Advantech USB-4750 Manual do Utilizador descarregar pdf (Página 21)

15 Chapter 3

3.3.2 Isolated Digital Output Connections

Each of 8 isolated digital output channels comes equipped with a Darling-

ton transistor. Every 8 output channels share common collectors and inte-

gral suppression diodes for inductive loads. Channels 0 ~ 7 use COM0,

and channels 8 ~ 15 use COM1 as a common pin. If an external voltage (5

~ 40 V) is applied to an isolated output channel (IDO 0 ~ IDO 15) while it

is being used as an output channel, the current will flow from the external

voltage source to the card. Please take care that the current through each

GND pin not exceed 100 mA.

Figure 3.3 shows how to connect an external output load to the card's iso-

lated outputs.

Figure 3.3: Isolated Digital Output Connections

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