IC Realtime Professional 3-D DVR/PTZ Keyboard with Network Capability - Manual (Page 11)

11
Figure 2-2
① RJ45 network port ② RS485 port ③ RS232 port ④ Power socket
2.4 Port Features
RS232 can directly connect with DVR. The distance should be within 10m.
One RS232 port could only connect with one DVR. You must use 485-> 232 converters to
connect more DVRs.
RS-485 transmission distance is 1200 m（9600bps），max 3000 m.
In level-link mode, one RS-485 port can connect with as many as 16 keyboards.
You can connect RJ45 with DVR and realize front device multiplex control via the network
keyboard.
2.5 Power
The keyboard uses +12V DC, you can use +12V adapter included in the accessories package.
See Figure 2-3.
Figure 2-3