Motorola 68P02958C00-B - Manual (Page 126)

Network Configuration
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In case of an unreachable server (due to some communication problem), communication
overhead will be higher as this parameter is lower (more frequent request transmissions). On
the other hand, a client may be left with an invalid clock for at least the period of time defined
in this parameter, if the server is unreachable.
TX After Restart Retry Interval (Seconds) <0-255> [20]
This parameter defines the interval between two consecutive retries to transmit an “After
Restart” message to the entire network (on the authenticated Links only). This parameter is
relevant only to Server and Client/Server operation modes. Note that the number of retries is
not set since a Server will try endlessly to transmit an After Restart message until it succeeds.
Max Drift (seconds) <10-3600> [300]
This parameter defines the maximum drift allowed between the timestamp contained in an
authenticated received frame and the local clock or the receiving RTU. Hence this parameter
defines the maximum drift between any two CPUs’ clocks. If Max Drift is set to x, then for a
given time t0 (local receiver clock), a received frame must carry a timestamp in the range of t0
+/- x in order that it NOT be discarded. Recall that a received timestamp is added to the value
of Maximum Network Delay and only then it is checked against the local receiver clock. The
authentication mechanism of a received frame is stricter as Max Drift is set lower.
Note that the maximum drift may actually be smaller than the Max Drift parameter, because
the incoming timestamp is compared to an internal generated timestamp and not to an actual
clock. The internal timestamp is generated every TX Stamp Interval. Consider a situation
where the Max Drift is set to 300 seconds and the TX Stamp Interval is set to 150 seconds. An
RTU whose clock has drifted by 200 seconds may reject the received frame as invalid if its
internal timestamp was generated 140 seconds previously.
Max Network Delay (Msec) <0-3600000> [0]
This parameter defines the maximum of all delays of the authenticated links in the network. It
is relevant to received frames only. If a frame carrying a timestamp with a value of t1 is
received, the receiving RTU will add the value of Maximum Network Delay to t1 for the
purpose of authenticating the frame. In most cases, this parameter should be set to zero.
Once the parameters have been set, click OK.
Edit Links Costs
This command is for future use.
Tools Menu
View As Text
The View As Text command (Network Configuration, Tools menu) opens the network
configuration parameter values in textual form, as shown below. All standard Windows text
file operations are available.