User Manual

Page 46 Part # 68C-MKU, Edition 01/2007, Version 1.0
Table 3. MCU External Status LEDs
LED
Description
1. Power On Illuminates orange when the MCU receiver has voltage
2. Scan Mode
Not used when
system is
configured for fixed
frequency
Flashes red/orange in Scan Mode
3. RF Reception
Illuminates green when valid data from the OCU is received and
both OPR relays are energized
Illuminates orange if valid data from the OCU is received and the
OPR relays are de-energized
Illuminates red if data from another OCU (with invalid address) is
received
4. Command
Illuminates green when commands are received from the OCU
(normal condition)
5. Fault indication
Blinks red when the MCU detects a fault (refer to Table 4 below
for the blink sequence and the corresponding fault messages).
Referring to Figure 21 below, an additional PROCESSOR FAULT LED indicator is mounted on
the MCU processor board and may be viewed by removing the MCU front cover.
Figure 21. MCU Status and Fault LEDs