7.6 The LED functions
Number LED Function Description
1 Power Power and
communication
indication
Blinking = communication error with the MAS base unit
Lit = power is on and communication with the MAS base unit is
established
3 RD Receive data RS-485 or Modbus communication with MAS base unit
2 TD Transmit data
4 R1–R4 Relay status of four
individual channels
LEDs are lit or blinking when the related relay is active.
Blinking = alarm
Lit = OK or acknowledged
7 Technical Reference
MRM 01 Installation, Operation, and Maintenance Manual 15
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