Chapter 2
Configuration and Startup Procedures
2-10
ni.com
Figure 2-5.
EPROM Insertion Position
Discrete Fault Indicator Configuration
The GPIB-VXI/C comes with a MATE-compatible Discrete Fault
Indicator (DFI). The GPIB-VXI/C monitors the status of the VXIbus
SYSFAIL* signal and relays the status to pins 1 and 6 of the RS-232 serial
port. Refer to Appendix D,
, for more information.
As shown in Figure 2-6 and Table 2-6, switch S17 determines the
relationship between the SYSFAIL* signal and the serial port pins. If S17
is in the OFF position, the GPIB-VXI/C 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 backplane is unpowered or SYSFAIL* is asserted, pins 1 and 6 will
present an electrical short-circuit.
If S17 is in the ON position, the GPIB-VXI/C 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 short-circuit.
In contrast, if the backplane is unpowered or SYSFAIL* is asserted,
pins 1 and 6 will present an electrical open-circuit.
EPROM
2764,
27128,
27256,
or
27512
Expansion
EPROM
Socket
