MODBUS and TCP/IP

[shjukheter]

Hello,

               I am using labview2011. I interested to work with labVIEW very much. Mostly, I worked with SERIAL communications but this time I am going to work with MODBUS and TCP/IP protocols. I have never used then in labview. I understand quite well about TCP/IP in labview by seeing some examples. I have never heard about MODBUS and I don't have that functions in my current labview. Please help me that what it means and where can I get MODBUS vi's.

[AdnanZ]

This is what you need:

NI Modbus Library for LabVIEW

You are on the right track; try to look at the examples and you should be OK. Any questions, and post it on the forums where we can help you. Good luck!

[shjukheter]

I don't know any thing about MODBUS and how it's gonna help in TCP/IP. Please give me some short description.

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@adnan Z wrote:

This is what you need:

NI Modbus Library for LabVIEW

You are on the right track; try to look at the examples and you should be OK. Any questions, and post it on the forums where we can help you. Good luck!

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[Dennis_Knutson]

Did you actually look at that link? Or did you not see the 'Introduction to Modbus' that is there?

[shjukheter]

I have been reading the documents about MODBUS and understand well at the moment. Also, I have downloaded the modbus library from NI site but it is having all examples in it. How can I get especially NI-Modbus Vi's into my functions pallet of labview2011. More, Is there any existing programs on this  forum about MODBUS RTU or TCP/IP protocol so that I can start seeing more precisely.

[shjukheter]

I started my project that involves initially in communicating keller pressure sensor from NI CRIO-9073, which is remotely connected to my PC. I just want to dump a program into NI CRIO-9073 in such a way it can just get the pressure information from sensor.

 I am really new to measurement and automation and I have some doubts here..

1) In RS-485 communication, they are just using LAN cable connected to NI CRIO-9073 and other end it is connected to pressure sensor. I am really not understand here that I thought RS-485 is similar to RS 232 but it was really different to RS 232. Is that right? If so, here is rs 485 cable example http://arabic.alibaba.com/product-gs/51033724/usb-rs485-converter.html

2) I don't have modbus vi's in my labview 2011 and I downloaded the NImodbus zip library from NI, but, i am not sure how to get these VI's into my labview.

3) Let say if write some code in labview by using modbus vi's. I need to select a comport in this case if I want to run my program but as long as my PC is connected to NI CRIO-9073 remotely by LAN cable.

I have really some silly doubts but I want clear my self to continue in this project.