NI USB-6501 User Guide - National Instruments

Push-pull Active drive The default configuration of the NI USB-6501 DIO ports is open collector, allowing 5 V operation, with an onboard 4.7 kΩ pull-up resistor. An external, user-provided pull-up resistor can be added to increase the source current drive up to a 8.5 mA limit per line, as shown in the following figure. ................
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