AutoGRAPH ON-BOARD CONTROLLER • USER MANUAL
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TechnoKom © 2016
Connection of Digital Inputs 1...4
(active low)
AutoGRAPH controllers has four active low digital inputs: two inputs – on power supply
connector (pin 3, pin 7), two inputs – on 4/6-pin CAN / 1-Wire / Output 2 / Inputs 3-4 connector
(pin 10, pin 13).
Active low digital input has two states:
logical «1», when the input is connected to the supply voltage or open-circuit.
logical «0», when the input connected to the ground. This state is considered to be active.
The input is able to show change of the input state, count pulses and measure frequency and
is intended to connect various dry contact sensors to the tracker. Ensure that the sensors are
in good order and able to maintain reliable operation. The manufacturer shall not bear any
responsibility for incorrect state recording of these sensors (chatter, loss of contact and etc.).
It should be noted that all voltage levels of active low digital inputs under 5 V shall be considered to
be logical ‘0’, while all voltage levels above 6 V shall be considered to be logical «1» . If the input is
disconnected it shall denote logical «1» .
It is convenient to connect the active low digital input to an emergency oil pressure relief sensor to
control the engine performance. In this case, the AutoGRAPH dispatch software shall enable metering
of engine hours and application of various filters related to the engine’s operating time. For example,
«Skip the coordinates» filter when the engine is shut down reduces traffic and filters coordinate drift at
stops when the engine is not running.
IMPORTANT
i
NOTE
Internal Connection Diagram of Active Low Digital Input
Internal connection diagram of the active low digital input is shown in the picture below:
AutoGRAPH controller
DIGITAL INPUT
(active low)
LIMIT SWITCH
or SENSOR
