SIS Documentation
SIS3800
Scaler/Counter
Page 11 of 39
6 Front Panel LEDs
The SIS3800 has 8 front panel LEDs to visualise part of the units status. Three LEDs
according to the VME64xP standard (Power, Access and Ready) plus 5 additional LEDs
(VME user LED, Clear, Overflow, Scaler enable and VIPA user LED).
Designation
LED
Color
Function
A
Access
yellow
Signals VME access to the unit
P
Power
red
Flags presence of VME power
R
Ready
green
Signals configured logic
U
VME user LED
green
To be switched on/off under user program control
CLR
Clear
yellow
Signals soft or hardware clear
OVL
Overflow
red
Signals Overlow in one or more channels
S
Scaler Enable
green
Signals one or more enabled channels
VU
VIPA user LED
green
for future use
The LED locations are shown in the portion of the front panel drawing below.
The VME Access, the Clear and the Scaler enable LED are monostable (i.e. the duration of
the on phase is stretched for better visibility), the other LEDs reflect the current status.
An LED test cycle is performed upon power up (refer to the chapter 17.1).
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