Micom P721, Technical Manual

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User Guide P72x/EN FT/C21
MiCOM P721/P723 Page 21/38
2.6 COMMUNICATION Menu
The COMMUNICATION menu content depends on the communication protocol of the relay.
Three protocols are available: MODBUS, IEC 60870-5-103 and DNP3.0.
To access the MEASUREMENTS menu from the default display, press then until the
menu is reached.
WARNING: A MODBUS NETWORK IS LIMITED TO 31 RELAY + 1 RELAY MASTER
ADDRESSES ON THE SAME MODBUS SUB-LAN.
COMMUNICATION
Heading of the COMMUNICATION menu.
Communication ?
Yes
Activates IEC 60870-5-103 communication via the
RS485 port on the rear terminals of the relay.
Rear Comm.
Address 1
This cell sets the unique address for the rear
communication port such that only one relay is accessed
by master station software.
Select from 1 to 255.
Baud Rate
9600
bd
This cell controls the communication speed between
relay and master station.
It is important that both relay and master station are set
at the same speed setting.
Select from: 300, 600, 1200, 2400, 4800, 9600, 19200 or
38400 bd.
Parity
None
Choose the parity in the IEC data frame.
Select parity: “Even”, “Odd” or “None”.
Data Bits
8
Choose the number of data bits in the IEC data frame.
Select stop bit: 8 or 7.
Stop Bits
1
Choose the number of stop bits in the IEC data frame.
Select stop bit: 0 or 1.
Spont. Event
Enabl.
All
IEC 60870-5-103 communication only
The events created by the relay have two formats (see
P72x/EN CT chapter):
- public range, using IEC protocol,
- private range, using private number format.
This command activates or deactivates private and
public format transmission of the events to the master
station
Possible choice: Enabl. All – Enabl. IEC. only – Enabl.
none
Command Blocking
No
IEC 60870-5-103 communication only
Allows or blocks remote commands.
Setting choice: Yes – No
Signal Blocking
No
IEC 60870-5-103 communication only
Activates or deactivates signal transmission from relay to
the master station.
Setting choice: Yes – No