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Meaning of the LEDs on the receiver
LED
Color
1
Red/green OFF
2
Red
Operating indicators on the MLC 520/530/SPG receiver
3
1
LED1, red/green
2
LED2, yellow
3
OSSD icon
4
RES icon
5
7‑segment display
10
State
Red
Red, flashing slowly
(approx. 1 Hz)
Red, flashing fast (ap-
prox. 10 Hz)
Green, flashing slowly
(approx. 1 Hz)
Green
OFF
ON
Description
Device switched off
OSSD off
External error
Internal error
OSSD on, weak signal
OSSD on
Transmission channel C1
OSSD off, transmission channel C2