Delta HMI communication with arduino atleaset led on off

Hai Sir,

i have Delta HMI DOPB07s415 .I want to send anydata from arduino uno to HMI through RS-232 using UART communication..for that HMI ,DOPSoft software downloaded.we can desigh basic GUI screens.BUT i dont know how to communicate HMI GUI screen with our harware(arduino uno) using RS-232...

Plese help me :frowning: :frowning: :frowning: :frowning: