Honeywell HRSD40F250 User Guide - Page 28
Connecting Alarm Inputs/Outputs, AI 1 to 4 Alarm In, G Ground
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Figure 2-5 RS232 Port Connection HRSD40F DVR User Guide Connecting Alarm Inputs/Outputs Note To make connections on the Alarm Connector Strip, press and hold the button and insert the wire in the hole below the button. After releasing the button, tug gently on the wire to make certain it is connected. To disconnect a wire, press and hold the button above the wire and pull out the wire. Figure 2-6 Alarm Input/Output Connector Strips NO C NC G AI1 AI2 AI3 AI4 G ARI AI 1 to 4 (Alarm In) You can use external devices to signal the DVR to react to events. Mechanical or electrical switches can be wired to the AI (Alarm In) and GND (Ground) connectors. You can use external devices to signal the DVR to react to events. Mechanical switches can be used to open/close the circuit between AI and GND to trigger an event. You can also use electrical switches to apply electric voltage to an AI (0V to 3.3V) to trigger an alarm with common ground. An electric voltage of 2.4~3.3 VDC for 0.5 seconds is required to trigger an alarm on NC (Normally Closed) Alarm In. For NO (Normally Open) Alarm In, an electric voltage below 0.3 VDC for at least 0.5 seconds is required to trigger an alarm. See Chapter 3, Configuration for configuring alarm input. G (Ground) Connect the ground side of the Alarm input and/or alarm output to the G connector. 28