I have two cfp-2220 that I want to connect with each other using the DIO's of 5V that they have.
The problem that I have is that I don't know the impedance to connect the CFP2220-1 Digital Output 1 to a relay for switching the CFP2220-2 Digital Input 1.
I am using a relay for interfacing the signal. This relay needs 34mA 5V to operate. I am not sure if the CFP2220 would have the needed power to turn the relay on and to close the contact that will operate the CFP2220-2 Digital Input 1. In the user manual of the CFP2220 does not mention anything about it.
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Are you sure you need a relay? Do the two systems share a 24VDC supply?
If they share a supply in a way that prevents ground potential differences, I think you could connect the input directly to the output. Hopefully someone will verify this before you attempt it.
Yes they share the 24VDC power supply. I am not sure if I would need a pull down resistor. I don't have the information about the inputs and outputs because the manuale is vague.
Here is the current specification for the digital outputs on the 2220: http://digital.ni.com/public.nsf/allkb/0147137D244