Connecting To The Rs485 Port; Figure 2-7 Rs485 Port Connections - Honeywell HRSD40F User Manual

Installation
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
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.
Connect RX-/ TX- and RX+/TX+ of the control system to the - and + (respectively) of
the DVR. See
manufacture's manual for configuring the RS485 connection.
Document 800-03097 Rev C
03/09
Note All the connectors marked G are common.
Figure 2-7 RS485 Port Connections
R S 4 8 5
_
+
Chapter 3, Configuration
Chapter 3, Configuration
and the PTZ camera or remote controller
for configuring alarm
29