SCOM-100, User guide 71
9.5.1 Main unit
LED Indication
POWER Presence of power supply voltage
NETWORK Blinking upon successful registration the GSM
provider’s network
S/R SMS Turns on during SMS receive or transmit
ERROR • Turns on after start up:
SIM card error
Modem error
Missing I/O expansion module
Excessive EM noise or hardware error
• Turns on during operation
Modem error
Excessive EM noise or hardware error
STATUS ON: RUN (Control) state
Blink: MONITOR state
OFF: STOP state
READY Blinking slowly: The unit starts up after power up
(approx. 1 minute)
Blinking fast: The unit starts after holding the start
up button pressed during power up: Initialization
process (approx. 1 minute)
On: Unit start up completed OK
Off with ERROR LED off: No user administrator
found in SIM
Off with ERROR LED on: See ERROR LED