Measurement Computing Analyzer488 - Manual (Page 51)

Section 3 Front Panel Operation
3.5
Enable (REN) bus management line. It does not
necessarily indicate the driven state. A
¼
indicates that
the line is asserted, blank means that the line is
unasserted.
IFC The IFC digit indicates the actual state of the Interface
Clear (IFC) bus management line. It does not necessarily
indicate the driven state. A
¼
indicates that the line is
asserted, blank means that the line is unasserted.
3.5.2 Front Panel LED Indicators
LED indicators on the front panel show the current display mode,
a recording ON LED, and the state of the three handshaking lines.
BUS The BUS LED indicates that the Analyzer488 is in the bus
display mode, displaying information directly from the IEEE
488 bus. Changing the display mode is accomplished by
using the [VIEW] key.
MEMORY The MEMORY LED indicates that the Analyzer488 is in the
memory view mode, displaying information from the record
memory. Changing the display mode is accomplished by
using the [VIEW] key.
RECORD The RECORD LED indicates that the Analyzer488 is
recording bus events into the record memory.
NFRD The NFRD LED indicates the logical state of the Not Ready
for Data (NRFD) handshaking line. The LED is on when the
NFRD line is asserted. This LED indicates the real-time state
of the bus, even when viewing recorded data.
NDAC The NDAC LED indicates the state of the Not Data Accepted
(NDAC) handshaking line. The LED is on when the NDAC
line is asserted. This LED indicates the real-time state of the
bus, even when viewing recorded data.