Good Morning, This will be my first time trying to communicate with a HMI. I have a panelview 550 CAT 2711-B5A5 with a RS232 port. My question is what do I need as far as hardware like a cable to establish a communication using RSlink. I was told I should be able to communicate to this device with the followings that i have in my possession right now.... CAT1747-UIC. I tried and of corse it did not work for me. Please help. Thank you.