17.4 APPENDIX D – GPIO PORT
The SubD connector 15pole HD GPIO place on the rear of Macrotel, provides 4 inputs General Purpose and 4 outputs
General Purpose binary. The inputs are polarized on Opto coupler while the outputs are open collector. They can be
used to send commands to Macrotel and perform certain functions. The inputs are constituted by photocouplers
polarized on each input and is always inserted, inside, a protection resistor 150 ohms in series. The maximum current
that can flow on each photo coupler is 20mA. The voltage supplied between pin 9 and pin 1 is +5 Vdc unregulated.
17.4.1 Connection to GPIn and GPOut via internal activation (Relay)
As shown in the diagram below, taking the tension inside the apparatus it is possible to polarize a photo coupler and
implement one of the 4 GP Input available. By taking the +5 V from pin9 and applying it to the anode of a photo coupler
and then connecting the katodo common (pin 7) to the mass represented by pin1, then you will implement the function.
See this section on the switching mode from an external command, represented by a relay or a switch.
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