3.4.27 Digital Input Menu
Main Menu → Communications Menu → Digital Input Menu
This menu is used to remotely trigger zero and span calibrations. This is done by assigning the eight
digital inputs with one of the following commands.
Figure 69 – Digital Input Menu Screen
Associates an action with a digital input. There are eight digital inputs
(the pin numbers are for the 25 pin connector). Each one can have one
of the following associated actions, triggered when the corresponding
digital input goes to the Active state:
Disabled: No action (this digital input does nothing).
Do Span: Used to perform a span precision check. When activated the
instrument sets the Cal. Mode to Span (refer to Section 3.4.10).
Do Zero: Used to perform a zero precision check. When activated the
instrument sets the Cal. Mode to Zero (refer to Section 3.4.10).
Each pin can be set to be active High or Low. Active High means that
the event will be triggered when the line is pulled to 5 V. Active Low
means that the event will be triggered when the line is pulled to 0 V.
Example
Here is a typical configuration between an instrument and either a data logger or calibrator (master
device):
1. Set the jumper JP1 to 5 V position (refer to Section 4.4.3).
2. Connect one of the master devices digital output signals to pin 18 and the ground signal to pin 5 of
the instrument’s analog/digital 25 pin female connector (refer to Figure 86).
3. Program master device to output 0 volts to pin 18 when a span is desired.
4. In the instrument’s Digital Input Menu assign DI 0 → Do Span - Accept.
5. The same procedure can be followed to also activate zero calibrations. Pin 6 of the instrument’s
analog/digital 25 pin female connector can be connected to one of the other master devices digital
outputs and the instrument can be set so DI 1 is assigned to Do Zero.
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