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Logic input connections and front buttons
The previous page explained how to select the functions of the 3 logic inputs. You can
connect remote contact closures or open NPN collectors to activate these logic inputs.
The logic input provides a 5V DC signal. When you connect this to common, a current of
1mA will flow. Because this is a small signal, we recommend you use switches with gold
plated contacts, or self cleaning contacts, for best long term reliability.
The logic inputs are not galvanically isolated from the input signal.
The logic inputs are only activated when the lockout switch is ON
Signal I/P & Excitation
1
2
3
Set1
Set2
Digit
Max/Min
tare
=
Tares display to 0. Often used in weighing systems to zero a display prior
to making a measurement. Net weight is shown once tared. When a
display has been tared the small LED above the Set1 button will be
illuminated.
PV
=
Peak/Valley toggle. Allows you to view the maximum and minimum values
which have been displayed since last reset. 0% LED illuminates when
showing valley, 100% LED illuminates when showing peak.
rst
=
Reset. This clears any tare, peak, valley, alarm latch
HoLd
=
Freezes the displayed value for as long as the Hold input is closed
net.gro
=
Allows you to toggle between Nett and Gross values on the display
PA.1 .. 4
=
Page Addresses, if MEM option is installed.
28
OFF
4
5
6
ON
Output
Alarms
OK
Reset
Logic Inputs
Power
7
8
9
10
11 12 13
Normally open (disables front
panel Tare, Peak/Valley and
Reset buttons)
Normally closed (this enables
front panel Tare, Peak Valley and
Reset buttons also) Or simply link
NPN (could be opto-isolators if
you need the logic control lines to
be galvanically isolated from the
input signal.)
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