EnCal 3000 Hardware Manual 73022344 o 100
9.1.3 Prevent unauthorized external access using a firewall.
To reduce the risk for your network, we recommend that you use a firewall or another
mechanism to restrict network traffic between the “external” central billing or control
system and the “internal” network of the gas metering systems. We also recommend
that you only allow protocols and ports which are actually used for data exchange with
the external network and that these are added, for example, to the firewall’s white list.
See the following data protocols with their TCP standard ports (Ethernet) and the
explanatory illustration.
Protocol
ProtocolProtocol
Protocol
Standard
Standard Standard
Standard
port
portport
port
Description
DescriptionDescription
Description
HTTP 80 Hypertext Transfer Protocol allows, for example, access to an
enCore device via the remote operation panel.
MMS 102 Manufacturing Messaging Specification (pursuant to ISO
standard 9506) allows communication between enSuite and
enCore devices.
Modbus
TCP
502 Protocol for data exchange by user-defined registers between
AMR and enCore devices using a standard TCP/IP network.
NTP 123 Network Time Protocol for the high-precision time
synchronization of enCore devices with an NTP time server.
Example of a router and firewall between the metering system and control room and
data exchange via Modbus TCP in a trustworthy network
Figure 9.1: Example of a router and firewall
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