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Reference Manual
00809-0200-4410, Rev BA
Section 5: Host Integration
February 2014
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
Figure 5-2
). Up to 31 Gateways can be connected to a single I/O card in this manner.
Figure 5-2. RS485 Architecture
5.3
Internal firewall
The Gateway supports an internal firewall that inspects both incoming and outgoing data
packets. TCP ports for communication protocols are user configurable, including user specified
port numbers and the ability to disable ports.
The Gateway’s internal firewall settings can be found by navigating to
Setup>Security>Proto-
cols
.
