Alstom MiCOM P846, Technical Manual

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P846/EN SC/D SCADA Communications
(SC) 13-8
MiCOM P846
SC
REAR PORT2 (RP2)
The next cell down indicates the language, which is fixed at Courier for RP2.
RP2 protocol
Courier
The next cell down indicates the status of the hardware, e.g.
RP2 card statu
EIA(RS)232 OK
s
The next cell allows for selection of the port configuration.
RP2 port config.
EIA(RS)232
The port can be configu S)232, EIA(RS)485 or K-Bus.
In the case of EIA(RS)2 S)485 the next cell selects the communication mode.
red for EIA(R
32 and EIA(R
RP2 comms. mode
IEC60870 FT1.2
The choice is either IEC60870 FT1.2 for normal operation with 11-bit modems, or 10-bit no
parity.
The next cell down con rt address.
RP2 address
trols the comms. po
255
Since up to 32 relays c
necessary for each rela an be connected to one K-bus spur, as indicated in Figure 2, it is
y to have a unique address so that messages from the master control
e master station to
communicate with the relay. The default value is 255 and must be changed in the range 0 to
The next cell down controls the inactivity timer.
er
15 mins.
station are accepted by one relay only. Courier uses an integer number between 0 and 254
for the relay address that is set with this cell. It is important that no two relays have the
same Courier address. The Courier address is then used by th
254 before use.
RP2 inactivity tim
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, including revoking any password access
that was enabled. For the rear port this can be set between 1 and 30 minutes.
In the case of EIA(RS)232 and EIA(RS)485 the next cell down controls the baud rate. For
K-Bus the baud rate is fixed at 64kbit/second between the relay and the KITZ interface at the
end of the relay spur.