Motorola 68P02958C00-B - Manual (Page 193)

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Communication Setup
This utility is designed to set the parameters to be used by the communication driver.
If you want to change the communication setup, close all Toolbox tools, stop the
communication driver using the Stop Communication Driver tool, and then make the
modifications you want.
The Ethernet port checkbox enables communication between an IP Gateway Toolbox and
an IP Gateway unit over a TCP/IP interface. Once you are connected to the IP gateway via
the TCP/IP interface, the Toolbox can access all the RTUs in the system connected to the
IP Gateway using ‘Remote Site ID’ (The Link IDs must be properly defined in order to use
this feature.)
The ‘Protect Third Party Protocol over MDLC port’ checkbox is relevant only when a
Toolbox MDLC port is also used for some Third Party protocol. If this Third Party
protocol is not sophisticated enough to ignore messages from other protocols sharing the
port, the Communication Setup utility allows you to block all messages not intended for
that protocol for the length of the session.
Before each MDLC session, MDLC sends a ‘start protection’ message, after which the
remote prevents MDLC messages from being sent to Third Party protocol. At the end of
the session, an ‘end protection’ is sent which opens the port to all MDLC messages. If
communication fails and the ‘end protection’ transmission is lost, protection will end after
a few minutes, as determined by an internal timer.
Third Party protocol protection adds overhead of approximately 20 bytes/session (start/end
protection bytes) and therefore should not be selected if the port is only used for MDLC.
Mature protocols such as MDLC and DNP do not require this protection and can recognize
and reject messages which are irrelevant to them.