Matrix Orbital PK202-25 - Manual (Page 18)

GND D
a
ta
+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 240 ohm current limiting resistor and the electronic
switch to ground.
Figure 17: General Purpose Outputs
Maximum allowable current is 20 mA, 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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