What is ACE969? An RS485 multi-protocol communication interface commonly used with Schneider Electric Sepam protection relays.
What usually causes communication problems? Incorrect wiring (A/B swapped), missing/incorrect termination, address conflicts, or mismatched serial parameters.
Where to start when troubleshooting? Verify wiring and DIP switches first, then confirm protocol and serial settings, then test with a known-good master device.
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Michelle Conney
FOUNDER / SENIOR ARCHITECT
