Samsung SRD-480D User Manual page 23

Connection and setting of the serial communication port
Connecting the serial communication port for Pan/Tilt/Zoom
You can control the PTZ device via the COM port if it is compliant with the DVR.
For the compatibility, refer to "Compatible PTZ devices and keyboards". (page 24)
The figure below provides an example of connecting the PTZ-featuring camera to the RS-485 (COM2/COM3)
communication port.
For other serial ports, refer to both the figure below and the wiring diagram.
For inserting or removing the wire, refer to "How to handle the wiring cables". (page 20)
Wiring diagram for serial communications
Wiring diagram for COM1 (RS-232)
Wiring diagram for COM2/COM3 (RS-485)
AC 10
0-2 40
~IN
COM1
CD
1
RXD
2
TXD
3
DTR
4
GND
5
DSR
6
RTS
7
CTS
8
RI
9
COM2/COM3
+
-
+
-
GND
Text
Text
Transparent
Keyboard
Keyboard
Tx
Rx
GND
Transparent
Keyboard
+/-
PTZ
+
-
+
-
English _23