JLG X20JP - X600AJ Service Manual - Manual (Page 237)

SECTION 6 - JLG CONTROL SYSTEM
3121623 – JLG Lift – 6-21
MODEM LED CODE:
DL1 green LED permanently ON: power ON
DL2 red LED flashing each 1 seconds: Net signal
searching
DL2 red LED flashing each 3 seconds: Line ready
MODEM MODULE
DL1- Green ON Power +5V to CPU
DL2-Red (see table below)