Unitech TASHI MT688 Guía De Referencia Rápida página 8

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D3+ and D3- are the positive and negative nodes of the external signal inputs.
D3+ = 3V ~ 12V,
D3- = GND
D3+ = 0V ~ 2V,
D3- = GND
D4+ and D4- are the positive and negative nodes of the external signal inputs.
D4+ = 3V ~ 12V,
D4- = GND
D4+ = 0V ~ 2V,
D4- = GND
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DIGIT-INPUT3 = High
DIGIT-INPUT3 = Low
DIGIT-INPUT4 = High
DIGIT-INPUT4 = Low
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