USB to RS - 232

Similar Questions

• Read power meter in LabVIEW via RS-232/RS-485

  Hello!

  I have a power meter, an advanced WM14 DIN power Analyzer. I want to display different values, Kwh, WILL, etc. Kvar, the meter in the graphs in labview. I have just a basic knowledge of Modbus RTU and with RS-232 connection. But I don't know how to make it work with labview. To my counter, I plugged a converter Moxa TCC-100 (see attachments) RS - 485 to RS-232, given that my electricity meter works only with RS-485.

  The converter, I have an adapter usb to RS - 232 (see attachment) to COM3 on my PC.

  Perhaps the easiest way would have been the connection directly http://sine.ni.com/nips/cds/view/p/lang/sv/nid/12845 . But I have not bought!

  So now you know the configuration of the connection, drivers for the usb adapter is installed and also VISA drivers. I found no good examples explaining how you can do with programs and data sending and reciving.

  I have google around and discovered that you use read/write VISA blocks, and that there is a library, Modbus, you could use. I installed the library, but I don't know how to connect with my electricity meter.

  I have a communication protocol to my electricity meter, but I don't know how to use it.

  I'm a little stuck and don't really know where to start. But my understanding of modbus, such things should be easy to do, so I think that's not too difficult to learn.

  Is there anyone who could explain how these work thing or if there is something I could read or see?

  Best regards Maurlind

  
  

• Send the signal current/voltage/USB DB25 to regulation of pump to

  Hi all!

  I want to control the speed of a pump with LabVIEW (Thermo Fischer FH100M, Manual) and so I have to send a current or a voltage signal to the pump. The pump has only one DB25 port. As my laptop is not a port DB25, I tried to control it with a USB converter.

  I had only a converter USB to DB9, so I started with (laptop) USB-DB9-DB25 (pump) > >.

  When I connect the pump on the USB port, it is instantly put in market, but in a strange way.

  Is it possible to use this configuration? Or is it possible to use at least USB-> DB25 (I have the Setup, see manual page 45/3-19)? Then, I would order that the cable companies.

  Or do you have other suggestions?

  Thank you very much in advance!

  Tobi

  Tobi,

  Stop it! Do not connect your converter to this device.

  When you say "Converter USB to DB9" are you referring to a USB converter to RS - 232? DB9 is just a connector and therefore DB25. TOU can wire anything to this connector.  Your converter is probably wired as a serial RS-232 port.

  The manual shows clearly on page 3-19 and the following pages that the control of the pump is NOT wired for RS - 232!  By looking at the speicifications for the inputs and outputs you shown on page 3-20 and 21 may damage the USB to RS-232 conveter or the controller of the pump by connecting them.

  To control this device you will need to a DAQ with analog input, analog output, material inputs digital, digital, outputs a counter. You will also need some external circuits such as transistors or relay static solod DC in proportion.

  Lynn

• Facilitate communication instrument via VISA/dll library

  Hi, I just receive a new piece of equipment that I would like to order via Labview and I am having trouble to communicate began with the device - a spectrometer in Acton (previous on the topic post). The device can connect via a usb or RS-232 cable and appears in as COM 5 and correctly Device Manager the label as the spectrometer of acton.

  I have the instrument dll file and the header file and a detailed description of all the functions but I'm scared, I am at a loss to know how to start. I already wrote labview programs to communicate via the read/write functions VISA but this instrument communicated through hexagonal orders and seemed easier for me to work with this new instrument where it looks like I need to send commands to chain - I'm getting lost in the syntax and correct structuring of the functions. The node to call a library function lists the functions of the dll, but I'm not clear on how to take of the generic Sub funcname (void); and match it to their arguments and the functions described.

  I'm also not sure what options I have to communicate with the instrument, is using the dll with node to call a library function at a level equivalent to sending a command string via the entry VISA, or are what they used in combination or can the nodes to call a library function be used alone for release with the instrument? I understand that these questions are very basic/generic I have just had trouble finding resources to learn the answers to these questions as links to be NEITHER documentation/examples or other messages from the forum would be greatly appreciated.

  I am including as an example some info on the first basic command I would start as per - a simple device search command:

  ----------------------------------------------------------------------------------

  "detailed description":

  ARC_Search_For_Mono, function used to search for attached Monochromators. With the
  exception of ARC_Ver, must be the first function call.
  Delphi: function ARC_Search_For_Mono (on Num_Found: integer): wordbool;
  STDCALL;
  VB: Private Declare Function ARC_Search_For_Mono Lib "ARC_SpectraPro.dll".
  (Num_Found As Long) As Integer
  Num_Found: The number of research Instruments Acton found and listed.
  Enumeration list begins with zero and ends with Num_Found minus one.
  Result: True, if all of the instruments where found.

