Moxa Technologies 6110 - Manual (Page 24)

3-2
Ethernet master devices talk to multiple
serial slave devices
Connect all Modbus devices over the Ethernet network…
Most host computers and newly developed PLCs support the Ethernet interface
and run Modbus/TCP. NPort 6110 Modbus Gateway is needed to link discrete
Serial Modbus Devices for data collection and control.
Each NPort 6110 supports Modbus/TCP over Ethernet, which allows up to 7
connections. The software configurable serial interface supports either RS-232 or
RS-422/485. In RS-232/422 modes, NPort 6110 can be connected to 1 serial
device. Under RS-485 mode, NPort 6110 supports up to 31 serial devices, which
is the most popular application for factory floor applications.
Host
Computer
NPort 6110 NPort 6110
RS-485
RS-232
PLC
Modbus/TCP
Master devices
Modbus/RTU
Modbus/ASCII
Slave devices
Ethernet
Flow meters
Drives
Loop controller
Power measurement
(up to 31 devices)