17
Fig. 9
¾
T+, T- are senders of RS485, connect to Rx+ and Rx- of PTZ or dome. Details refer to “Section 5
PTZ (pan, tilt and zoom) control connection”.
Note: RS485
（
2
）
is set for PTZ control.
¾
R+, R- are receivers of RS485, connect to keyboard. This DVR can only use 485(1) port for keyboard.
Remark 2 RS485 matched resistance
Open the cover, there is a 2*4 pin header (SW1) between Network port and RS485 port. They can control 120
Ω
resistance for RS485(2).
Pin Function
1 N/A
2
Control 120
Ω
resistance for RS485(2)
3
4 N/A
