CPS SCH275KTL-DO/US-800, Руководство пользователя, Страница: 30 / 79

Electrical Connection
30 / 79
4.6.2
Communication Cable Connection
Cable Connection Methods
Choose the RS485 communication cables according to the following figures:
Figure 4-12 RS485 communication cable connection
It is recommended that industrial grade RS485 cable be used in lieu of unshielded
twisted pair. Communication cable such as (CAT5) or Belden 3106A cable for
RS485 5-pin connector is preferred.
RS485 Network Connection
When the inverters are monitored via the RS485 communication, a unique RS485
address for each inverter can be set up through the APP interface. Up to 32
inverters can be connected in a serial fashion in the RS485 communication
network. Therefore, the daisy-chain topology (see Figure 5-4) is recommended
for the RS485 network connection, which can minimize the noise and bus
reflections. Other communication topologies, such as the star networks, are not
recommended.
Figure 4-13 RS485 Network Connection
If there are multiple inverters in the RS485 network, the selector switch S201 of
the last inverter in the daisy-chain should be in ON position, to enable the 120ohm
terminal resistor. The selector switch S201 of all other inverters should be in the
OFF position to disable the terminal resistor.