SCADA Communications P54x/EN SC/La4
MiCOM P543, P544, P545 & P546
(SC) 13-9
SC
RP1 InactivTimer
10.00 mins.
The inactivity timer controls how long the relay will wait without receiving any messages on
the rear port before it reverts to its default state. This includes revoking any password
access that was enabled. This inactivity timer can be set between 1 and 30 minutes.
Note: Protection and disturbance recorder settings that are modified using
an on-line editor such as PAS&T must be confirmed with a write to the
‘Save changes’ cell of the ‘Configuration’ column. Off-line editors
such as MiCOM S1 Studio do not require this action for the setting
changes to take effect.
An optional fiber optic card is available in the MiCOM P54x to allow optical connection to the
Courier communication to be made over an optical connection. When fitted, it converts
between EIA(RS)485 signals and fiber optic signals and the following cell is visible in the
menu column:
RP1 Physical link
Copper
The default setting is to select the electrical (copper) connection. If the optional fiber optic
interface is fitted to the relay, then this setting can be changed to ‘Fiber optic’. This cell is
invisible if a second rear communications port or an Ethernet card is fitted, as they are
mutually exclusive and occupy the same physical location.
If the Physical link selection is copper, the next cell down becomes visible to further define
the configuration:
RP1 Port Config
KBus
The setting choice is between K-Bus and EIA(RS)485. Selecting K-Bus allows connection
with K-series devices, but means that a KITZ converter must be used to make a connection.
If the EIA(RS)485 selection is made, direct connections can be made to proprietary
equipment such as MODEMs. If the EIA(RS)485 selection is made, then two further cells
become visible to control the frame format and the communication speed :
The frame format is selected in the RP1 Comms mode setting:
RP1 Comms Mode
IEC60870 FT1.2
The standard default is the IEC 60870-FT1.2. This is an 11-bit framing. Alternatively, a
10-bit framing may be selected for use with MODEMs that do not support 11-bit framing.
The final RP1 cell controls the communication speed or baud rate:
RP1 Baud Rate
19200 bits/s
Courier communications is asynchronous and three baud rate selections are available to
allow the MiCOM P54x communication rate to be matched to that of the connected
equipment. Three baud rates are supported by the relay, ‘9600 bits/s’, ‘19200 bits/s’ and
‘38400 bits/s’.
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