Sorry for super newbie question. I am able to send request for individual read & device address using the stock Modbus RTU script however I am running issues with running the script code provided as an example by @Vladimir above.

I have saved it as a new script and when I hit send in Transmit pane, it still sends the request for one read & device address and doesn't run the script.

UPDATE: I have figured out that there is separate tab for sending script messages next to settings