please see the message from modbus simulator in the attached photo. This application should be read in conjunction with. Got any anti virus software running? Try turning it off, same for the firewall. an OPC Server, (KEPServer Enterprise) communicating Modbus TCP with an Elpro. Kepware 2: Check the channel properties Ethernet is like this (but this should not matter except the port number.Ĭan you check you computer for open ports, 502 needs to be open, but it should not matter if its all in one PC. Kepware 1: Check the channel properties Network Interface is default Responding: the comms screen looks like this when its talking, the responding ID has a yellow outline (circle) In a standard Modbus network, there is 1 master and up to 31 slaves. The master-slave principle is a model for a communication protocol in which one device (the master) controls one or more other devices (the slaves). Listening: Listening for connection (bottom circle) should be the last entry if its not actually communicating, you can toggle the connection (button in the circle), the button is not very intuitive, as its connected when the icon shows unplugged, The Modbus protocol exchanges information using a request-reply mechanism between a master (client) and a slave (server). You can toggle between Registers and comms using the button in the bottom circle. Setup: look at the top circle, this opens the Settings, check Server connections, I like 10, check the port 502 and check station ID as 1. Take a look at the attached screen shots in the zip file, if you are set-up like this then there is something else going on.
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