Modbus libraries for LabView 8.0

[Christian_nor]

There are modbus libraries available for download, supporting LV 7.1. When will these libraries be updated to 8.0?? I kind of need them for my application

[unclebump]

You should be able to open the 7.1 format files in 8.0 without any issues.

[Christian_nor]

Nope,

The downloadable file is called nimodbus.msi. When I open it, it starts the installer, but suddenly stops and tell me that the innstallation requires LV 7.1 innstalled.

-Christian 

[unclebump]

Try this file. These were saved back to 7.0 format.

[Christian_nor]

Has anyone tried to save them up to 8.0? I saw a comment on the downloadpage for ver. 7.1 that one "anonymous" complained about broken wires. I am not very experienced in LV and if some of these sub VI's result in broken wires, I would probably get into some difficulties.. Please let me know if anyone has actually tried it in LV 8.0.

-Christian 

[Christian_nor]

I tried these files. First the example with master and slave communicating between two com ports -> no response on any of them.

Something I'm missing? I did not get any error reports either. I also tried monitoring the input on the slaves com port with hyperterminal( messages from master), all I got from that was alot of strange "letters" coming in blocks of five. And it did not seem to respond on changes I made in the master .vi.

Has anyone tried this example?

[unclebump]

Here is an example that I use for modbus serial communication. I also have a TCP version if you need it.

[Christian_nor]

Thanx alot for trying to help. I triedf you're library, but I am still not getting it. I should probably read some more about the Modbus protocol. But my observations are: Whatever changes I made to the frontpanel of the .vi nothing happened. I monitored the output with hyperterminal and all I got was blocks of five "strange" letters. (almost like in the previous example, but they were coming at greater speed.) They were staying the same no matter what.

-Christian

[malef]

Some critcal remarks about the modbus library:
- library can only be installed under LV 7.1
- VIs use stacked sequences instead of dataflow programming
- error trapping is not passing from bootom to top
- simulating a slave is faulty
- function code 11 = "get common event counters" is not implemented
- function code 23 = "read/write multiple registers" is not implemented
- no documentation

Manfred

[Christian_nor]

Okei, so what does that mean? I'm not able to use these files in 8.0? Or can I do some small modifications and make them work?