Black Box IEEE 1284 Guía de usuario descargar pdf (Pagina 96)

Page 96 of 98 The Black Box Toolkit

13.3. Individual line Specifications

13.3.1. Lines 1 & 2, Powered digital-in & passive switch closure

TTL input. A TTL signal (0-5V) can be connected to these lines, with ground connected to

the 3.5mm jack plug sleeve (0V) and the signal to the jack plug ring (input signal). Device

switch connections (eg. Joystick, mice etc.), can also be connected across these points as

long as the polarity of any voltage across the switch is noted and this voltage doesn’t

exceed 5V. Power can be taken from the 5V on the tip of the jack plug as long as the

consumption is limited to 50mA.

3.5mm stereo jack socket. Connection as detailed below:

• Tip: 5V (< 50mA)

• Ring: TTL signal

• Screen: 0V

The audio detection module (microphone) can be connected to these lines.

13.3.2. Lines 3 & 4, opto-detector

These 2 lines are intended only for the opto-detectors provided with this kit and provide a

connection from the amplifier within the Black Box Toolkit to their photo diodes.

• 2.5mm mono jack socket.

13.3.3. Lines 5 & 6, Powered digital-out

TTL output. The signal between the ring and sleeve of the 3.5mm stereo jack socket is

TTL (0-5V) and can be used to connect to any peripheral with an input expecting a TTL

signal. Power can be taken from the 5V on the tip of the jack plug as long as the

consumption is limited to 50mA.

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Black Box IEEE 1284 Guía de usuario Pagina 96