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RS485 line turnaround

Found an interesting item on my Axis-83. It is missing
D15 (D-5 on page 6 of schematic). Is this normal. Without
it, can't turn line around for RS485. It should either
have that or R72, which is noted Not_m (Not mounted??).
I jumpered pins 10 & 11, and it now works.


Frank Brown
Phoenix Consulting
for Emerson Climate Technology