x/EN SC/Na7
-10 MiCOM P74
1.2.5 DNP3.0 communication (not available)
The DNP 3.0 protocol is defined and administered by the DNP User Group. Information
about the user group, DNP 3.0 in general and protocol specifications can be found on their
website: www.dnp.org
This protocol is not available.
1.3 Second rear communication port (SK4)
There is a hardware option of a second rear communications port, which will run the Courier
language. This can be used over one of three physical links: twisted pair K-Bus (non-polarity
sensitive), twisted pair EIA(RS)485 (connection polarity sensitive) or EIA(RS)232.
The settings for this port are located immediately below the ones for the first port as
described in previous sections of P74x/EN IT. Move down the settings until the following sub
heading is displayed.
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 status
EIA(RS)232 OK
The next cell allows for selection of the port configuration.
RP2 port config.
EIA(RS)232
The port can be configured for EIA(RS)232, EIA(RS)485 or K-Bus.
In the case of EIA(RS)232 and EIA(RS)485 the next cell selects the communication mode.
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 controls the comms. port address.
RP2 address
255
Since up to 32 relays can be connected to one K-bus spur, as indicated in Figure 2, it is
necessary for each relay to have a unique address so that messages from the master control
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 the master station to
communicate with the relay. The default value is 255 and must be changed in the range 0 to
254 before use.
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