Carrier XCT7 Installations- Und Bedienungsanleitung Seite 5

Part info for central controller
Power (12V, GND): 12V DC, follow +- signs for correct connections.
Fire alarm linkage contact (ALARM1, ALARM2): AC works normally when closed and all ACs are turned off with an open circuit.
Third party interface (81, A1): A1 should be connected to 485+ while 81 to 485-. Communication port (82, A2): It is used for
connecting converter,
follow +- signs for correct connections. A2 should be connected to 485+ while 82 to 485-.
Fire alarm linkage contact
Power: 12V DC,
there is +- for power
Communication port for
connecting converter
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