4
.
Interface I/O
Connections
2
(TRACK)
4
(COMMON)
2
(TRACK)
4
(COMMON)
2
(TRACK)
4
(COMMON)
TTL
Fig.
2
Track/
PEAK
Via External
Command (Switch, Open
Collector Transistor, or
TTL Logic)
Interface
Connector
Operation
The 8 pin rear connector provide
s
remote access to the
Peak operational parameters. All logic I/O are negative true
signals - logic common when active or true.
Functional diagrams of the logic for enabling PEAK
functions are shown in Fig.
3
thru
6
. Typically usage of the
I/O
connections are for remote control of the application
sequence
to "handshake" with a controller
for proper
operation
of
the measurement capture and resetting
process
of the PEAK Mode function.
Display
Source
and Front Panel TARE
button mode of
operation
l are available to provide remote
control enabling
of the local operation of the 3700 Peak feature
s as
configur
ed by the
7
postion
dip switch
settings as
described in section 2
.
Analog Output of the PEAK Mode function
is available. The
Analog level is depend
e
nt on the configuration of the main
analog controls of the 3700 unit... +/- 5 V or +/- 10 Vdc full
scale level.
Analog output
,
when in the HOLD or PEAK
capture mode
,
is accomplished using capacitive memory
and will have a "leak" rate of 1 millivolt per 10 seconds.
* For all
logic
I/O connections
: False condition is + 5 Vdc
internal pull-up
level, True condition is logic common
.
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