P54x/EN SC/La4 SCADA Communications
(SC) 13-10
MiCOM P543, P544, P545 & P546
SC
1.3.3 Configuring the second rear courier port, RP2 (where fitted)
For relays having the second rear (Courier) communications port fitted, the settings are
located immediately below the ones for the first port described above. The second rear
communications port only supports the Courier protocol and the settings are similar to those
for Courier RP1. The first cell displays:
Rear Port 2 (RP2)
The next cell defines the protocol, which is fixed at Courier for RP2.
RP2 protocol
Courier
The following cell indicates the status of the hardware, e.g.
RP2 card status
EIA(RS)232 OK
The following 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.
As in the case of the first rear Courier port, if K-Bus is not selected certain other cells to
control the communication mode and speed become visible. If either EIA(RS)232 or
EIA(RS)485 is selected for the port configuration, the next cell is visible and selects the
communication mode.
RP2 comms. mode
IEC60870 FT1.2
The standard default is the IEC 60870 FT1.2 for normal operation with 11-bit modems.
Alternatively, a 10-bit framing with no parity bit can be selected for special cases.
The next cell down sets the communications port address.
RP2 address
255
Since up to 32 devices can be connected to one K-bus spur, as indicated in Figure 2, it is
necessary for each device to have a unique address so that messages from the master
control station are accepted by one device only. Courier uses an integer number between 0
and 254 for the device address that is set with this cell. It is important that no two devices
have the same Courier address. The Courier address is then used by the master station to
communicate with the device. The default value is 255 and must be changed to a value in
the range 0 to 254 before use.
The following cell controls the inactivity timer.
RP2 InactivTimer
15 mins.
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