Moxa Technologies NPort 6110 - Manual (Page 19)

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3.
Typical Modbus Applications
In this chapter, we introduce three typical Modbus applications.
Serial master device talks to serial slave
devices over the Internet
Let traditional Modbus serial devices talk over the Internet…
Many traditional serial Modbus devices can talk over RS-485, but the RS-485
network limits the maximum number of Modbus devices to 32, provided the
transmission distance does not exceed 1.2 km.
By using Modbus Gateway, you can link all Serial Modbus devices over an
Ethernet network. Up to 4 Modbus Gateways can be installed in the same control
network, extending the coverage of a single Modbus network as far as a TCP/IP
network can reach.
NPort 6110
NPort 6110 NPort 6110 NPort 6110
RS-485 RS-485
RS-232
RS-232
Modbus/RTU
Master device
Modbus/RTU
Slave devices
Ethernet
Flow meter
Drives Loop controller
Power measurement PLC
DCS