Internal Pull-up Pull-down Resistor Values on Digital I/O Lines of DAQ Devices

Overview

This article explains which Data Acquisition (DAQ) devices use internal pull-up/pull-down resistors on their digital I/O lines and what their values are.

Introduction

The table below shows general values for resistors in either pull-up or pull-down configuration.

Note: Not all devices in a single family will have these values. Please consult your specific device's specifications document for the most accurate information.

 

Device Family/Name Pull-up/Pull-down Resistance

X Series

Pull-down

50 kΩ

M Series

Pull-down

50 kΩ

E Series 1

Pull-up

50 kΩ

S Series 2

Pull-up

10 kΩ - 100 kΩ

NI USB-6001/2/3

Pull-down

47.5 kΩ

NI USB-6008/9

Pull-up

4.7 kΩ

NI PCIe-6509

User-defined 3

See User Guide

NI 4350/1

Pull-up

10-100 kΩ

Legacy Devices
Device Name Pull-up/Pull-down Resistance

NI-6533/6534

User-defined 3

100 kΩ

PC-DIO-24/96

User-defined 3

100 kΩ

PCI-DIO-96

Pull-up

100 kΩ

AT-DIO-32F

Pull-Up (IN1, IN2 only)

4.7kΩ

AT-MIO-16D/16DE-10

Pull-up

100 kΩ

PC-LPM-16

Pull-up

10 kΩ

DAQCard-700

Pull-up

10 kΩ

Some E Series devices have a second chip (the 8255) that provides   additional digital lines. On these devices, port 0 uses a 50 kΩ pull-up resistor while ports 2, 3, and 4 use a 100 kΩ pull-up resistor.
2 6115/612x/613x only

The DIO-24/96 and the USB-6503/6509 cards allow jumper-selectable pull-up/pull-down configuration. The NI-6533/6534 family of devices similarly allows the user to configure pulled up or pulled down DIO via the DPULL pin. See your user manual for more information.