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Contact Closure I/O over fiber testing scenario

Like we have been discussing in this post, video over fiber equipment is really versatile solution that AD-net is offering to endusers all over the world.

However, not that much is discussed or written till now about such feature as contact closure and it’s application over fiber. And this is where our customization abilities in our own lab really helps a lot.
Contact closures usually are refereed  as ‘relays’, which are used in industrial control systems, where simple I/O logic on/off are needed. So, there are programmable logic controllers in fact. Frequently control attached devices (pumps and valves in my case) that are really either ‘on’ or ‘off’. These are typically turned on with a relay. Basically, the relay is made up of two parts. A coil and a contact. The coil has a charge sent through it which causes the contact to close. When the contact is closed, it closes the circuit allowing the loop power to flow to the device.

And then when you place order to AD-net, ordering something with contact closure, what is important to know, whether you will need Normal Open (we call it N/O) or Normal Close (N/C) units.

This depends on your end equipment that will be connected to fiber muxes we will supply.
Now, here’s a sneak peak of how we can customized and immediately test contact closure I/O applications in our lab.


contact closure tester 1


In this case you can see we have 2 video over fiber multiplexer boards with I/O contact closure features as lotus type green connectors. Now, we can connect them to test contact closure source alarm equipment like this:


contact closure tester 2


This is similar to how your real life applications will look like. Inside the bigger metal box, it is the contact closure signals source, in our test case it works like the sensors in end users projects. When something happens, and alarm is generated it will send signals, and change state of a controller. In our testing, we use a remote controller to let it send signals as we wish. Then, if you wonder further – white plastic box, it is the alarm with some relay switch inside, when it get’s the signals from the sourcing, it will switch to ON from CLOSE or switch to CLOSE from ON ( it is according to our selection for N/O or N/C we explained above ) and makes the alarms by voice or red LED lamps. Finally you can see, there are 1 2 3 4 5 ….channels, it allows us to test 6 channels at the same time.

This is a simple but powerful way to demonstrate I/O contact closure to your customers as well.

Want to discuss about I/O closure over fiber? Just get in touch by filling form on this page!


Lomoveishiy – Finland

I needed those to connect my PC on the third floor to have internet access in that room, and ISP installed their modem on the first floor only. After dropping fiber patch cables, plugged in all cables into these media converters at both sides, and link came up instantly. Was much easier than I thought!

Raymond – USA

Great experience – units worked straight out of the box – just needed plug in cables and we were done. I also like the possibility to enable jumbo frames, while we do not have a need for this feature at the current moment it’s great to have this option.

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