-
FIGURE 10: 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:
Protocol Courier
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)232
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
It should be noted that although automatic extraction of event and disturbance records is not
supported it is possible to manually access this data via the front port.
1.10 S1 Agile relay communications basics
The EIA(RS)232 front communication port is intended for use with the relay settings program
S1 Agile. This program runs on WindowsTM 2000, XP, Vista or Windows 7 and is the
universal IED Support Software used for direct access to all stored data in any IED.
S1 provides full access to:
− Px40, Modulex series, K series, L series relays
− Mx20 measurement units
Connecting to the P74x relay using S1 Agile
1
This port is actually compliant to EIA(RS)574; the 9-pin version of EIA(RS)232, see www.tiaonline.org.
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