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I figure you might ask for the pinout from mesa flash so here is that.

I added 12v field power to the 7i77 but still am getting the pin doesn't exist error. I do have a new light on the 7i77 though.

The 7i77 must have field power or the field I/O pins will not be present:

hm2/hm2_5i25.0: IO Pin 003 (P3-15): Smart Serial Interface #0, pin tx1 (Output)  << 7I77 analog out is working as it needs only 5V
hm2/hm2_5i25.0: IO Pin 004 (P3-03): Smart Serial Interface #0, pin rx1 (Input)
hm2/hm2_5i25.0: IO Pin 005 (P3-16): IOPort  << This is the 7I77 digital field I/O. It's not working, likely because 7I77 field power is not present
hm2/hm2_5i25.0: IO Pin 006 (P3-04): IOPort