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4.3.3.1.1
Pin Assignments:
The options for each PIN are: Not Used Input or Output
NOTE:
These instructions are the same for NPN and PNP with the exception of the transistor
wiring and operation.
For example: For NPN the idle state is switch 'open' which will be a high Volt output if there is
a pull-up in the circuit. PNP would be the opposite, at zero Volt.
4.3.3.2 NPN Output / PNP Output
If Output is selected in Pin assignments, the output options are:
•
Pulse
•
Single or Dual flow alarm
4.3.3.2.1
Pulse:
Enter the number of pulses per unit volume
required. This figure can be adjusted to suit the
application and the flow range required from the
meter.
The maximum output frequency is 5000 Hz so care
must be taken to ensure that this pulse rate is not
exceeded.
Details of how to connect the outputs can be found in Section 3.1.1
NOTE:
There are two options for the Pulse Output:
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Each of the PIN Assignments can be configured as an
output function or not used
The operation to modify NPN Output and PNP Output
is identical within the software, with the exception of the
type of transistor pulse output.
The options for each PIN, are:
Not Used or Output
•
Asynchronous
In this mode the meter measures
according to the analog response time
and sends pulse (NPN/PNP) output
after that period at 50:50 ratio.
•
Synchronous
In this mode the Pulse output
(NPN/PNP) is sent directly on receipt of
the second pulse edge received.
The pulse output is direct 50:50 ratio or
can be set to a specific pulse width(ms).
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PulsiteLink_Instruction_Manual_0722
16
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