Australia Posted 21 Oct 2011 I do not know should you had any success with this Greg, but I've an extremely similiar issue. My setup is: M340 connected to Connexium Ethernet Swap connected to EGX100 Gateway connected by means of modbus serial Sepam Defense relay. I've published the ST in https://kew-property-management63840.blogzet.com/modicon-m580-no-further-a-mystery-33201555