Since I've made a due and diligent search of the internet and not found any info on set up of an NTE3100 Photo Coupled Interupter Module, Transistor Output, I'll post it here. Surprisingly, http://www.nteinc.com has no data sheets on their own product. I found enough at the local public library in a giant book of electronic circuits.
|+5VDC |+5VDC
\ \ Both Resistors
/ / 1 K ohm
\ \ Brown, Black, Red
/ /
| |
\| ---
| <-\ /
/| <-v
| ---
| |
Signal out----+------+ +----+
\ |
/ 1 Mega Ohm |
\ Brown, Black |
/ Green |
__|__ __|__
___ ___
_ _
As prefered, simple pictures are in ASCII art since you never know when someone is trying to read this from a VT100 terminal in the middle of nowhere. The 1 Meg resistor may be optional, will depend on your application. If everything is working right, the signal out will switch from 0 to 5 volts when the channel is blocked. A single sheet of paper won't do it, it needs something more opaque.
This circuit will also work for the NTE 3102.