User`s guide

Option 750, External Relay Control
and RI/DFI (RI latches)
The 662xA with Option 750 has
an 8-pin port dedicated to the
control of up to four external
relays and a 4-pin port dedicated
to RI/DFI. The N6700A main-
frame comes standard
(no option required) with a
4-pin port that is user pro-
grammable to one of three
functions— RI/DFI, digital I/O,
or triggering. Digital I/O and
triggering are not available in
the 662xA.
External Relay Control
External relay control as
provided in the 662xA with
Option 750 is not supported
by the N672xA. The 4-pin digi-
tal port, when configured for
digital I/O, can support control
of up to 3 external relays, not 4
as in the 662xA. The compati-
bility commands associated
with external relay control
are not implemented and will
produce an error. If you would
like to control EXTERNAL
relays through the digital port,
the Standard Commands for
Programmable Instruments
(SCPI) language must be used.
Refer to the N67xxA User’s
Guide for information on how
to configure the digital I/O
port for this use. If interested
in INTERNAL relays, please see
the Options Not Available for
the N672xA section at right
for information on Option 761,
output disconnect relays.
RI/DFI
When the N6700A’s digital I/O
port is configured for RI/DFI,
the operation is the same as in
the 662xA with Option 750.
Please see the N67xxA User’s
Guide for information on how
to configure the digital I/O
port for RI/DFI.
Option S50, Relay Control and
RI/DFI (RI does not latch)
The 662xA with Option S50 is
the same as Option 750 shown
above, but the Remote Inhibit
(RI) does not latch.
External Relay Control
External Relay Control is the
same as described in Option 750.
RI/DFI
When the N6700A’s digital I/O
port is configured for RI/DFI, the
non-latching RI functionality
provided in the 662xA with
Option S50 can be enabled
on the N6700A by using the
“OUTPut:INHibit:MODE LIVE”
command. This functionality
has been made available in the
N6700A’s firmware. The default
mode for RI is “OUTPut:
INHibit:MODE LATChing”.
Options Not Available
for the N672xA
Options 054 and 761 for the
N675xA and N676xA
The N672xA model numbers
were set up in order to provide
a smooth transition from the
662xA models to an N67xxA
MPS. However, if you do not
see exactly what you need to
replace your 662xA, or you
would like to take advantage
of some of the N67xxA MPS’s
enhanced features, there is
most likely an N67xxA MPS
combination that will suit you.
Although there are no options
available for the N672xA mod-
els, there are options available
for the N675xA and N676xA
modules. For example,
Option 761, INTERNAL output
disconnect relays, may meet
your needs if you were previ-
ously controlling EXTERNAL
relays connected to the 662xA’s
outputs. Also, Option 054,
high-speed test extensions,
which provides digitized output
measurements and output list
capability, is available for these
modules. Option 054 is standard
on the N676xA modules.
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