The open-collector outputs require the use of an external resistor properly sized to limit current to a value
below 300 mA, as shown in Figure 16.
Figure 16: Connection diagram of the open-collector electrical outputs
To scale the resistor use the relationship:
Where Vc is the external voltage to be switched by the open-collector output.
The resistor power should be adequate for the voltage and current values to be switched, i.e.
Do not connect the open-collector electrical outputs without an external resistor properly sized or another
appropriate mechanism to limit current.
2.12 Optical Outputs
RT430 has 2 outputs for multimode optical fiber, shown in Figure 17.
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