Re: How to wire output on one device to input on another device

PaulKraemer wrote: 
Hi,

I have a device (#1) that has a digital input.  In order to put this
input in the "ON" state, you have to connect the input pin the the
ground pin on the device.


That is called an "active low" input.

I have another device (#2) that has a digital output. It is described
as an open-collector MOSFET output rated for up to 170 mA and 40Vdc. According to the manual, an "on" condition is a 5-ohm resistance to
ground. An "off" condition is an open-circuit.

That is an "active low" output intended to drive loads connected between it and a positive supply.

I want to wire the output on device #2 to the input on device #1.  Can
anyone tell me how I can do this and if I need any additional parts
besides wire.

Assuming there is no problem connecting the two system grounds together, you do that, tie the output to the input and add a pull up resistor to that line (say, 4.7 k ohms to a + 5 volt supply) so that when the output goes open circuit, there is something to make the input voltage positive. The pull up resistor may already be connected to the input, internally. Check the input voltage to its common, with nothing else connected. If it is near 5 volts, then this is the case.
.

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