Connection to the input NI9403

Hello

I use a NI 9403 DIO module in my project.  I want to connect to one of the DIO pins as output, at the end of the collector of the optical switch PC845.  The output level would be defined of salvation or + 5v.  Then take the transmitter of the optical switch up to an another rod of DIO, as input.  Can I do this without using the current limiting resistors?  Current limit is the NI 9403 module it is out?  If I use a value, what value can be used with the drop of resistance that is located on the entrance?  What is the value of the resistance to pull-down on the inputs?  I don't see a specification for it in the manual.  Basically, I want to use the optical switch to allow a DIO output to the reader that the condition of the OID of entry based on the switch is enabled or not.  The PC845 has a Vce = 1v.  Or I'll have to set up the circuit in the traditional open collector configuration?

Your help is greatly appreciated.

Todd Moore

Hi Todd,

You should be able to connect the collector directly to a digital output and line from the transmitter directly to a line of input.  When the optical switch is active, it is similar to the pines and DI being short-circuited together.  This will not cause the device to a source or sink more current than it can handle.

You can find information on over-current and short-circuits on page 9 of the Manual: http://www.ni.com/pdf/manuals/374069e.pdf#page=9

Kind regards

Tags: NI Hardware

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