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Input to SYNCHRONOUS (9), AUTO‑ZERO (11)
and HOLD RESET (13)

RD-50E IO circuit

Input to EXT 1 (15), EXT 2 (16), EXT 3 (17) and
connector pins (RD-50E)

RD-50E IO circuit

Input to analogue input terminal INPUT X (5) and
INPUT Y (7)

RD-50E IO circuit

Analogue voltage output (3) - (4)

RD-50E IO circuit

NPN open-collector output
[HH OUT (18), HI OUT (19), GO OUT (20), LO OUT
(21), LL OUT (22), PEAK/BOTTOM (24)]

RD-50E IO circuit