Quote:
Originally Posted by Danny_Ocean
I need (want?) to be able to activate a 12vdc relay remotely via the internet. I know how to wire the relay at the source, but how do I connect/control the contact via Internet?
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You need a PLC (programmable logic controller) set up. Configured for a static IP, connected to a router or to an Ethernet hub/switch off an existing router. Basically you need to set up a private network that has full time Internet connectivity. You also need a power source and logic output modules. The source feeds the input side to the output module. The PLC commands the output module to source the voltage to your relay.
There might be a PC based card that will do the same thing. In that case your CPU would always have to be on with VPN capability from your remote PC.