Yaesu: I Am Trying To Use a Radio ECU Catdisplay with a Yaesu FT-818A -

[kc8pvb]

I am trying to use a "Radio ECU Display" I just purchased for my FT-818 radio. I do have the baud rate set to 9600 as per the manual However the only this the display shows seems the be the default screen. No Freq or anything else changes as I use the radio.. Is there any additional radio setings that need to be done for the external display to function? Any help will be great Thank You! Bob / KC8PVB