Matrix-orbital LK202-25 Legacy Manual do Utilizador descarregar pdf (Página 18)

GND

Data

+5V

Figure 16: 1-Wire Pinout

2.3 General Purpose Outputs

The display has six general purpose outputs. These are provided to control relays or other electronic de-

vices. This allows external devices to be turned on or off using the PC or controller and software commands.

Each output is wired as shown in the Figure below. The + terminal is connected directly to the module

positive supply, the - terminal is connected through a 240ohm current limiting resistor and the electronic

switch to ground.

Figure 17: General Purpose Outputs

Maximum allowable current is 20mA, which is enforced by the current limiting resistor. If the device

being switched has a resistance of 240 ohms or more the corresponding resistor may be shorted. Solder a

small jumper wire (wirewrap wire is good) from the feedthrough hole to the corresponding negative pin for

the GPO in question.

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