Evolveo DETECTIVE S4CIH7D, Руководство пользователя, Страница: 8 / 76

- 88 -
3. Use fitment materials that absorb the sound to reduce reflection of the
sound.
4. Adjust the layout of the sound box and the tone arm.
2.7 PTZ connections
1. PTZ decoder connections
A. The grounding of the PTZ decoder and DVR must be shared otherwise the
common-mode voltage will lead to the PTZ control failure. The shielded
twisted pair is recommended.
B. Avoid the entrance of high voltage. Make the layout reasonably. Take
precaution from the thunder.
C. In the outlying end connect 120Ω resistance paralleled to reduce the
inflection and insure the signal quality.
D. The 485 +/- lines of DVR cannot connected with other 485 output
equipments paralleled.
E. The voltage between the +/- lines of the decoder must be less than 5V.
2. Front equipment grounding note
Incorrect grounding can result in damage to the unit.
3. PTZ input type unlimited
Parameter Meaning
485T+/A, 485T-/B
485communication interface which is connected with the recording
control equipments such as the decoder