25
7
Make COM Cable
The keyboard standard accessories bag includes the following items:
One DB9
Seven DB9
One six-pin crystal port
One 25-pin (DB25)
One 485 switch box. (Including one power sourcing.)
7.1
Make RS232 COM Cable
Please refer to the following figure for RS232 port information. See Figure 7-1.
RS232 Serial Port RS232 Serial Port
（
DB9
）
（
DB9
）
Figure 7-1
7.2
Make RS485 COM Cable
You can refer to Figure 7-2 if you are connecting the keyboard with the switcher box.
RS485 Port of Keyboard RS485 Switch Box Port
（
Green alarm socket
）
（
6-pin crystal
）
Figure 7-2
7.3
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 sheet if you are connecting 485 switch box to DVR See Figure 7-3.
