When would I use RS232?
You would use the RS232 when you wanted to trigger the VoiceOff audio unit or a relay through the Kontrol & Kommand device from your alienDVR.
For example, you can send a signal via the CCTVWindow software to the DVR to open RELAY 1, for 2 minutes. You may use this option to perhaps open a gate for a visitor. Or you may send a signal to RELAY 9 (second K&K module) to close for 3 hours which overrides a central heating controller so the building is all toasty when you get there. You might even trigger RELAY 3 to open for 9 minutes to trigger a siren because you have spotted intruders.