I have a similar set-up:
F1616-BA
MD EXP 1616R
MD-HMI
I tried the sample code in the zip file for the HMI, but the keystrokes didn't register. I tried each sample program, then wrote code:
DM[3901] = INPUT[1]
DM[3902] = INPUT[2] ' Get data from input #17-32
DM[3903] = INPUT[3]
DM[3904] = INPUT[4]
DM[3905] = INPUT[5]
DM[3906] = INPUT[6]
DM[3907] = INPUT[7]
DM[3908] = INPUT[8]
And watched the "View" of the DM fields as I tried different keys during realtime monitoring. Nothing showed up using short and long keystrokes.
I checked the ribbon at both ends, and I know I'm getting power to the LCD at least because I see the "Z$=" displayed.
What else can I do to test how to recieve the HMI input?