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40-400-00022 Rev. B
Chapter 8 - Front Panel Indicators and Controls
Power/ Status LED
A green POWER LED is located on the left portion of the front panel, to the
right of the Local Maintenance programming port.
LED Modes:
Power on/processor in reset
On steady - This is an error condition
Idle
Approx. 2Hz blink between Full/Half bright-
ness
In Use
Approx. 2Hz blink between Full/Off
Alarm LED
A red ALARM LED is located on the front panel, to the immediate right of the
POWER LED. The LED will be on solid red during an alarm condition and
during initial power-up.
An alarm condition can occur when any of the following occur:
•
Power failure
•
Power fuse failure
•
Watchdog failure
•
Checksum failure
•
Port time-out (a hung device on the User or Modem port)
•
Three invalid password attempts from the Modem port
The alarm condition will automatically clear when the cause of the failure
goes away.
Modem Port Transmit and Receive LEDs
A pair of green LEDs are located on the front panel, immediately to the right
of the ALARM LED to show data activity. They are marked TRANSMIT and
RECEIVE. When the DS-100 is transmitting data to the host/polling location
the TRANSMIT LED will be illuminated. When the DS-100 is receiving data
from the host/polling location, the RECEIVE LED will be illuminated. Both of
these LEDs will be off when the lines are in their Mark state, and on in their
Space state.
User Port Indicator LEDs
There are 4 User Port LEDs on the DS-104 and 8 User Port LEDs on the
DS-108. These green LEDs appear on the front panel, immediately to the
right of the TRANSMIT and RECEIVE LEDs.
LED Modes:
Port idle
Off
User Port Call Pending
Flash (once per second)
Port in use
On steady
Port Time-out Alarm
Approx. 2 Hz on/off