Eurotech ReliaGATE 10-14 Series, Руководство пользователя

Страница: 73 / 90

ReliaGATE 10-14 User manual Rev. 0-10 12 How to use the interfaces in Linux
12.10 The Ignition Key
The ReliaGATE 10-14 includes an ignition monitoring circuit which can be used in battery-operated
applications.
Whilst the ignition input is low, the ReliaGATE 10-14 is powered OFF and will not drain the battery.
The Ignition Key is a digital input that enables the product to be turned ON/OFF according to the following
operating principle:
A DIP-switch (SW# 1) in the Service Panel allows control the Ignition Key control functionality:
l
DIP-switch ON: Ignition Key control enabled
l
DIP-switchOFF: Ignition Key monitoring only
See also "DIP-switches meaning" on page 44 .
SW# 1 Ignition Key Status Key Signal Level Product Status
ON From OFF (GND) to ON (VIN+) Rising edge The product turns ON
ON From ON (VIN+) to OFF (GND) Falling edge The product turns OFF after 120 seconds (default condition)
OFF - - Product turns ON when power is applied and OFF when
power is removed
Two GPIO lines are used to interface with the ignition monitor:
ignition_input Reflects the state of the Ignition Input pin on the power connector.
ignition_latch When enabled, prevents the ReliaGATE 10-14 from powering OFF immediately when ignition_input goes
OFF.
ignition_latch is enabled by default.
The table below shows the GPIO line associated with each IO:
Line GPIO Link Name
ignition_input 123 /dev/ign_input
ignition_latch 109 /dev/ign_latch
73 / 90