troubles with rs 485 on Labview.

[betows]

Hi guys, so I trying to read some data of a meter ( Mult-K kron ), from the rs 485. I haven used the software of kron, and its works. But now I want read the same data on LabView and I cant read nothing. Sorry, I new on this. If somebody can help. 

Best regards ! 

[K C]

Hi,

If the SW of Kron works OK you know that the hardware link.

Tell us what you used in LabVIEW. What is the protocol of the meter ?

Kees

[betows]

Hi, tks by the answer. The protocol is modbus RTU (rs-485). 

I trying use this: 

And I used a converter rs485 to USB.

[K C]

You don't write anything. If you want data from a ModBus slave you first have to write data.

Why don't you use the ModBus Library from NI ?

[betows]

Hi, sorry about that. So I change to MB lib.

e use this : 

About write, how I know what I need write to receive the correct data ? I trying to search this in the manual, but I dont find nothing. Sorry, is the first time I'm doing this.

[lferreira · Accepted solution]

Hi,

Try to use the examples available in Modbus Library, and read a tutorial about Modbus in LabVIEW.

ModBus Protocol Reference Guide

https://www.ni.com/en/shop/labview/introduction-to-modbus-using-labview.html

Modbus Library

https://forums.ni.com/t5/Reference-Design-Content/LabVIEW-Modbus-API/ta-p/3524019

I hope it can help you.