Alstom MiCOM P546 - 1.9.1 Front courier port

P54x/EN GS/La4 Getting Started
(GS) 3-16 MiCOM P543, P544, P545 & P546
Figure 7 PC - relay signal connection
Having made the physical connection from the relay to the PC, the PC’s communication
settings must be configured to match those of the relay. The relay’s communication settings
for the front port are fixed as shown in the table below:
GS
Protocol
Cou
rier
Baud rate
19,200 bits/s
Courier address
1
Message format
11 bit - 1 start bit, 8 data bits, 1 parity bit (even parity), 1 stop bit
The inactivity timer for the front port is set at 15 minutes. This controls how long the relay
will maintain its level of password access on the front port. If no messages are received on
the front port for 15 minutes then any password access level that has been enabled will be
revoked.
1.9.1 Front courier port
The front EIA(RS)2
32
1
9 pin port supports the Courier protocol for one to one
communication. It is designed for use during installation and commissioning/maintenance
and is not suitable for permanent connection. Since this interface will not be used to link the
relay to a substation communication system, some of the features of Courier are not
implemented. These are as follows:
Automatic Extraction of Event Records:
 Courier Status byte does not support the Event flag
 Send Event/Accept Event commands are not implemented
Automatic Extraction of Disturbance Records:
 Courier Status byte does not support the Disturbance flag
Busy Response Layer:
 Courier Status byte does not support the Busy flag, the only response to a request will
be the final data
Fixed Address:
 The address of the front courier port is always 1, the Change Device address command
is not supported.
Fixed Baud Rate:
 19200 bps
Note: Although automatic extraction of event and disturbance records is not
supported it is possible to manually access this data via the front port.
1
This port is actually compliant to EIA(RS)574; the 9-pin version of EIA(RS)232, see www.tiaonline.org.