  ----------------------------------------------------------------------------------

  a code in the dll header file:

  typedef unsigned _int16 (CALLBACK * LPFNDLL_Search_For_Mono) (long &);)

  ----------------------------------------------------------------------------------

  Any help would be appreciated, I think I just need a little help to get started. Thanks in advance!

  Because you neglected post in the the model number of this intrument, everything would be conjecture at this point.

• Vi resetting

  I see other threads dealing with discount zero problems of VI, but none which seem to have the answer that sorts my specific problem.

  I have a program that began with the example of series database read/write. Then, I modified the example so that a read function, as serial connected the device uses asynchronous channel, instead of asking and obtaining orders. Then the program sort and match components of the string to display data to the user appropriately. This program is simple and works well on one of the computers in my staff using the window 7 Enterprise (dell latitude), but the same program to run on the second PC (Lenova ThinkPad) staffs with the window 7 Enterprise seems hang or lock up. The same program on each but the Thinkpad displaying a box of vi rearmament always freezes and is causing the PC to lock up and they need to use the Task Manager to force its closure. The only difference I can see is the serial port converter (pig tail). A PC uses one type to another, a second type.

  Conversely, I have removed the function stop (abort) on the application and programmed the Vi at the end of a cycle before closing the program, but even this has not fixed the problem. Any suggestions or advice would be appreciated.

  

  Have you tried to switch the USB adapters series?  I had HORRIBLE luck with USB to RS-232 cards.  I didn't trust them as far as I can throw him.  But if you find a game that works consistantly, stick with those.

  The other possibility related to the USB port would be the 'power save feature' than Windows 7 where it will turn off power to a USB hub.  You can disable through Device Manager.

• Error reading misaligned GPIB

  Under Instrumeent i / o-> GPIB, are read are writing functions.  The error inside and out for these functions are not aligned.  Why is this?

  Should I still use the GPIB functions?  Can I use the VISA fucnctions instead?  I like the features of GPIB, because I only need to enter a number of GPIB address to a string for the address, and I think that it is convenient.

  Using GPIB functions has not recommended for quite a few years and certified instrument drivers need VISA. Using GPIB is, in my opinion, being short-sighted. They rope you up materials and you belay GPIB. With VISA, you can use other providers GPIB controller and you can easily use VISA with USB, Ethernet, RS-232, etc. with little or no code changes. The extent of comfort and control of resources VISA, you just select the correct resource from the drop - no need to try to remember addresses and you have support for aliases (i.e. "DMM"). I also have the VISA Resource Name Out makes for a neater wiring.

• 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.

• LabVIEW / mass spectrometer Setup

  Good afternoon

  I started programming in LabVIEW only a few weeks, so I apologize if I use terminology or describe something wrong.  I recently started a post-doc, and my first project integrates a mass spectrometer of SRS with an instrument of catalyst desportion, we bought.  It is very convenient that the LabVIEW modules are provided for the specification of the mass in question (http://www.thinksrs.com/downloads/labVIEW.htm). As such, the programming is much easier.  However, I have trouble finding how to initialize the unit of mass spec.

  Basically, I would like to have a USB-6000 receive a current of the instrument (the current goal is to score when the mass spec should illuminate the filament) this entry, initialize and run the specification mass.  To do this, I would be better to use SignalExpress with specifications of screws, or LabVIEW SignalExpress entry mass (IVI DMM acquire)?  Or I'm completely off base and you will need to use the DAQmx software?

  Thank you.

  Thank you for the additional information.

  1. the mass spec apparently communicates via a serial port RS-232 or ethernet.

  2. the other instrument communicates via ethernet.

  3. what you describe as "an RS232 cable internal" is most likely a cable with a DB-9 or DB-25 connectors, but certainly isn't carrying a RS-232 signal.

  To connect with the massive specifications will require a serial port adapter (USB to RS - 232) If your computer does not have a native serial port (like most do not thees days). Those with FTDI chips have a much better reputation for communication of the instrument than others.

  Before you connect the cable verification manuals to see if you can trigger the spec of mass via the communication port. If you can, it is perhaps much easier than setting up a program of analog outputs and splice in the cable.  The time is probably about the same.

  I don't know any about Signal Express, but do it in LabVIEW shouldn't be too dififcult. LV pilots for the specification of mass are old, but were written by David Moore, who has a very good reputation.

  Lynn

• Serial port communication

  Hello world

  I have a very disputed project.  What I have to do is to transfer a text file from a computer to my laptop with some constraints:

  1. The OS of the computer is just Windows XP Professional (not .NET, no programming language)
  2. It is not allowed to install software or this (working only on this computer) computer programming languages
  3. Some USB and RS-232 ports are available.
  4. No external storage device can be used (e.g. USB stick).

  So, I wonder if there is a way to do it.  For example, we succeed in VBScript or JScript that are available in WIndows XP?  We can transfer the file text on serial port or something (I don't know).

