Honeywell HRSD40F250 User Guide - Page 29
Connecting to the RS485 Port, NC/NO Relay Alarm Output, ARI Alarm Reset - international
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Installation Note All the connectors marked G are common. NC/NO (Relay Alarm Output) The DVR can activate external devices such as buzzers or lights. Connect the device to the C (Common) and NC (Normally Closed) or C and NO (Normally Open) connectors. NC/NO is a relay output which is specified to a maximum of 2A@125VAC and 1A@30VDC. See Chapter 3, Configuration for configuring alarm output. ARI (Alarm Reset In) An external signal to the Alarm Reset In can be used to reset both the Alarm Out signal and the internal buzzer of the DVR. Mechanical or electrical switches can be wired to the ARI (Alarm Reset In) and G (Ground) connectors. The threshold voltage is below 0.3V and should be stable at least 0.5 seconds to be detected. Connect the wires to the ARI (Alarm Reset In) and G (Ground) connectors. Connecting to the RS485 Port The DVR can be controlled remotely by an external device or control system, such as a control keyboard, using RS485 half-duplex serial communications signals. You can also use the RS485 connector to control PTZ (pan, tilt, zoom) cameras. Figure 2-7 RS485 Port Connections R S485 _+ Connect RX-/ TX- and RX+/TX+ of the control system to the - and + (respectively) of the DVR. See Chapter 3, Configuration and the PTZ camera or remote controller manufacture's manual for configuring the RS485 connection. Document 800-03097 Rev C 29 03/09