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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.