  I'd appreciate if someone could give me some suggestions.

  You can get help with the scripts here: http://social.technet.microsoft.com/Forums/en-US/ITCG/threads

• USB-232/4 causes Windows hang when wake from sleep

  I have a problem of resumption of the functioning of the laptop that follows "sleep" or "hibernate".

  With the connected USB-232/4, the computer does not return the Windows normally.  The display does not return (without backlight or external video output), but the LED indicators (bluetooth, disc, power, etc.) appear normal.  When I remove the USB from the USB-232/4, the display reverts immediately to the State before the mode 'sleep' activated.  Tried all 3 USB ports - all the same behavior.  No index by using the event viewer.

  Win 7 (64 bit)

  Series NI 3.7, NEITHER VISA NOR spy 2.7.2 5.0.2 MAX 4.8

  Serial port assignments seem to be OK:

  Port 1 - com15

  2 port - com9

  Port 3 - com16

  Port 4 - com8

  Any suggestions on the next steps to solve this problem?

  Thanks in advance.

  Solved the problem!

  The BIOS has a setting in the section advanced to Wake Up capability.  Compatible USB S3 Wake.  Now, the USB-232/4 is powered over the recovery of the standby mode.  When this feature is disabled, the USB-232/4 light not upon resuming from sleep mode and probably hung up the pilot, preventing a normal recovery.

• drivers usb-232 for 7

  Hello

  I use a converter OR USB-232 on 64-bit Windows 7 Prof. Windows 7 says that device works well but MAX does not identify it. In MAX, I see "manufacturer Unknow Unknow model".

  I already installed the NI VISA full 5.0.1 pack and use the driver VISA Wizard.

  What can I do?

  Thank you

  François

  Hello

  I have already installed it. I have please contact Support, and they found that my problem comes from seven. I got a way to uninstall the old drivers on Windows 7 and now it's OK.

  Thank you

• What advantage is there in using the NI USB-232/4 on a standard USB Serial Hub?

  What advantage is there to use the NI USB-232/4 on a shift to USE of concentrator series?

  

  I have an application that requires LabVIEW control of 19 instruments that communicate via RS - 232.

  I have read the Datasheet for the NI USB-232/4, and I see no benefit of spending $528 for this unit (five times) on a standard USB to Serial hub for half the price.

  Can someone tell me if there is an advantage for the NI USB-232/4 or if they have had experince with one?

  Thanks in advance.

  Agile wrote:

  Thank you, NYC for the quick response.

  Why you prefer that your desktop with taken PCI card in charge of ports series? The space? COM stable #s?

  COM stable #s, harder to disconnect randomly, don't have to worry about the bus power, do not have to worry about Windows randomly powering buses as a feature, reliability, often less expensive energy saving...

• USB-232/2 shows the COM ports but not found resources VISA!

  Hello

  I use an NI USB-232/2 interface to connect my OMEGA Engineering temperature controller to computer. The thermostat communicates with the computer via hypertermianl and the configuration of the OMEGA software, but can not be detected by OR MAX I've attached a screenshot of my MAX of NOR. I could see the two COM ports, but I can't see the VISA test Panel.

  My problem is similar to the post problem OR USB-232! I tried the solution for uninstall and reinstall NI VISA both NI Serial, but still does not.

  OR Labview 2009

  OR MAX 5.6.0

  NEITHER version 4.0 Serial

  Version NOR VISA 5.4.1

  Temperature controller: Omega Engineering CNi1644-c24

  Spoke engineering application NOR two days, no solution. Can anyone help? Thank you!!!

  

  
  

• Using NI USB-232/4

  Hi, I have an application where I need to control communication between two devices that use serial ports.

  Anyone know if I can do this with the NI USB-232/4? Can I use 1 of the serial ports to monitor what is happening between the other two?

  Thanks in advance.

  This device offers 4 independent serial ports.  Each will have its own COM port to access since.  So you can use it to communicate with up to 4 devices.

  With regard to the follow-up between two other devices, you will need a special cable to access the RX on either side of the communication signal and their son up to 2 ports series different on your computer, as with the USB-232/4.

• Problem with USB-232

  OK - this is probably a simple question, but it is at the origin of the questions that I do not know how to solve.  I am running LV 2013 on a 64-bit Windows 8 machine and I can't get the computer to identify a device USB-232 of NOR.  I'm under 4.0 Serial, VISA 5.4.  When I connect the USB-232 cable, a new entry in MAX peripheral slot and Interfaces called 'NOR USB' peripheral initialization.  I have no idea what it is or if there is something that I'm supposed to do with it.  Anyone have any ideas.  Everything would be welcome.

  Thanks, Matt

  As I said, I would recommend a reinstall of the NOR-Serial. I think this is the real driver that makes appears as a com port in windows.