Samsung SPD-1000 - Manual (Page 11)

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In order to prevent signal reduction, the termination resistance of the 2 end units,
which are the distant paths for camera and controller to be connected on the RS485
interface, should be connected. As the termination resistance is built in the camera,
whether to make the termination resistance valid or invalid is selected with the DIP
switch. See the connection diagram below for determining to which device the
termination resistance will be connected to. Set up the termination resistance in the
dark products. The installation distance of the product for the termination resistance
setting should be less than 1.2 Km. (Maximum cable length is 1.2 Km according to the
RS-485 standards.)
Part Names and Functions
Setting Termination Resistance
Camera ID
250
251
252
253
254
255
Pin Order Pin Name Purpose
1 D+ RS-485 Data+
2 D- RS-485 Data-
3 G GND
4 S1 Alarm Signal Input Port #1
5 S2 Alarm Signal Input Port #2
6 G GND
7 +V +12V Output Port
8 NO Alarm Signal Output Port #1 (For Normal Open)
9 NC Alarm Signal Output Por #1 (For Normal Close)
10 CM Alarm Signal Output (For Common)
Connect the controller and alarm input and output signal (main body port block)
SW1-#8
OFF
ON
OFF
ON
OFF
ON
SW1-#7
ON
ON
OFF
OFF
ON
ON
SW1-#6
OFF
OFF
ON
ON
ON
ON
SW1-#5
ON
ON
ON
ON
ON
ON
SW1-#4
ON
ON
ON
ON
ON
ON
SW1-#3
ON
ON
ON
ON
ON
ON
SW1-#1
ON
ON
ON
ON
ON
ON
SW1-#2
ON
ON
ON
ON
ON
ON Auxiliary Video Out Port
When the product is installed in a place where video signal connection through the BNC
port is unavailable, you can connect a video cable using the Auxiliary Video Out Port. In
this case, connect using the BNC auxiliary cable that is supplied as an accessory.