Digital Inputs - Intab PC-Logger 3100i How To Use Manual

1.2 Digital Inputs

Eight digital inputs are available. Input status of these can be monitored by the
computer.
This way you can measure temperature and at the same time make sure that
control signals assume the correct level at the right time.
Six event counters can be paralleled with these inputs.
By connecting pulse type transducers (flowmeters are often of this type) to
these inputs you will get values that represent pulses/time interval. This is the
easily transformed into litres per second.
The "3100i" software can be said to be treating these values as if they were
ordinary analogue values or voltages.
The digital inputs are on request fitted with filters for electrically noisy
environments.
Digital input status is reflected in channel 31.
The binary sum of active inputs are presented with DI1 as LSB.
1.2.1 Opto isolated inputs
The Opto isolated inputs (DI1 - DI8) are used to detect high-level (>10V)
signals or where isolation is essential.
The a and b inputs are equivalent and insensitive to reversal of polarity.
The auxiliary output (VO) will power the opto-couplers if no external source
is available. This output is connected directly to the mains adapter. Make sure
you have connected it if you want to use this output.
Remember also that you lose isolation when you use VO.
1.2.2 TTL-compatible inputs.
TTL- or low-level signals are connected to the so called pulse inputs (P1-P6).
These are paralleled with the corresponding DO inputs and do not provide any
isolation to the measured/monitored object.
The auxiliary power output for these inputs is Vp.
This voltage is derived from the internal battery through a current limiting
resistor
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