I am using a Axicom D2n Relay
The external power supply reads 10V and runs through a chip, it's origins I was not told and neither was a name stamped on the chip, but the voltage at the end and connecting to the relay setup is 5V. A BNC line also is attached to the same chip with a switch, kinda of like an on and off button. I was told that the BNC operates as a TTL signal. I found where this switch alters voltage and connected to the relay as shown as "BNC". The chip ending had four wires, a ground, the 5V power line, the line where the TTL signal transmits, and a fourth line that I think is TTL output I haven't figured it out yet neither have I used it. Sorry for not posting a circuit and also going off topic of Arduino. I'm running tests for the Shutter and seeing how hot it gets (or how long before it breaks) before we actually use it for experiments.