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Add:5/F,Tonggao Building A,Sanlian Industry Park,Shiyan,Baoan,Shenzhen,

China
Tel:0755-29993165
Fax:0755-29993375
EMail:sales@secu365.cn
Service:0755-29993167


> The keyboard can not control the DVR
Possible reasons are as followed:
1. The serial port of the DVR is not set correctly.
2 .The address is not correct.
3. When multiple transformers are connected, the power supply is not large enough. Please give each
transformer individual power supply.
4 .The distance is too far.