13
3
Keyboard Control DVR
3.1
Connection
3.1.1 RS232 Serial Port Connection
You can use one RS232 cable to connect DVR serial port and keyboard serial port together.
DVR address number ranges from 1 to 255
，
please refer to DVR user
’s manual for more
information.
3.1.2 Via RS485 Connection
You can use one RS232 port connects to one DVR only.
You need to use RS 485 pot if you want to control several DVRs.
Connection
You can user one RS485 to RS232 switch box (provided) connect with DVR RS232 port. See
Figure 3-1.
Figure 3-1
Note
One RS485 bus can connect with thirty-two RS485-RS232 switch boxes
，
one RS485-RS232
switch box can connect with twelve DVRs.
3.1.3 Multi-keyboard link via RS485
You can use the following figure if you are connecting multiple keyboards via RS485 port. See
Figure 3-2.
