29
Figure 8-3
8.3
25-pin Port and Switch Box Connection
Connect switch 25-pin box RS232 port with DVR RS232 port. (25-pin outlet supports maximum
twelve RS232 ports. Switch is just for sending not for receiving. So you can use two cables: GND
and TXD)
Please refer to the following figure if you are connecting 485 switch box to DVR See Figure 8-4.
Note
485->232 switch box does not need the TXD cable. The 1 to 8 COM port already supports this
function.
RS485 Switch Box 25-Pin Port RS232 Port
（
DB25
）
（
DB9
）
Figure 8-4
8.4
RJ45 Network Port Connection
If you are using network keyboard, you can use the network to connect.
The direct connection mode is shown as below. See Figure 8-5.
