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4. Terminate Network Wiring - The RS-485 wiring must be terminated at each physical
end to suppress electrical reflections and help decrease transmission errors. The X200
communications port does not include a termination resistor. Therefore, you will need
to add termination to the inverter if it is at the end of the network wiring. Select
termination resistors that match the characteristic impedance of the network cable.
The diagram below shows a network with the needed termination resistor at each
end.
5. Set Inverter OPE/485 Switch - The inverter serial port accepts a connection to either
the inverter keypad or the network. After removing the keypad, you will need to set a
DIP switch S7 on the inverter to configure the port for ModBus communications.
Setting the switch will require removing the front housing cover. Remember to power
OFF the inverter before removing the cover or changing the DIP switch S7 setting.
Refer to “Front Housing Cover” on page 2–3 for detailed instructions. Locate the
OPE/485 DIP switch as shown in the figure below. Carefully move the switch to the
upper position labeled “485” (slide in direction of arrow). Then replace the front
housing cover.
At this point the electrical network connection is complete. The next step will show how
to configure parameters and settings related to ModBus communications.
B−4
Appendix B
SP
Host device
SN
ModBus
Network
SW7
SW8
485
OPE
ON
OFF