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8. Status LEDs
There are two status LEDs on the MelcoBEMS MINI (A1M). The LED indications are as follows:
LED Name Colour Functionality
AC ACK Green
Lit when A1M is powered, flashing indicates valid communication
with the indoor unit.
RS-485 ACK Green
Lit when A1M is powered, flashing indicates valid Modbus or
BACnet communication.
8.1. AC ACK
If this LED is permanently lit and does not flash, check the CN105/CN92 connection is secure and the unit type is
supported (see appendix).
8.2. RS-485 ACK
If this LED is permanently lit and does not flash it could be due to a physical RS-485 connection problem, or incorrect
Modbus/BACnet/RS-485 configuration.
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