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Reference Manual
00809-0200-4410, Rev BC
Host Integration
July 2017
Host Integration
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 <HotXRef>Figure 5-2).
Up to 31 Gateways can be connected to a single I/O card in this manner.
Figure 5-2. RS485 Architecture
A. Engineering station
B. Primary control network
C. Secondary control network
D. Controller and I/O
E. Serial I/O card
F. RS485 bus
G. Wireless Gateway
A
BC
D
G
E
F
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