User`s manual

DIGITAL-LOGIC AG MPC40/A/B/C, MPC41 Manual V1.4C

4.5 Power on modes (startup modes)

4.5.1 Automatically power on

Modes:

1. Default startup mode: start from the “ ” button

2. Autostart: starts, when the main power is connected

Note:

Changing of the startup mode is possible only when the computer is powered (Standby mode), but

the computer is not switched on.

In “off” state of the computer the led “PRG” is flashing about 2 times per second, in “on” state this led is off.

If the computer starts automatically (it’s in mode 2), it’s necessary to stop booting by pressing and holding

the “ ” button during 4 sec.

Change the startup mode:

To change the startup mode, it’s necessary to push and hold the “SLEEP” button and press 1 (for mode 1) or

2 (for mode 2) times the button “ ”, then release the button “SLEEP”.

If mode was changed the led “PRG” will indicate it with fast flashing.

4.5.2 Remote ON/OFF with INGITION-Input

The computer may be started over an special control line, named as “IGNITION START”. This features al-

lows, to supply the computer always from the car supply, while the startup of the computer is done with the

signal IGNITION from the car. The control logic is as follow:

In the state computer=OFF

Input IGNITION = 0V no action

Input IGNITION = 12V computer will be switched ON, the bootprocedure starts

In the state computer=ON

Input IGNITION = 0V no action, computer stays in running mode

Input IGNITION = 12V no action, computer stays in running mode

The logic levels of the IGNITION input is defined as follow:

Low level: < 2Volts

High level: 8V to 28Volt

Protection: optoisolated input with a load of 1k Ohms., reversepolarity protected

See also chapter 4.3.1 (Power Supply Connector)