Emerson Wireless 1420 Gateway Reference Manual page 45

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Reference Manual

00809-0200-4420

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

manner.

Emerson.com/Rosemount

Figure

5-3). Up to 31 Gateways can be connected to a single I/O card in this

Operation and Maintenance

September 2020

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