Unplug the connectors from Access1 and Access3. Pin 18 to pin 19 on Access1 (not the wire) should be 120 ohm. And on Access3, pin 17 to pin 19 should be 120 ohm. If either is lower than 115 ohm or greater than 125 ohm......replace that Access module. Sometimes I forget, even though a part is new...doesn't mean it's good.
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