Operating instructions

19
Digital I/O Interface
The Checkweighing application sup-
ports the digital input/output-interface.
There are 4 control lines, or outputs,
which are activated as follows (see also
the diagram below):
– Lighter
– Equal
– Heavier
– Set
In Setup, under:
Application:
Checkwgh.: Act.Ports
you can define whether these control
ports are
– off
– always on
activated at stability
– on within the checkweighing range
– activated at stability within the check-
weighing range
The “SET” output normally changes its
voltage level when the load is near the
target weight. Alternatively, you can
assign the “Ready-for-use” function to
this port. Configured in Setup under:
Application:
Checkwgh.: Set output
This makes it possible, for example, to
connect a simple indicator for weighing
or calculation results, similar to the 3-
segment checkweighing display on the
Combics 3 indicator.
All data output ports have a high volt-
age level when:
– The application has not been initialized
– The weighing instrument is not at sta-
bility and one of the “at stability ...”
parameters is selected
– The weight is not within the check-
weighing range
Digital I/O Interface
– <SET> control output: set
– Activation of port lines: always on
Digital I/O Interface
– <SET> control output: set
– Activation of port lines: within check-
weighing range
Output port specifications
– When not in use, the voltage level is
high: 3.7 V/+4 mA.
– When actived, the voltage level is low:
<0.4 V/4 mA.
! The output ports are not protected
against short circuits!
Target weight
Checking Range
Lower
limit
Upper
limit
30 %
170%
Equal
Set
Lighter
Heavier
Ready to operate
Target weight
Lower
limit
Upper
limit
30 %
170%
Equal
Set
Heavier
Lighter
Checking Range
Ready to operate