May 2001
System Hardware Manual 5 - 107
A6-324000-642-01 – Release 4.0
May 2001
3.1.4 Connectors
Before programming System Data, the battery must be
connected to CN4 to allow memory retention if a power
failure or brownout occurs. If a brownout or power failure
does occur, and the battery backup circuit is not activated,
System Data resets to the default values, all stations in the
system reset to the default values, and any data
programmed on individual stations is cleared.
When a CPUB( )-U13 ETU is installed in the system, the
clock/calendar must be set. This also applies when battery
backup fails for any reason.
If the CPUB( )-U13 ETU is removed for long term storage,
disconnect the battery from CN4. This prevents the battery
from discharging completely. The fully charged battery
retains memory for approximately 21 days.
The following connectors are located on the CPUB( )-U13
ETU.
✆ CN1 Connects to the backboard
✆ CN2 Connects to the ISA-bus.
✆ CN3 Connects to CN2 on the EXP-U13 ETU
via the expansion cable
✆ CN4 Connects to the memory backup battery
via the battery cable (factory installed)
✆ CN5 Connects to CN1 of the CLKG-U13 Unit
✆ CN6 Connects to CN2 of the CLKG-U13 Unit
3.1.5 LED Indications
LED1 indications are listed below.
✆ Blinking Red Normal Operation
✆ Steady Red Operation Stopped (power still on)
✆ Off No Power
LED2 indications are listed below.
✆ Steady Red System Power On
✆ Off No Power
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