Parameter List; Parameter List For Optical And Rs485 Communication Channel - Hitachi Relion 670 Series Communication Protocol Manual

1MRK511391-UUS Rev. L
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 fixed time and a random time where the maximum random time is also configurable. The
back-off feature is always on.
tMaxRndDelBkOf specifies the configurable RS485 maximum back-off random time delay in seconds.
HWCollisionDetect, a new collision detect feature in hardware is implemented to improve the sensitivity
for collision detection. The performance of this feature depends on parameters of the RS485 network as
well as the protocol behaviour. It can even have negative impact on performance in some circumstances,
therefore usage of the feature should be tested and adapted for each specific installation.
Master session settings for RS485 communication channel, MSTSERIAL
ChToAssociate defines the channel, to which this master session should be associated to.
4.2

Parameter list

4.2.1

Parameter list for optical and RS485 communication channel

Table 4: RS485GEN Non group settings (basic)
Name Values (Range)
WireMode Four-wire
Two-wire
DNP, 670 series
Communication protocol manual
HWCollisionDetect is only used for RS485 networks, thus is only available in RS485DNP
function.
The MSTSERIAL function includes the same settings as the MS1TCP to MS4TCP functions,
except the ChToAssociate setting which is used to select either the serial optical or RS485
communication interface on hardware modules.
Unit Step
- -
© 2017 - 2023 Hitachi Energy. All rights reserved
Default Description
Four-wire Two or four wire mode
Section 4
DNP3 parameters
PID-4060-SETTINGS v5
27