1.2a Serial connections Capabilities Current value If configurable, list
methods
● None None PST of LHMI
(tRxToTxMinDel)
○RS-485 options:
● Requires Rx inactive before Tx
○ Other, explain:
1.2.5 Interval to request link status. Indicates how often to send Data Link Layer status requests on a serial connection. This parameter is
separate from the TCP Keep-alive timer.
● Not Supported Not supported
○ Fixed at _____ seconds
○ Configurable, range ___ to ___ seconds
○ Configurable, selectable from ___,___,___ seconds
○ Configurable, other, describe:
1.2.6 Supports DNP3 collision avoidance: Indicates whether an Outstation uses a collision avoidance algorithm. Collision avoidance may be
implemented by a back-off timer with two parameters that define the back-off time range or by some other vendor-specific mechanism. The
recommended back-off time is specified as being a fixed minimum delay plus a random delay, where the random delay has a maximum value
specified. This defines a range of delay times that are randomly distributed between the minimum value and the minimum plus the maximum
of the random value. If a back-off timer is implemented with only a fixed or only a random value, select the Back-off time method and set the
parameter that is not supported to “Fixed at 0 ms”.
○ No Yes PST or LHMI
(tBackOffDelay and
tMaxRndDelBkOf)
● Yes, using Back-off time = (Min + Random) method
Minimum Back-off time:
○ Fixed at_________
ms
● Configurable, range 0 to 60000 ms
○ Configurable, selectable from __,__,__ ms
○ Configurable, other, describe:
Maximum Random Back-off time component:
○ Fixed at_________
ms
● Configurable, range 0 to 60000 ms
○ Configurable, selectable from __,__,__ ms
○ Configurable, other, describe:
○ Other, explain ________________________
1.2.7 Receiver Inter-character time-out: When serial interfaces with asynchronous character framing are used, this parameter indicates if the
receiver makes a check for gaps between characters, that is, extensions of the stop bit time of one character prior to the start bit of the
following character within a message). If the receiver performs this check and the time-out is exceeded, then the receiver discards the current
data link frame. A receiver that does not discard data link frames on the basis of inter-character gaps is considered not to perform this check.
Where no asynchronous serial interface is fitted this parameter is not applicable. In this case, none of the options shall be selected.
Table continues on next page
Section 3 1MRK 511 419-UUS A
DNP3 protocol implementation
30 650 series 2.2 ANSI
Point list manual
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