6-8 Settings Date Code 20010518
SEL-2020 Instruction Manual
Table 6.4: SET P Port Communications Settings Information (continued)
Setting Comment
SO_TIMEOUT
Prompt. Select/Operate time-out interval, seconds (0.0-30).
Description. Enter the maximum allowable time between DNP function codes for Select
and Operate. If an Operate command follows the Select command by more than this time-
out, the operation will not occur. Set based on worst-case timing of your master. (See
Appendix I: Distributed Network Protocol (DNP) V3.00 for an explanation of the DNP
protocol.)
DL_CONFIRM
Prompt. Number of data-link retries (0 for no confirmation, 1-15).
Description. Set to 0 to disable DNP data-link confirmation. Otherwise, set to the number
of retries you want the DNP data-link to use. (See Appendix I: Distributed Network
Protocol (DNP) V3.00 for an explanation of the DNP protocol.)
DL_TIMEOUT
Prompt. Data Link Time-out (0-5000 milliseconds).
Description. Set to the worst-case DNP data-link acknowledge time of your master.
When using DNP data-link confirmation, this is the time the SEL-2020 will wait before
assuming there is no confirmation and resending the message. (See Appendix I:
Distributed Network Protocol (DNP) V3.00 for an explanation of the DNP protocol.)
MIN_DELAY
Prompt. Minimum Delay from DCD to transmission (0-1000 msec).
Description. This is the minimum delay the SEL-2020 will wait from DCD going away or
from the last character being received before initiating data transmission. (Appendix I:
Distributed Network Protocol (DNP) V3.00 for an explanation of the DNP protocol.)
MAX_DELAY
Prompt. Maximum Delay from DCD to transmission (0-1000 msec).
Description. This is the maximum delay the SEL-2020 will wait from DCD going away or
from the last character being received before initiating data transmission, if there is a
transmission pending. Set this to something bigger than MIN_DELAY to cause some
randomness in the time at which it attempts to transmit again. In a system with unsolicited
messaging, this will help reduce the likelihood of repeated collisions. (Appendix I:
Distributed Network Protocol (DNP) V3.00 for an explanation of the DNP protocol.)
REPORT_ON
Prompt. Percent of Full-Scale Change to Report on (0-100%).
Description. This setting determines at what point counter and analog input events are
declared. Set this to the percent of the full-scale that you want events reported on. (See
Appendix I: Distributed Network Protocol (DNP) V3.00 for an explanation of the DNP
protocol.)
UNSOL_REP
Prompt. Allow Unsolicited Reporting (Y/N).
Description. Set to Yes to enable unsolicted DNP event reporting or No to disable such
reporting. (Appendix I: Distributed Network Protocol (DNP) V3.00 for an explanation of
the DNP protocol.)
UNSOL_POW
Prompt. Enable unsolicited messages on power-up (Y/N).
Description. Set based on whether or not you want DNP unsolicited reporting enabled on
power-up. If your master supports the unsolicted message enable function code, set this to
No and let your master enable it to reduce bus contention on power-up. Otherwise, set it to
Yes. (See Appendix I: Distributed Network Protocol (DNP) V3.00 for an explanation of
the DNP protocol.)
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