By Antoine Chalons
I'm starting to use LabVIEW 2020 Sp1 on OpenSuse 15 and the event structure editor - I mean the dialog to add / edit handled event - seems to have localization issues.
Also, a difference from Windows LV, if a constant is connected to the timeout terminal, LV requires that you handle the timeout event... weird.
Is it normal / known to have these "issues"?
By Yaw Mensah
I have installed Labview 2020 on Dedian Buster using the rpm to deb conversion method via alien. Due to Architecture mismatch i deleted the *i386.rpm files before conversion.
My Problem is that after creating a project at "Build Specification"-> "rigth click" i am only able to select "Source Distribution". Application does not show up as an option.
I will be grateful for any suggestions.
Thank you in advance.
I'm connecting to a Rigol DZ1000 Oscilloscope via USB and using the :DISP:DATA? ON,0,PNG command to grab a screenshot. Reading out the data in blocks of 65535 bytes until there is no more (see attached vi).
This normally works fine but yesterday I was getting a timeout error. I fired up IO Trace and got this:
> 783. viRead (USB0::0x1AB1::0x04CE::DS1ZA201305475::INSTR (0x00000001), "#9000045852‰PNG.......", 65536 (0x10000), 45864 (0xB328)) > Process ID: 0x000039C8 Thread ID: 0x00001760 > Start Time: 13:13:54.1169 Call Duration 00:00:10.4323 > Status: 0xBFFF0015 (VI_ERROR_TMO) You can see that 45864 bytes were received, which is exactly what was specified by the binary data header (45852 data bytes + 11 header bytes + 1 termination char)
I dumped the reply string into a binary file and set the scope to run so it show something else on the screen. Sure enough the error went away. I also dumped a good result into a file. Then I tried to figure out what the problem may have been but I didn't get anywhere. Any ideas? Sure looks like a bug in VISA read or perhaps an incorrectly escaped reply from the scope?
It's very easy to "convert" the reply into the screenshot - just remove the leading 15 bytes (4 bytes from WriteBinayFile and 11 bytes from the scope header). And yes, both data files display just fine as PNG. I don't think PNG does internal checksum so byte errors would be hard to spot.
Any ideas what could have caused that timeout?
I am experiencing numerous VISA Lock Errors (-1073807345) on resources I haven't explicitly locked. This is happening on TCPIP connections to keysight N6700 power supplies and keysight N5242 PNA fairly regularly.
I have simultaneous loops in the application communicating to the different instruments, using a sequencer of sorts to pipe commands one at a time to each of my various loops.
Has anyone seen the locking error pop before while not actually using the Lock and Unlock VIs? This issue has gotten worse lately and it has come time to find the root cause. My only thoughts are that it may have something to do with having NI MAX and Keysight Connection Expert both installed and possibly trying to "ping" these devices. Every once in a while me sending commands and these "pings" may clash and cause the locking error.
Error reads as follows:
"Specified type of lock cannot be obtained, or specified operation cannot be performed, because the resource is locked. VISA error code -1073807345 (0xBFFF000F)"
We are using LabVIEW 2013
Thanks in advance!
View File Plasmionique Modbus Master
This package contains the Plasmionique Modbus Master library for LabVIEW.
It supports RTU, ASCII and TCP modes with the following function codes:
0x01 - Read Coils
0x02 - Read Discrete Inputs
0x03 - Read Holding Registers
0x04 - Read Input Registers
0x05 - Write Single Coil
0x06 - Write Single Register
0x07 - Read Exception Status
0x0F - Write Multiple Coils
0x10 - Write Multiple Registers
0x16 - Mask Write Register
0x17 - Read/Write Multiple Registers
0x2B/0x0E - Read Device Identification
Other features include:
- Sharing a COM port across multiple Modbus sessions using VISA locks (10 second timeout).
- Sharing a Modbus session across multiple communication loops.
- TCP transaction ID handling to ensure that requests and responses are matched up correctly in case responses are received out of order.
- Modbus Comm Tester, available through the "Tools->Plasmionique" menu, for testing communication with a slave device without writing any code.
- Detailed help document available through the "Help->Plasmionique" menu.
Examples are included in "<LabVIEW>\examples\Plasmionique\MB Master\":
MB_Master Comm Tester.vi: Demonstrates usage of API to open/close connection and communicate with a Modbus slave device. MB_Master Multiple Sessions.vi: Demonstrates usage of API to open concurrent Modbus sessions. MB_Master Simple Serial.vi: Demonstrates polling of a single input register over serial line. Download a copy of the user guide here: MB_Master - User Guide.pdf
Note that Version 1.3.4 of this library has been certified compatible with LabVIEW and has been released on the LabVIEW Tools Network: http://sine.ni.com/nips/cds/view/p/lang/en/nid/214230
The most recent version of this library will always be released on LAVA first before going through NI's certification process.
***This project is now available on GitHub: https://github.com/rfporter/Modbus-Master
Submitter Porter Submitted 04/01/2016 Category LabVIEW Tools Network Certified LabVIEW Version 2012 License Type BSD (Most common)