I would prefer using Serial but there is TCP option as well. It looks like the equipment I am using have the option to select between RTU and ASCII, but the default is RTU. I ran the example VI in the library and I am getting 'Timed out' errors. I'm new to this so not really sure where to start troubleshooting. Driver Wtp 150 Windows 7. If there's an existing code that someone has that works on their end, then it will be helpful for me to troubleshoot it. I have attached a list of register defintion here.

Create MBAP Header of “MB Ethernet Master Query.vi” and link the controller to “MB Ethernet Master Query.vi” in frame0 ~ frame 3. Set IP and NetID of remote Modbus slave. Make sure the PC have VISA runtime installed. Open MB Serial Example Master.vi from. Some of its features include Works with standard serial and Ethernet ports Facilitates Modbus TCP/IP and serial. Skip to main. UE9 LabVIEW Native TCP Example. Tutorial outlines the high level functionality of the MODBUS application layer with emphasis on the specifications for a serial implementation and TCP/IP. LabVIEW Libraries. You can download free. A great point to start for your application is to look at the examples supplied with the libraries. There are examples for master.

Is the Modbus Protocol Supported on LabVIEW or the LabVIEW. Check out this Community Example. Possible to program LabVIEW to talk to a Modbus device via serial.

I know the serial settings. I do not know how to pass info to the unit and receive feedback. I'm not sure how to format the command or how to incorporate it with the modbus library vi.

I ran the example VI in the library and I am getting 'Timed out' errors. I'm new to this so not really sure where to start troubleshooting. If there's an existing code that someone has that works on their end, then it will be helpful for me to troubleshoot it.

I've used to example/library from the NI website with success. The code does work. Timeout out with serial would tend to indicate to me that there was no response. You should get error messages if you are talking to the device. My first suggestions would be physical.

Are you plugged in on both ends? Are you plugged into where you think you are?

Do you have a null-modem cable when you need a strait-through or visa-versa? Is the device on? Next thing to find out is if the unit your trying to communicate to is a master or slave.