DESCRIPTION AND OPERATION
LOGIC POWER
I-E96-313A
2 - 5
Default Data
Default data is two 8-bit bytes sent to the default registers. It is
set by the master module configuration (FC 128). The function
of this data is the same as the output data but is used only
when a
time-out
occurs.
LOGIC POWER
Logic power (+5 VDC) drives the DSO circuits. It connects
through the top 12-pin card edge connector (P1) shown in Fig-
ure
.
BUS FAULT TIMER
The bus fault timer is a one-shot timer that is reset by the slave
expander bus clock; the master module generates the bus
clock. If the clock stops (indicating a master module error or
failure), the bus fault timer
times out
in 10 milliseconds. This
causes the digital outputs to change to their default values. A
red front panel status LED indicates a bus fault (
time-out
).
STATUS LED INDICATOR
A front panel module status LED indicator shows the operating
state of the DSO. Circuits on the DSO determine the module
status and light the LED accordingly.
explains the
indications and
explains corrective actions to take.
