Does someone have an example VI for communicating through Modbus with an equipment with LabVIEW? It'll be great if you can share the code. I tried the NI Modbus library but it did not work out, so I'm not sure what I'm missing.
With RTU in particular I've found that there are a lot of devices that don't follow the spec with regard to parity, stop bits, etc. Since its RTU I'd verify the settings from your device's spec sheet and check them against the modbus setting.
Section 2.5.1 here http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
Bits per Byte: 1 start bit, 8 data bits, 1 bit for parity completion, 1 stop bit
Even parity is required, other modes ( odd parity, no parity ) may also be used. In