AutoGRAPH ON-BOARD CONTROLLER • USER MANUAL
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TechnoKom © 2016
Connection of High-impedance
Digital Input
AutoGRAPH-GSM+, AutoGRAPH-GSM+WiFi and AutoGRAPH-WiFi controllers have one
high-impedance active high input (pin 26 on the 6-pin RS-232 / RS-485 / RPM / Input 9
interface connector).
High-impedance digital input is intended to connect a device with a voltage output to the
tracker.
The high-impedance input has two states:
logical “1” – when input voltage is greater than 7 V;
logical “0” – when input voltage is lower than 3 V.
If the high-impedance input is open-circuit it shall denote logical “0”.
Internal Diagram of High-impedance Input:
AutoGRAPH controller
The input resistance of the high-impedance input is 1 mega-ohm (1MΩ).
The cut-off frequency of the input low-pass filter is 5,000 Hz.
External Connection Diagram of High-impedance Input:
INPUT 9 – PINK (26)
Digital voltage
output sensor
+ U sensor
power supply
