Invengo XC-RF300, Руководство пользователя

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6.2.4 Using Outputs
The reader outputs are Open Drain, N-Channel (when activated, an output is
tied to the ground).They can drive a current up to 1.4A, and accept voltages up
to 28V. Outputs are internally pulled-up to 3.3V with 1KOhms resistors and are
protected against overload and overheat. Applying negative voltage to outputs
(polarity inversion) may destroy them.
Figure 6.4 below demonstrates how to connect an external load to an output.
Figure 6.4 Connecting a totem-pole output sensor to input #1 or #2
External devices must be connected to GPIOs in compliance with Table 8 and
SELV requirements.