ECM-3455J User’s Manual
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1.8.3 COM Port +12V/ +5V/ Ring-In Select: COMA_PW, COMB_PW
These jumpers provide selection b12V, +5V, and Ring-In (default).
1.8.4 GPIO High/ Low Select: GPIO_SET
This jumper provides selection for GPIO High (+3V, default) or Low.