Status Leds; Ac Ack; Rs-485 Ack - Procon MelcoBEMS MINI Installation Manual

8. Status LEDs

There are two status LEDs on the MelcoBEMS MINI (A1M). The LED indications are as follows:
LED Name

AC ACK

RS-485 ACK

8.1. AC ACK
If this LED is permanently lit and does not flash, check the CN105/CN92 connection is secure.
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/RS-485 configuration.
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Colour
Lit when A1M is powered, flashing indicates valid communication
Green
with the indoor unit.
Lit when A1M is powered, flashing indicates valid Modbus
Green
communication.
Functionality