Figure 5-1: Ethernet Architecture
A
Engineering station
B
Primary control network
C
Secondary control network
D
Controller and I/O
E
Smart Wireless Gateway
RS485 (serial)
An RS485 connection supports Modbus RTU protocol. Using this connection type, the
Gateway is wired to an RS485 bus which typically leads to a serial I/O card or Modbus I/O
card (see Figure 5-2). Up to 31 Gateways can be connected to a single I/O card in this
manner.
Operation and Maintenance Reference Manual
September 2020 00809-0200-4410
32 Emerson.com/Rosemount
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