Simplex RS-485
A simplex RS-485 host connection supports Modbus RTU protocol. When using this
architecture, connect the secondary Ethernet port on Gateway A directly to the secondary
Ethernet port on Gateway B. Then wire the RS-485 ports for both Gateways in parallel to a
single serial card at the host system. See Figure D-5, Simplex RS-485 Architecture.
Figure B-6: Simplex RS-485 Architecture
A. Engineering station
B.
Process control network
C. Controller and I/O
D. Serial card
E. RS-485 bus
F. Secondary Ethernet
Note
In either a simplex or dual RS-485 architecture, the primary Ethernet ports can be
connected to an asset management network to provide connectivity to AMS Device
Manager or AMS Wireless Configurator.
Dual RS-485
A Dual RS-485 host connection support Modbus RTU protocol. When using this
architecture, connect the secondary Ethernet port on Gateway A directly to the secondary
Ethernet port on Gateway B. Then wire the RS-485 ports for both Gateways separately to
dual serial cards at the host system. See Figure D-6, Dual RS-485 Architecture.
Redundant Gateway systems Reference Manual
May 2020 00809-0600-4410
60 Emerson.com
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