Understanding The Status Leds - Thermo Scientific APEX 100 User Manual

Understanding the Status LEDs

An RTU card is equipped with four status LEDs, as shown below.
Here is what the LEDs on an RTU card are telling you.
LED # Status
1 Processing
2 Bus error
3 Bus ready
4 DIP switches
Page 348
What the lights are telling you
Flashing green = Processing.
Off = Not currently processing.
Off = Normal (or card not initialized).
Solid red = Bus error.
Solid green = Bus is ready.
Solid red = Bus time-out error.
Off = Card not initialized correctly.
Off = DIP switches are in use and the
settings are good.
Solid green = DIP-switch settings have been
modified by mailbox message.
Solid red = DIP switches set to non-active
status—that is, all are off or set
to illegal values.
Thermo Scientific APEX User's Guide