyone help me?

  Thank you

  MZ

  Hi, Marcello,.

  I was able to reproduce the problem cRIO 9068 and it look like a CAR (corrective action request). I've opened a request for Corrective Action (AUTO ID 511039) to report the issue OR R & D.

  Have you tried to implement MODBUS slave on ana MODBUS master PC on cRIO? I tried and it works even with I16 data types.

  I hope this will help you.

  Kind regards.

  Claudio Cupini

  OR ITALY

  Technical support

• is possible to use either usb 6353 map with Matlab 2010A

  Hello

  On a bought a NIUSB 6353 map, but in my computer don't I i the 2010 version of Matlab. Is there a way to control this version of this map with MATLAB

  Thanks in advance

  Hello

  And thanks for posting here.

  Please write in English if you post here. Otherwise, post on the french forum.

  NI USB-6353 using the DAQmx driver, it must be used with Matlab.

  You will find several links from the NI USB-6353 by clicking here.

  And presents an additional link showing you how to use your device with Matlab: Introduction to NOR-DAQmx with Matlab tools

  Kind regards

• Cannot write the coding using BBDevMGR.exe

  Hi ALL, I have to write a program to copy the files from the BlackBerry smartphone on desktop. I learned that BlackBerry Device Manager is used to communicate with BB. And we can write programs using BBDevMgr.exe, which is installed when BlackBerry Device Manager is installed. I was able to add a reference to BBDevMgrPs.dll, but could not able to create an object, or be able to view the public methods in it. BBDevMgrPs.dll is located in the same folder as BBDevMgr.exe. IAM writing the program in Excel VBA. I've seen the C++ code in Desktop_API_Reference_Guide_46.pdf, which uses BBDevMgr.exe. Help, please.

  I think that there you will not get the answer.

  Try asking your question on the communities of C++ developers who write applications for Windows.

  For example here: http://www.codeguru.com/forum/

• How to write queries nested using the DB adapter?

  I want to write a request nested by using the help DB adapter box...

  SELECT INVOICE_ID, FILE_NAME IN BILLING_INVOICE_PDF_V where FILE_ID =)

  (SELECT MAX (FILE_ID) FROM BILLING_INVOICE_PDF_V WHERE (INVOICE_ID = '12345'))) ;

  Thank you

  RAM.

  Hi Ram,

  It's probably the semicolon at the end of the SQL statement that causes the db adapter for error; Simply enter the SQL custom without a semicolon at the end.

  SELECT INVOICE_ID, FILE_NAME IN BILLING_INVOICE_PDF_V where FILE_ID = (SELECT MAX (FILE_ID) OF BILLING_INVOICE_PDF_V WHERE INVOICE_ID = '12345')