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LOCAL and DIG I/O-This
key places the Model 708 in
local (while in remote) or in digital I/O mode (while in lo-
cal). While in digital l/O mode, I/O status will appear on the
LED matrix (see Figure 3-3).
LOCAL-
With the Model 70X in remote, pressing LOCAL
returns the switching system to local mode (REMOTE off).
While in local, operation of all front panel controls are active
unless the Model 708 is in LLO (local lockout). For more in-
formation about local lockout, refer to paragraph 5.8.4.
DIG I/O-With
the Model 708 in local, press this key to
select digital I/O display mode (set Figure 3-3). Press this
key a second time to return to local mode from digital I/O
display mode. Refer to paragraph 3.2. I for information on
digital II0 display format.
RESET ~ Performs the same functions as cycling power
(all relays arc opened, triggers are disabled, RELAY STEP
to 000, MEMORY STEP to 001, etc.) with the exception of
power-up self-checking and master/slave loop initialization.
OPEN RELAYS ~ Turns off (opens) all prcscnt crosspoint
LEDs (if not in digital l/O display mode). COPY must be en-
abled to open relays automatically.
COPY DISPLAY-RELAYS
- Enables/disables automatic
copying of the displayed crosspoint configuration to the 1%.
lays. This causes any change to the crosspoint display to be
applied immediately to the relays. This pushbutton also tog-
gles the COPY LED (see paragraph 3.2.3) on and off.
3.3
Rear panel familiarization
The following paragraphs contain an ovcrview of the Model
708 Switching System rear panel (set Figure 3-5). In addi-
tion to the various connectors, IEEE-488 address selection
switches arc located on the rear panel. Masterlslavc configu-
ration and IEEE-488 (GPIB) addresses arc set using these ro-
tary selection switches. The rear panel of the Model 708
accepts plug-in cards when configured for ear panel card in-
stallation (see paragraph 2.2). When not conligured for rear
panel card installation, the rear panel contains the analog
backplane.
3-4
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