Approach Tech DVR-3024M - Manual (Page 9)

7
SD Card
RS-232
ALARM DC12V
RS-485
hi-z
75
AUDIO
IN
IN
OUT
OUT
MONITOR
ETHERNET
I/O
25
31 32 33
27 26 28
29 30 34 35 36 37
1.3.2 Rear View
25 VIDEO IN Connector: These 4 BNC
connectors are used to connect the video
output from a camera
26 Hi-Z/75 Ω Individual termination: These 4
switches are used to set the impedance of
each loop between 75Ω and Hi-Z.
27 SD CARD Slot: This is used for system
software updating and archiving/accessing
critical images.
28 RS-232 Port: The RS-232 communication
port functions as a connector to an external
control device.
29 MONITOR Connector: The connector links
the unit’s composite video to a display device.
30 AUDIO OUT: This connector is used to link
the device’s audio input.
31 AUDIO IN Connector: This connector is used
to connect the audio output from a camera or
other devices to the DVR.
32 ETHERNET 10/100 Connector: This is one
standard RJ-45 connector for 10/100 Mbps
Ethernet networks.
33 RS-485 Port: The RS-485 communication
ports function as connectors when two or
more units are serially connected to an
external control device.
34 ALARM I/O: This is a 9-PIN D-SUB
connector including SWITCH OUT, GROUND,
ALARM OUT, DISK FULL, RECORD IN,
ALARM RESET, and ALARM IN for
connecting with external devices. Please refer
to the next section for details.
35 Wire Catch: The wire catch secures the
power cord and keeps it in place (so that it
does not droop or hang loosely).
36 Ground Screw: The ground screw is for the
chassis terminal.
37 Plug Inlet: The inlet connects to an external
power supply. Connect 12 V DC UL Listed
Class 2 Power Supply.