TECO A510s - RS485 -Network (Modbus); Appendix A: Communication Networks

A1-1
Appendix A: Communication Networks
A1.1 RS485 –Network (Modbus)
This section shows a RS485 network consisting of several inverters communicating using the
built-in Modbus RTU protocol.
S-
Inverter #1
S+
S-
Inverter #2
S+
S-
Inverter #n
S+
PC / PLC
RS485
Resistor
120 Ohm
RS232/
RS485
Resistor
120 Ohm
+
-
+
-
E E E
RX
TX
GND
PC / PLC
RS232
SW4
Wiring diagram RS485 Modbus RTU Network
Notes:
- A PC / PLC controller with a built-in RS-485 interface can be connected directly to the RS-485
network. Use a RS232 to RS485 converter to connect a PC / PLC with a built-in RS-232 interface.
- A maximum of 31 inverters can be connected to the network. Terminating resistors of 120 ohm must
be installed at both end of the network.
Refer to A510s RS-485 Modbus communication manual for more information.