26
Picture 4-1.2
* Problems in practical use
User adopts a star configuration in practical connection. The termination resistors must be
connected to the two equipments which are farthest away from each other, such as equipment
1# and 15# (refer to picture 4-1.3). This connection way not accord with the requirements of
RS485 standards, it is easy to bring signal reflections, lower anti-interference performance
when the cable distance of the equipment is far away from each other. The reliability of control
signals is decreased. It cannot control the dome, or sometimes can or sometimes cannot, or
continuous operate by itself.
The factory will recommend the RS485 distributor. The distributor can transfer the star
configuration connection to the mode of connection accordance with the RS 485 standards.
The new connection achieves reliable data transmission and avoids the problem. (Refer to
picture 4-1.4)
