Discrete Fault Indicator Configuration; Figure 3-5, Eprom Insertion Position - Racal Instruments 1260-00C User Manual

1260-00C User Manual
Discrete Fault
Indicator
Configuration
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2764,
27128,
27256,
EPROM
27512

Figure 3-5, EPROM Insertion Position

The 1260-00C comes with a MATE-compatible Discrete Fault
Indicator (DFI). The 1260-00C monitors the status of the VXIbus
SYSFAIL* signal and relays the status to pins 1 and 6 of the RS-
232 serial port (see Appendix D, Connectors, in the back of this
manual.
As shown in Figure 3-6 and Table 3-6, switch S17 determines the
relationship between the SYSFAIL* signal and the serial port pins.
If S17 is in the OFF position, the 1260-00C DFI is set to the
normally open mode. Therefore, if SYSFAIL* is not asserted while
the backplane is powered up, pins 1 and 6 will present an electrical
open-circuit. In contrast, if the backpane is unpowered or
SYSFAIL* is asserted, pins 1 and 6 will present an electrical short-
circuit.
If S17 is in the ON position, the 1260-00C DFI is set to the
normally closed mode. Therefore, if SYSFAIL* is not asserted
while the backplane is powered up, pins 1 and 6 will present an
electrical chort-circuit. In contrast, if the backplane is unpowered
or SYSFAIL* is asserted, pins 1 and 6 will present an electrical
open-circuit.
Expansion
EPROM
Socket
or
Operation 3-9