5 Inch Network High-definition Speed Dome User Manual
48
Figure 3
4. Problems in the Practical Application
Normally, users adopt star-shape connection method in construction, under this situation, the terminal resistors must be connected
between two farthest devices (as Figure 4, 1# and 15#), but this connection method is not satisfy the requirement of the RS485
industry standard so that it will lead to some problems such as signal reflection, anti-jamming ability decline when the devices are
faraway. At this time, the dome will be uncontrollable, or self-running, etc.
Figure 4
For such case, the best way is adding a RS485 distributor. This product can effectively change the star-shape connection to which
satisfies the requirement of RS485 industry standard, in order to avoid those problems and improve the communication reliability.
Show as figure 5.
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