# Nidaq dio

**URL:** <https://mworks.discourse.group/t/nidaq-dio/561>\
**Category:** Support\
**Created:** [September 16, 2014, 1:24pm UTC](https://mworks.discourse.group/t/nidaq-dio/561 "2014-09-16T13:24:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [September 16, 2014, 1:24pm UTC](https://mworks.discourse.group/t/nidaq-dio/561/1 "2014-09-16T13:24:35Z")

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Hi Chris,  
I have trouble with digital I/O channel in MWorks.  
how to assign the input or output in the same port? can you come sometime tomorrow morning? thanks!

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [September 16, 2014, 1:39pm UTC](https://mworks.discourse.group/t/nidaq-dio/561/2 "2014-09-16T13:39:07Z")

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Hi Jing,

Unfortunately, the National Instruments driver that MWorks uses ([NI-DAQmx Base](http://sine.ni.com/nips/cds/view/p/lang/en/nid/14480)) does not support using a single port for both input and output. A given port must be all input lines or all output lines, not a mixture of the two.

However, MWorks _can_ use multiple NIDAQ devices in a single experiment, so if you need additional digital channels, you can add another DAQ to your setup. See [this article](https://mworks.discourse.group/kb/io-devices/setup-for-using-ni-daq-devices) for the list of devices supported by NI-DAQmx Base, which includes some relatively low-cost USB DAQ’s.

Cheers,  
Chris

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [September 16, 2014, 9:03pm UTC](https://mworks.discourse.group/t/nidaq-dio/561/3 "2014-09-16T21:03:48Z")

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Thanks! I will use second port.

- Jing

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**Author:** ![cstawarz](https://yyz1.discourse-cdn.com/flex031/user_avatar/mworks.discourse.group/cstawarz/32/3_2.png) [@cstawarz](https://mworks.discourse.group/u/cstawarz)\
**Post date:** [July 19, 2022, 10:57pm UTC](https://mworks.discourse.group/t/nidaq-dio/561/4 "2022-07-19T22:57:31Z")

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