GE D30 Instruction Manual page 169

CHAPTER 5: SETTINGS
The serial communication ports utilize the Modbus protocol, unless the port is configured for DNP or IEC 60870-5-103
operation. This allows the EnerVista UR Setup software to be used on the port. UR devices operate as Modbus slave
devices only.
For more information on the protocol, including the memory map table, see the UR Series Communications Guide.
— When using the Modbus protocol on the RS232 port, the D30 responds regardless of the
MODBUS SLAVE ADDRESS
programmed. For the RS485 port, each device on the serial bus must have a unique slave address
MODBUS SLAVE ADDRESS
from 1 to 254. Address 0 and addresses from 248 and up are reserved by the Modbus protocol specification, and so their
use here is not recommended. Address 0 is the broadcast address to which all Modbus slave devices listen. When
is set to 0, the D30 accepts broadcast messages, but in compliance with protocol specifications for
SLAVE ADDRESS
broadcast messages, never replies. Addresses do not have to be sequential, but no two devices can have the same
address or conflicts resulting in errors occur. Generally, starting at 1, set each device added to the link to use the next
higher address. When using Modbus TCP/IP, the client must use the programmed
Identifier field.
— Modbus over TCP/IP can also be used on any of the Ethernet ports. The listening TCP port 502
MODBUS TCP PORT NUMBER
is reserved for Modbus communications, and only in exceptional cases when
port. The
MODBUS TCP PORT NUMBER
0 disables Modbus over TCP/IP, meaning closes the Modbus TCP port. When the port number is changed to 0, the change
takes effect when the D30 is restarted. When it is set to 0, use the front panel or serial port to communicate with the relay.
Do not set more than one protocol to the same TCP/UDP port number, as this results in unreliable operation of
those protocols.
NOTE
5.3.4.9 Protocol selection
The menu setting allows selection of one of the following protocols: DNP 3.0, IEC60870-104, or IEC60870-103.
PROTOCOL
For any change to take effect, restart the unit.
The table shows which of DNP 3.0, IEC 60870-5-104, IEC 60870-5-103, and IEC 61850 protocols are operational on the
RS232, RS485, and Ethernet ports. It shows all possible combinations of the
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
setting sets the TCP port used by Modbus on Ethernet. A
MODBUS SLAVE ADDRESS
is set to any other
MODBUS TCP PORT NUMBER
MODBUS TCP PORT NUMBER
and
PROTOCOL DNP CHANNEL 1(2) PORT
PRODUCT SETUP
MODBUS
value in the Unit
of
5
settings.
5-37