We purchased some equipment that has a DL06 PLC in it. I need to communicate with it using RTU MODBUS. I am completely new to MODBUS communication. I can connect to my equipment but any command I send it either results in a timeout error or executes error-free but does not actually do anything at the PLC level. In the code below I am simply trying to turn on 2 switches out of a bank of 4. I assume I need the master to write the command and the slave to read it. I get a timeout error when I run the VI. Thanks for any help anyone can offer.