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3.5General IO ports
General IO ports of the MIELTA M1 can operate in the following modes (see table 3).
Table3.Unversalports modes
Voltage measurement, 0 –36 V
Frequency measurement, 1Hz –40 kHz
Low frequency measurement, 0.1Hz –40.0 Hz
Counter,frontedge, 0 –999999
Counter, backedge, 0 –999999
Encoder (Port1 + Port2), 0 - 999999, increment, decrement
Alarm button, 0/1, track point saving
0/1, i-button key activation, odometer impulse generator
The analog input is designed for voltage measurement and registration of slowly
changing signals. Measurement of signal level occurs 20 times per second. The data
smoothing algorithm is applied.
When you activate the ignition control function, you can select the signal source is
one of universal ports either power network. In this mode, the Tracker monitors voltage and
modifies the Boolean value of the "IGN" when passing through the established threshold
voltages.
Binary input, designed to work with sensors and signal sources open collector type.
High signal level limited voltage 36 V, low level should be no more than 1 V from GND. The
Tracker has an internal pull-up to + 3.3 v.
In some cases, to improve anti-jamming and ensure a minimum load current of
a frequency output of the external appliance, you must be connected pullup
resistors with nominal 4.7-10 kOhm between the signal wire and power plus (no
more than 36 V).
Tracker has two modes of frequency measurement - high and low, two modes of
counting pulses with synchronization on the front and the recession signal, as well as logical
status mode entry (entry by the mass closure gives «1»).
Encoder mode uses two ports simultaneously and can keep counting pulses from 0 to
999999 in two directions (increment, decrement). Used, for example, for compensation of
oscillating movements of flow sensors.
Digital output is built according to the scheme "open collector" and is intended for
actuating devices control. The following operating modes:
manual mode (switch output status by the command);
identification mode (change status to detect the iButton keys/RFID cards out
of the allowed range);
