Unitek DVR-404, User Manual, Page: 26 / 127

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4 & 8 & 16 Channel DVR Operation manual Revision 1.0
1.5.1.3 Audio
4 channel Audio Input of RCA standard terminal is basic. 8 &
16channel Audio input is an option and it supports through separate
“EXTENSION PORT”.
1.5.1.4 RS-232
Using RS-232 protocol, connects to serial port of PC to control
DVR system or to set up system more easily , connecting with
PC, which is installed Quick Installer. You can refer to left picture
for connection and use Cross cable for connection.
1.5.1.5 RS-485
It supports 2EA port, which supports RS-485 standard. It is
available to control internal PTZ, external KEYBOARD connection
and other various purpose. Also it is more easy to connect, as it is
provided with Terminal Block type, which is available to be connected
directly.