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Section 4
DNP3 parameters
32
frames, set to the following based on the desired operation for a specific
communication session:
•
Never - not for any frame
•
Sometimes - only for multiframe message fragments
•
Always - for all frames
tDLinkTimeout specifies the maximum amount of time to wait for a link level confirm
if requested (that is, if DLinkConfirm is Enabled). Even if DLinkConfirm is set to
Never, this will be used for linktest frame and request link status if they are sent.
DLinkRetries is the maximum number of link layer retries if data-link layer confirms
time up.
tRxToTxMinDel is the minimum time (in seconds) after receiving a character, before
another attempt to transmit a character on this channel. This is generally useful when
using a modem or some other communication device that requires a minimum time
between receive and transmit.
ApLayMaxRxSize specifies the maximum application fragment size received in octets.
ApLayMaxTxSize specifies the maximum application fragment size transmitted in
octets.
Stopbit defines the number of stop bits for the serial port.
Parity defines the parity to use for the serial port it can be set to:
•
None - no parity used
•
Even - even parity used
•
Odd - odd parity used
tRTSWarmUp configures transmitter warm-up and warm-down delay times (in
milliseconds). If warm-up is configured to non-zero then at start of the send, the
transmitter is Enabled. This means that the line is driven but the data send of the start
is delayed by the warm-up delay time.
tRTSWarmDown specifies that if warm-down is configured to non zero then at end of
the send, the transmitter deactivation is delayed by the warm-down time.
tBackOffDelay specifies that if the data send is started, a check is made if data is being
received at that time. If yes, a back-off timer is started and when it times out, a check is
made again to see if line is idle. If no, a new back-off timer is started. This is repeated
until the line is idle and send can start. Line idle is determined when nothing is
received for more than a character time. The back-off time consists of a configurable
1MRK 511 391-UUS A
670 series 2.2 ANSI
Communication protocol manual
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