Figure 5-2: Fiber Optic LAN Architecture
A. Engineering station
B. Primary control network
C. Secondary control network
D. Controller and I/O
E. Fiber optic switch
F. Fiber optic
G. Copper to fiber converter
H. Gateway
RS-485 (serial)
An RS-485 connection supports Modbus RTU protocol. Using this connection type, the
Gateway is wired to an RS-485 bus which typically leads to a serial I/O card or Modbus I/O
card (see Figure 5-3). Up to 31 Gateways can be connected to a single I/O card in this
manner.
Reference Manual Operation and Maintenance
00809-0200-4420 September 2020
Emerson.com/Rosemount 45
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