How do I implement a Modbus TCP/IP device?
To implement a Modbus ® TCP/IP device, download the Modbus TCP/IP Protocol specification and the Modbus TCP/IP implementation guide from the website. You also need to understand the basics of implementing a TCP driver. To test your driver, you will need a minimum of two devices: a slave and a master to exchange information. This could be two PCs talking to each other using standard Ethernet cards, or a PC talking to a sensor or device with an embedded microcomputer.